医療専門家向け Adult Central Nervous System Tumors Treatment (PDQ®)

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This PDQ cancer information summary for health professionals provides comprehensive, peer-reviewed, evidence-based information about the treatment of adult central nervous system tumors. It is intended as a resource to inform and assist clinicians who care for cancer patients. It does not provide formal guidelines or recommendations for making health care decisions.

This summary is reviewed regularly and updated as necessary by the PDQ Adult Treatment Editorial Board, which is editorially independent of the National Cancer Institute (NCI). The summary reflects an independent review of the literature and does not represent a policy statement of NCI or the National Institutes of Health (NIH).

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General Information About Adult Central Nervous System (CNS) Tumors

Incidence and Mortality

Brain tumors account for 85% to 90% of all primary central nervous system (CNS) tumors.[ 1 ] Estimated new cases and deaths from brain tumors and other nervous system tumors in the United States in 2020:[ 2 ]

Available registry data from the Surveillance, Epidemiology, and End Results (SEER) database for 2011 indicate that the combined incidence of primary invasive CNS tumors in the United States is 6.4 per 100,000 persons per year, with an estimated mortality of 4.3 per 100,000 persons per year.[ 3 ] Worldwide, approximately 256,213 new cases of brain and other CNS tumors were diagnosed in the year 2012, with an estimated 189,382 deaths.[ 4 ]

In general, the incidence of primary CNS tumors is higher in whites than in blacks, and mortality is higher in males than in females.[ 1 ]

Primary brain tumors include the following in decreasing order of frequency:[ 1 ]

Primary spinal tumors include the following in decreasing order of frequency:

Primary brain tumors rarely spread to other areas of the body, but they can spread to other parts of the brain and to the spinal axis.

Anatomy

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Risk Factors

Few definitive observations have been made about environmental or occupational causes of primary CNS tumors.[ 1 ]

The following potential risk factors have been considered:

The familial tumor syndromes and related chromosomal abnormalities that are associated with CNS neoplasms include the following:[ 6 ][ 7 ]

Clinical Features

The clinical presentation of various brain tumors is best appreciated by considering the relationship of signs and symptoms to anatomy.[ 1 ]

General signs and symptoms include the following:

Seizures are a presenting symptom in approximately 20% of patients with supratentorial brain tumors and may antedate the clinical diagnosis by months to years in patients with slow-growing tumors. Among all patients with brain tumors, 70% with primary parenchymal tumors and 40% with metastatic brain tumors develop seizures at some time during the clinical course.[ 8 ]

Diagnostic Evaluation

All brain tumors, whether primary, metastatic, malignant, or benign, must be differentiated from other space-occupying lesions that can have similar clinical presentations, such as abscesses, arteriovenous malformations, and infarctions.[ 9 ]

Imaging tests

Contrast-enhanced computed tomography (CT) and magnetic resonance imaging (MRI) have complementary roles in the diagnosis of CNS neoplasms.[ 1 ][ 9 ][ 10 ]

In posttherapy imaging, single-photon emission computed tomography (SPECT) and positron emission tomography (PET) may be useful in differentiating tumor recurrence from radiation necrosis.[ 9 ]

Biopsy

Biopsy confirmation to corroborate the suspected diagnosis of a primary brain tumor is critical, whether before surgery by needle biopsy or at the time of surgical resection. Cases in which the clinical and radiologic picture clearly point to a benign tumor, which could potentially be managed with active surveillance without biopsy or treatment, are the exception. For other cases, radiologic patterns may be misleading, and a definitive biopsy is needed to rule out other causes of space-occupying lesions, such as metastatic cancer or infection.

CT- or MRI-guided stereotactic techniques can be used to place a needle safely and accurately into almost all locations in the brain.

Prognostic Factors

Several genetic alterations have emerged in recent years as powerful prognostic factors in diffuse glioma (astrocytoma, oligodendroglioma, mixed glioma, and glioblastoma), and these alterations may guide patient management. Specific alterations include the following:

Other prognostic factors that confer poor prognosis include the following:[ 11 ][ 12 ]

In an exploratory analysis of 318 patients with low-grade glioma treated with either radiation therapy alone or temozolomide chemotherapy alone, a combination of these prognostic factors demonstrated the following:[ 11 ]

1. Longer progression-free survival (PFS) in patients with an IDH mutation without codeletion of 1p/19q when treated with radiation therapy (hazard ratio, 1.86; 95% confidence interval, 1.21–2.87; log-rank, P = .0043).
2. No significant treatment-dependent differences in PFS for patients with an IDH mutation with codeletion of 1p/19q and IDH wild-type tumors.
3. Patients with wild-type IDH tumors had the worst prognosis independent of treatment type.
4. Patients with IDH-mutated tumors with codeletion of 1p/19q had the best prognosis.
5. The O6-methylguanine-DNA methyltransferase (MGMT) promoter status in low-grade tumors was methylated in:

(Refer to the Treatment of Primary Central Nervous System Tumors by Tumor Type section of this summary for more information.)

Related Summaries

Refer to the following PDQ summaries for more information:

参考文献

1. Mehta M, Vogelbaum MA, Chang S, et al.: Neoplasms of the central nervous system. In: DeVita VT Jr, Lawrence TS, Rosenberg SA: Cancer: Principles and Practice of Oncology. 9th ed. Philadelphia, Pa: Lippincott Williams & Wilkins, 2011, pp 1700-49.[PUBMED Abstract]
2. American Cancer Society: Cancer Facts and Figures 2020. Atlanta, Ga: American Cancer Society, 2020. Available online. Last accessed January 17, 2020.[PUBMED Abstract]
3. Howlader N, Noone AM, Krapcho M, et al., eds.: SEER Cancer Statistics Review, 1975-2011. Bethesda, Md: National Cancer Institute, 2014. Also available online. Last accessed August 2, 2019.[PUBMED Abstract]
4. Ferlay J, Soerjomataram I, Ervik M, et al.: GLOBOCAN 2012 v1.0, Cancer Incidence and Mortality Worldwide. Lyon, France: International Agency for Research on Cancer, 2013. IARC CancerBase No. 11. Available online. Last accessed October 18, 2019.[PUBMED Abstract]
5. Schabet M: Epidemiology of primary CNS lymphoma. J Neurooncol 43 (3): 199-201, 1999.[PUBMED Abstract]
6. Behin A, Hoang-Xuan K, Carpentier AF, et al.: Primary brain tumours in adults. Lancet 361 (9354): 323-31, 2003.[PUBMED Abstract]
7. Kleihues P, Cavenee WK, eds.: Pathology and Genetics of Tumours of the Nervous System. Lyon, France: International Agency for Research on Cancer, 2000.[PUBMED Abstract]
8. Cloughesy T, Selch MT, Liau L: Brain. In: Haskell CM: Cancer Treatment. 5th ed. Philadelphia, Pa: WB Saunders Co, 2001, pp 1106-42.[PUBMED Abstract]
9. Hutter A, Schwetye KE, Bierhals AJ, et al.: Brain neoplasms: epidemiology, diagnosis, and prospects for cost-effective imaging. Neuroimaging Clin N Am 13 (2): 237-50, x-xi, 2003.[PUBMED Abstract]
10. Ricci PE: Imaging of adult brain tumors. Neuroimaging Clin N Am 9 (4): 651-69, 1999.[PUBMED Abstract]
11. Baumert BG, Hegi ME, van den Bent MJ, et al.: Temozolomide chemotherapy versus radiotherapy in high-risk low-grade glioma (EORTC 22033-26033): a randomised, open-label, phase 3 intergroup study. Lancet Oncol 17 (11): 1521-1532, 2016.[PUBMED Abstract]
12. Reijneveld JC, Taphoorn MJ, Coens C, et al.: Health-related quality of life in patients with high-risk low-grade glioma (EORTC 22033-26033): a randomised, open-label, phase 3 intergroup study. Lancet Oncol 17 (11): 1533-1542, 2016.[PUBMED Abstract]

World Health Organization (WHO) Classification of Adult Primary CNS Tumors

This classification is based on the World Health Organization (WHO) classification of central nervous system (CNS) tumors.[ 1 ] The WHO approach incorporates and interrelates morphology, cytogenetics, molecular genetics, and immunologic markers in an attempt to construct a cellular classification that is universally applicable and prognostically valid. Earlier attempts to develop a TNM-based classification were dropped for the following reasons:[ 2 ]

The WHO grading of CNS tumors establishes a malignancy scale based on histologic features of the tumor.[ 3 ] The histologic grades are as follows:

Table 1 lists the tumor types and grades.[ 4 ] Tumors limited to the peripheral nervous system are not included. Histopathology, grading methods, incidence, and what is known about etiology specific to each tumor type have been described in detail elsewhere.[ 4 ][ 5 ]

Table 1. WHO Grades of CNS Tumors^a

	I	II	III	IV
aReprinted with permission from Louis, DN, Ohgaki H, Wiestler, OD, Cavenee, WK. World Health Organization Classification of Tumours of the Central Nervous System. IARC, Lyon, 2007.
Astrocytic tumors
Subependymal giant cell astrocytoma	X
Pilocytic astrocytoma	X
Pilomyxoid astrocytoma		X
Diffuse astrocytoma		X
Pleomorphic xanthoastrocytoma		X
Anaplastic astrocytoma			X
Glioblastoma				X
Giant cell glioblastoma				X
Gliosarcoma				X
Oligodendroglial tumors
Oligodendroglioma		X
Anaplastic oligodendroglioma			X
Oligoastrocytic tumors
Oligoastrocytoma		X
Anaplastic oligoastrocytoma			X
Ependymal tumors
Subependymoma	X
Myxopapillary ependymoma	X
Ependymoma		X
Anaplastic ependymoma			X
Choroid plexus tumors
Choroid plexus papilloma	X
Atypical choroid plexus papilloma		X
Choroid plexus carcinoma			X
Other neuroepithelial tumors
Angiocentric glioma	X
Chordoid glioma of the third ventricle		X
Neuronal and mixed neuronal-glial tumors
Gangliocytoma	X
Ganglioglioma	X
Anaplastic ganglioma			X
Desmoplastic infantile astrocytoma and ganglioglioma	X
Dysembryoplastic neuroepithelial tumor	X
Central neurocytoma		X
Extraventricular neurocytoma		X
Cerebellar liponeurocytoma		X
Paraganglioma of the spinal cord	X
Papillary glioneuronal tumor	X
Rosette-forming glioneural tumor of the fourth ventricle	X
Pineal tumors
Pineocytoma	X
Pineal parenchymal tumor of intermediate differentiation		X	X
Pineoblastoma				X
Papillary tumor of the pineal region		X	X
Embryonal tumors
Medulloblastoma				X
CNS primitive neuroectodermal tumor				X
Atypical teratoid/rhabdoid tumor				X
Tumors of the cranial and paraspinal nerves
Schwannoma	X
Neurofibroma	X
Perineurioma	X	X	X
Malignant peripheral nerve sheath tumor		X	X	X
Meningeal tumors
Meningioma	X
Atypical meningioma		X
Anaplastic/malignant meningioma			X
Hemangiopericytoma		X
Anaplastic hemangiopericytoma			X
Hemangioblastoma	X
Tumors of the sellar region
Craniopharyngioma	X
Granular cell tumor of the neurohypophysis	X
Pituicytoma	X
Spindle cell oncocytoma of the adenohypophysis	X

Genomic Alterations

Recently discovered alterations in the BRAF and isocitrate dehydrogenase (IDH) 1 and IDH2 genes, and genomic 1p/19q codeletion, appear to be hallmark aberrations in particular glioma subtypes. Assessment for the presence of these mutations aids diagnosis and prognosis and, with regard to 1p/19q codeletion, predicts for response to chemotherapy.

In pilocytic astrocytomas (WHO grade I), tandem duplication at 7q34 leading to a fusion between KIAA1549 and BRAF is found in approximately 70% of pilocytic astrocytomas.[ 6 ][ 7 ][ 8 ] An activating point mutation in BRAF (V600E) is found in an additional 5% to 9% of these tumors and in general, RAF alterations occur in approximately 80% of pilocytic astrocytomas.

BRAF V600E mutations are observed (in about 60%) of other benign glioma variants, including pleomorphic xanthoastrocytoma and ganglioglioma, while BRAF tandem duplications are not found in these variant glioma tumors.[ 9 ][ 10 ][ 11 ]

The majority of WHO grade II and III diffuse gliomas (astrocytomas, oligodendrogliomas, and oligoastrocytomas) and 5% to 10% of glioblastomas (WHO grade IV) harbor point mutations in the R132 position of (IDH1) or, rarely, the analogous codon in IDH2 (R172).[ 12 ][ 13 ][ 14 ][ 15 ][ 16 ] The presence of an IDH1 or IDH2 mutation is a strong prognostic factor. Patients with these mutant tumors have significantly longer survival independent of WHO grade or histologic subtype.

Deletion of chromosomes 1p and 19q occurs through a translocation event [ 17 ] and is common in oligodendrogliomas. 1p/19q codeletion is a powerful prognostic factor and may predict for response to chemotherapy. (Refer to the Anaplastic oligodendrogliomas treatment section of this summary for more information.)

These genetic alterations have potential diagnostic utility. Presence of the IDH1 and IDH2 mutations may distinguish diffuse gliomas from other glioma variants, which often have BRAF genetic alterations, and non-neoplastic reactive astrocytosis.[ 18 ] Most (90%) IDH mutations in gliomas result in an R132H substitution, which can be detected with a highly sensitive and specific monoclonal antibody. A rapid immunohistochemical analysis using the mutant-specific IDH1 antibody can aid diagnostic analysis.[ 19 ]

Other CNS tumors are associated with characteristic patterns of altered oncogenes, altered tumor suppressor genes, and chromosomal abnormalities. Familial tumor syndromes with defined chromosomal abnormalities are associated with gliomas.

参考文献

1. Kleihues P, Cavenee WK, eds.: Pathology and Genetics of Tumours of the Nervous System. Lyon, France: International Agency for Research on Cancer, 2000.[PUBMED Abstract]
2. Brain and Spinal Cord. In: Amin MB, Edge SB, Greene FL, et al., eds.: AJCC Cancer Staging Manual. 8th ed. New York, NY: Springer, 2017, pp. 857–69.[PUBMED Abstract]
3. Kleihues P, Burger PC, Scheithauer BW: The new WHO classification of brain tumours. Brain Pathol 3 (3): 255-68, 1993.[PUBMED Abstract]
4. Louis DN, Ohgaki H, Wiestler OD, et al.: The 2007 WHO classification of tumours of the central nervous system. Acta Neuropathol 114 (2): 97-109, 2007.[PUBMED Abstract]
5. Louis DN, Ohgaki H, Wiestler OD, et al., eds.: WHO Classification of Tumours of the Central Nervous System. 4th ed. Lyon, France: IARC Press, 2007.[PUBMED Abstract]
6. Sievert AJ, Jackson EM, Gai X, et al.: Duplication of 7q34 in pediatric low-grade astrocytomas detected by high-density single-nucleotide polymorphism-based genotype arrays results in a novel BRAF fusion gene. Brain Pathol 19 (3): 449-58, 2009.[PUBMED Abstract]
7. Pfister S, Janzarik WG, Remke M, et al.: BRAF gene duplication constitutes a mechanism of MAPK pathway activation in low-grade astrocytomas. J Clin Invest 118 (5): 1739-49, 2008.[PUBMED Abstract]
8. Jones DT, Kocialkowski S, Liu L, et al.: Tandem duplication producing a novel oncogenic BRAF fusion gene defines the majority of pilocytic astrocytomas. Cancer Res 68 (21): 8673-7, 2008.[PUBMED Abstract]
9. Dias-Santagata D, Lam Q, Vernovsky K, et al.: BRAF V600E mutations are common in pleomorphic xanthoastrocytoma: diagnostic and therapeutic implications. PLoS One 6 (3): e17948, 2011.[PUBMED Abstract]
10. MacConaill LE, Campbell CD, Kehoe SM, et al.: Profiling critical cancer gene mutations in clinical tumor samples. PLoS One 4 (11): e7887, 2009.[PUBMED Abstract]
11. Parsons DW, Jones S, Zhang X, et al.: An integrated genomic analysis of human glioblastoma multiforme. Science 321 (5897): 1807-12, 2008.[PUBMED Abstract]
12. Yan H, Parsons DW, Jin G, et al.: IDH1 and IDH2 mutations in gliomas. N Engl J Med 360 (8): 765-73, 2009.[PUBMED Abstract]
13. Dubbink HJ, Taal W, van Marion R, et al.: IDH1 mutations in low-grade astrocytomas predict survival but not response to temozolomide. Neurology 73 (21): 1792-5, 2009.[PUBMED Abstract]
14. Sanson M, Marie Y, Paris S, et al.: Isocitrate dehydrogenase 1 codon 132 mutation is an important prognostic biomarker in gliomas. J Clin Oncol 27 (25): 4150-4, 2009.[PUBMED Abstract]
15. Hartmann C, Hentschel B, Wick W, et al.: Patients with IDH1 wild type anaplastic astrocytomas exhibit worse prognosis than IDH1-mutated glioblastomas, and IDH1 mutation status accounts for the unfavorable prognostic effect of higher age: implications for classification of gliomas. Acta Neuropathol 120 (6): 707-18, 2010.[PUBMED Abstract]
16. Hartmann C, Meyer J, Balss J, et al.: Type and frequency of IDH1 and IDH2 mutations are related to astrocytic and oligodendroglial differentiation and age: a study of 1,010 diffuse gliomas. Acta Neuropathol 118 (4): 469-74, 2009.[PUBMED Abstract]
17. Jenkins RB, Blair H, Ballman KV, et al.: A t(1;19)(q10;p10) mediates the combined deletions of 1p and 19q and predicts a better prognosis of patients with oligodendroglioma. Cancer Res 66 (20): 9852-61, 2006.[PUBMED Abstract]
18. Camelo-Piragua S, Jansen M, Ganguly A, et al.: A sensitive and specific diagnostic panel to distinguish diffuse astrocytoma from astrocytosis: chromosome 7 gain with mutant isocitrate dehydrogenase 1 and p53. J Neuropathol Exp Neurol 70 (2): 110-5, 2011.[PUBMED Abstract]
19. Capper D, Weissert S, Balss J, et al.: Characterization of R132H mutation-specific IDH1 antibody binding in brain tumors. Brain Pathol 20 (1): 245-54, 2010.[PUBMED Abstract]

Treatment Option Overview for Adult Primary CNS Tumors

Primary CNS Tumors

This section discusses general treatment modalities for primary central nervous system (CNS) tumors. (Refer to the Treatment of Primary Central Nervous System Tumors by Tumor Type section of this summary for a description of specific treatment options for each tumor type.)

Radiation therapy and chemotherapy options vary according to histology and anatomic site of the CNS tumor. For glioblastoma, combined modality therapy with resection, radiation, and chemotherapy is standard. Anaplastic astrocytomas, anaplastic oligodendrogliomas, and anaplastic oligoastrocytomas represent only a small proportion of CNS gliomas; therefore, phase III randomized trials restricted to these tumor types are not generally practical. The natural histories of these tumors are variable, depending on histological and molecular factors; therefore, treatment guidelines are evolving. Therapy involving surgically implanted carmustine-impregnated polymer wafers combined with postoperative external-beam radiation therapy (EBRT) may play a role in the treatment of high-grade (grades III and IV) gliomas in some patients.[ 1 ]

Standard treatment options for primary CNS tumors include the following:

1. Surgery.
2. Radiation therapy.
3. Chemotherapy.
4. Active surveillance.
5. Supportive therapy.

Surgery

For most types of CNS tumors in most locations, complete or near-complete surgical removal is generally attempted, within the constraints of preserving neurologic function and the patient's underlying health. This practice is based on observational evidence that survival is better in patients who undergo tumor resection than in those who have closed biopsy alone.[ 2 ][ 3 ] The benefit of resection has not been tested in randomized trials. Selection bias can enter into observational studies despite attempts to adjust for patient differences that guide the decision to resect the tumor; therefore, the actual difference in outcome between radical surgery and biopsy alone may not be as large as noted in the retrospective studies.[ 3 ]

An exception to the use of resection is the case of deep-seated tumors such as pontine gliomas, which are diagnosed on clinical evidence and treated without initial surgery approximately 50% of the time. In most cases, however, diagnosis by biopsy is preferred. Stereotactic biopsy can be used for lesions that are difficult to reach and resect.

The primary goals of surgical resection include the following:[ 4 ]

Total elimination of primary malignant intraparenchymal tumors by surgery alone is rarely achievable. Therefore, intraoperative techniques have been developed to reach a balance between removing as much tumor as is practical and preserving functional status. For example, craniotomies with stereotactic resections of primary gliomas can be performed in cooperative patients while they are awake, with real-time assessment of neurologic function.[ 5 ] Examples of intraoperative neurologic assessment include the following:

As is the case with several other specialized operations [ 7 ][ 8 ] in which postoperative mortality has been associated with the number of procedures performed, postoperative mortality after surgery for primary brain tumors may be associated with hospital and/or surgeon volume.[ 9 ] Using the Nationwide Inpatient Sample hospital discharge database for the years 1988 to 2000, which represented 20% of inpatient admissions to nonfederal U.S. hospitals, investigators observed the following:[ 9 ]

As with any study of volume-outcome associations, these results may not be causal because of residual confounding factors such as referral patterns, private insurance, and patient selection, despite multivariable adjustment.

Radiation therapy

High-grade tumors

Radiation therapy has a major role in the treatment of patients with high-grade gliomas.

Evidence (postoperative radiation therapy [PORT]):

1. A systematic review and meta-analysis of five randomized trials (plus one trial with allocation by birth date) comparing PORT with no radiation therapy showed a statistically significant survival advantage with radiation (risk ratio, 0.81; 95% CI, 0.74–0.88).[ 10 ][Level of evidence: 1iiA]
2. A randomized trial comparing 60 Gy (in 30 fractions over 6 weeks) with 45 Gy (in 25 fractions over 4 weeks) showed superior survival in the first group (12 months vs. 9 months median survival; hazard ratio [HR], 0.81; 95% CI, 0.66–0.99). The accepted standard dose of EBRT for malignant gliomas is 60 Gy.[ 11 ][Level of evidence: 1iiA]

EBRT using either 3-dimensional conformal radiation therapy (3D-CRT) or intensity-modulated radiation therapy (IMRT) is considered an acceptable technique in radiation therapy delivery. Typically used are 2- to 3-cm margins on the MRI-based volumes (T1-weighted and fluid-attenuated inversion recovery [FLAIR]) to create the planning target volume.

Dose escalation using radiosurgery has not improved outcomes. A randomized trial tested radiosurgery as a boost added to standard EBRT, but the trial found no improvement in survival, quality of life, or patterns of relapse compared with EBRT without the boost.[ 12 ][ 13 ]

Brachytherapy has been used to deliver high doses of radiation locally to the tumor while sparing normal brain tissue. However, this approach is technically demanding and has fallen out of favor with the advent of 3D-CRT and IMRT.

Low-grade tumors

Treatment options for patients with low-grade gliomas (i.e., low-grade astrocytomas, oligodendrogliomas, and mixed oligoastrocytomas) are not as clear as in the case of high-grade tumors and include observation, PORT, and chemotherapy with temozolomide.

Evidence (PORT versus observation):

1. The European Organisation for Research and Treatment of Cancer (EORTC) randomly assigned 311 patients with low-grade gliomas to undergo either radiation or observation in the EORTC-22845 (MRC BR04) trial.[ 14 ][ 15 ] On review of central pathology, about 25% of patients in the trial were reported to have high-grade tumors. Most of the control patients received radiation therapy at the time of progression.

Evidence (PORT versus temozolomide for patients with low-grade World Health Organization (WHO) grade II tumors with at least one high-risk feature):

1. The EORTC 22033-26033 [NCT00182819] trial randomly assigned 707 patients with low-grade glioma (WHO grade II astrocytoma, oligoastrocytoma, or oligodendroglioma) and at least one high-risk feature (age >40 years, progressive disease, tumor size >5 cm, tumor crossing the midline, or neurological symptoms) to receive either radiation therapy (n = 240) or temozolomide chemotherapy (n = 237). Radiation therapy consisted of conformal treatment (up to 50.4 Gy; 28 doses of 1.8 Gy daily, 5 days a week, for up to 6.5 weeks). Chemotherapy was dose-dense oral temozolomide (75 mg/m² daily for 21 days, repeated every 28 days [one cycle], for a maximum of 12 cycles).[ 16 ][ 17 ]
   1. There was no significant difference in PFS (primary endpoint) or health-related quality of life (HR-QOL) (secondary endpoint).
   2. At a median follow-up of 48 months (intraquartile range [IQR], 31–56), median PFS was 39 months (95% CI, 35–44) in the temozolomide group and 46 months (95% CI, 40–56) in the radiation therapy group (unadjusted HR, 1.16; 95% CI, 0.9–1.5; P = .22).[ 16 ][Level of evidence: 1iiDiii]
   3. An exploratory analysis of 318 molecularly defined patients found that patients with an isocitrate dehydrogenase (IDH gene) mutation without codeletion of 1p/19q displayed a significantly longer PFS when treated with radiation therapy (HR, 1.86; 95% CI, 1.21–2.87; log-rank, P = .0043).
   4. There were no significant treatment-dependent differences in PFS for patients with IDH mutation with codeletion of 1p/19q and IDH wild-type tumors.
   5. Patients with wild-type IDH tumors had the worst prognosis independent of treatment type.
   6. Patients with IDH-mutated tumors with codeletion of 1p/19q had the best prognosis.
   7. The O6-methylguanine-DNA methyltransferase (MGMT) promoter status was methylated in:

Disease progression, subsequent neoplasms, or recurrences

There are no randomized trials to delineate the role of repeat radiation after disease progression or the development of radiation-induced cancers. The literature is limited to small retrospective case series, which makes interpretation difficult.[ 18 ] The decision to repeat radiation must be made carefully because of the risk of neurocognitive deficits and radiation-induced necrosis. One advantage of radiosurgery is the ability to deliver therapeutic doses to recurrent tumors that may require the re-irradiation of previously irradiated brain tissue beyond tolerable dose limits.

Chemotherapy

Systemic chemotherapy

For many years, the nitrosourea carmustine ([bis-chloroethylnitrosourea] BCNU) was the standard chemotherapy agent added to surgery and radiation therapy for malignant gliomas, based on the Radiation Therapy Oncology Group's (RTOG's) randomized trial (RTOG-8302).[ 19 ][Level of evidence: 1iiA] A modest impact on survival with the use of nitrosourea-containing chemotherapy regimens for malignant gliomas was confirmed in a patient-level meta-analysis of 12 randomized trials (combined HR_death, 0.85; 95% CI, 0.78–0.91).[ 20 ]

A large multicenter trial (NCT00006353) of glioblastoma patients conducted by the EORTC-National Cancer Institute of Canada reported a survival advantage with the use of temozolomide in addition to radiation therapy.[ 21 ][ 22 ][Level of evidence: 1iiA] On the basis of these results, the oral agent temozolomide has replaced BCNU as the standard systemic chemotherapy for malignant gliomas. (Refer to the Glioblastomas treatment section of this summary for more information.)

Long-term results of randomized trials in high-risk, low-grade (WHO grade II) gliomas [ 23 ][Level of evidence: 1iiA] and anaplastic (WHO grade III) oligodendroglial tumors [ 24 ][ 25 ][Level of evidence: 1iiA] have demonstrated that the addition of procarbazine, lomustine (CCNU), and vincristine (PCV) chemotherapy to radiation therapy after surgery extends survival. Radiation and PCV chemotherapy should be considered for patients deemed appropriate for therapy. (Refer to the Treatment of Primary Central Nervous System Tumors by Tumor Type section of this summary for more information.)

Localized chemotherapy (carmustine wafer)

The concept of delivering high doses of chemotherapy while avoiding systemic toxicity is attractive because malignant glioma–related deaths are nearly always the result of an inability to control intracranial disease rather than the result of distant metastases. A biodegradable carmustine wafer has been developed for that purpose. The wafers contain 3.85% carmustine, and up to eight wafers are implanted into the tumor bed lining at the time of open resection, with an intended total dose of about 7.7 mg per wafer (61.6 mg maximum per patient) over a period of 2 to 3 weeks.

Two randomized, placebo-controlled trials of this focal drug-delivery method have shown an OS advantage associated with the carmustine wafers versus radiation therapy alone. In both trials, the upper age limit for patients was 65 years.

Evidence (carmustine wafer):

1. A small trial was closed because of a lack of continued availability of the carmustine wafers after 32 patients with high-grade gliomas had been entered.[ 26 ]
2. A multicenter study of 240 patients with primary malignant gliomas, 207 of whom had glioblastoma, was more informative.[ 27 ][ 28 ] At initial surgery, patients received either carmustine wafers or placebo wafers, followed by radiation therapy (55–60 Gy). Systemic therapy was not allowed until recurrence, except in the case of anaplastic oligodendrogliomas (n = 9). Unlike the initial trial, patient characteristics were well balanced between the study arms.
3. A systematic review combining both studies [ 26 ][ 27 ][ 28 ] estimated an HR for overall mortality of 0.65; 95% CI, 0.48–0.86; P = .003.[ 29 ][Level of evidence: 1iA]

Active surveillance

Active surveillance is appropriate in some circumstances. With the increasing use of sensitive neuroimaging tools, detection of asymptomatic low-grade meningiomas has increased; most appear to show minimal growth and can often be safely observed, with therapy deferred until the detection of tumor growth or the development of symptoms.[ 30 ][ 31 ]

Supportive therapy

Dexamethasone, mannitol, and furosemide are used to treat the peritumoral edema associated with brain tumors. The use of anticonvulsants is mandatory for patients with seizures.[ 4 ]

参考文献

1. Lallana EC, Abrey LE: Update on the therapeutic approaches to brain tumors. Expert Rev Anticancer Ther 3 (5): 655-70, 2003.[PUBMED Abstract]
2. Laws ER, Parney IF, Huang W, et al.: Survival following surgery and prognostic factors for recently diagnosed malignant glioma: data from the Glioma Outcomes Project. J Neurosurg 99 (3): 467-73, 2003.[PUBMED Abstract]
3. Chang SM, Parney IF, Huang W, et al.: Patterns of care for adults with newly diagnosed malignant glioma. JAMA 293 (5): 557-64, 2005.[PUBMED Abstract]
4. Cloughesy T, Selch MT, Liau L: Brain. In: Haskell CM: Cancer Treatment. 5th ed. Philadelphia, Pa: WB Saunders Co, 2001, pp 1106-42.[PUBMED Abstract]
5. Meyer FB, Bates LM, Goerss SJ, et al.: Awake craniotomy for aggressive resection of primary gliomas located in eloquent brain. Mayo Clin Proc 76 (7): 677-87, 2001.[PUBMED Abstract]
6. Sanai N, Mirzadeh Z, Berger MS: Functional outcome after language mapping for glioma resection. N Engl J Med 358 (1): 18-27, 2008.[PUBMED Abstract]
7. Begg CB, Cramer LD, Hoskins WJ, et al.: Impact of hospital volume on operative mortality for major cancer surgery. JAMA 280 (20): 1747-51, 1998.[PUBMED Abstract]
8. Birkmeyer JD, Finlayson EV, Birkmeyer CM: Volume standards for high-risk surgical procedures: potential benefits of the Leapfrog initiative. Surgery 130 (3): 415-22, 2001.[PUBMED Abstract]
9. Barker FG, Curry WT, Carter BS: Surgery for primary supratentorial brain tumors in the United States, 1988 to 2000: the effect of provider caseload and centralization of care. Neuro Oncol 7 (1): 49-63, 2005.[PUBMED Abstract]
10. Laperriere N, Zuraw L, Cairncross G, et al.: Radiotherapy for newly diagnosed malignant glioma in adults: a systematic review. Radiother Oncol 64 (3): 259-73, 2002.[PUBMED Abstract]
11. Bleehen NM, Stenning SP: A Medical Research Council trial of two radiotherapy doses in the treatment of grades 3 and 4 astrocytoma. The Medical Research Council Brain Tumour Working Party. Br J Cancer 64 (4): 769-74, 1991.[PUBMED Abstract]
12. Tsao MN, Mehta MP, Whelan TJ, et al.: The American Society for Therapeutic Radiology and Oncology (ASTRO) evidence-based review of the role of radiosurgery for malignant glioma. Int J Radiat Oncol Biol Phys 63 (1): 47-55, 2005.[PUBMED Abstract]
13. Souhami L, Seiferheld W, Brachman D, et al.: Randomized comparison of stereotactic radiosurgery followed by conventional radiotherapy with carmustine to conventional radiotherapy with carmustine for patients with glioblastoma multiforme: report of Radiation Therapy Oncology Group 93-05 protocol. Int J Radiat Oncol Biol Phys 60 (3): 853-60, 2004.[PUBMED Abstract]
14. Karim AB, Afra D, Cornu P, et al.: Randomized trial on the efficacy of radiotherapy for cerebral low-grade glioma in the adult: European Organization for Research and Treatment of Cancer Study 22845 with the Medical Research Council study BRO4: an interim analysis. Int J Radiat Oncol Biol Phys 52 (2): 316-24, 2002.[PUBMED Abstract]
15. van den Bent MJ, Afra D, de Witte O, et al.: Long-term efficacy of early versus delayed radiotherapy for low-grade astrocytoma and oligodendroglioma in adults: the EORTC 22845 randomised trial. Lancet 366 (9490): 985-90, 2005.[PUBMED Abstract]
16. Baumert BG, Hegi ME, van den Bent MJ, et al.: Temozolomide chemotherapy versus radiotherapy in high-risk low-grade glioma (EORTC 22033-26033): a randomised, open-label, phase 3 intergroup study. Lancet Oncol 17 (11): 1521-1532, 2016.[PUBMED Abstract]
17. Reijneveld JC, Taphoorn MJ, Coens C, et al.: Health-related quality of life in patients with high-risk low-grade glioma (EORTC 22033-26033): a randomised, open-label, phase 3 intergroup study. Lancet Oncol 17 (11): 1533-1542, 2016.[PUBMED Abstract]
18. Paulino AC, Mai WY, Chintagumpala M, et al.: Radiation-induced malignant gliomas: is there a role for reirradiation? Int J Radiat Oncol Biol Phys 71 (5): 1381-7, 2008.[PUBMED Abstract]
19. Walker MD, Green SB, Byar DP, et al.: Randomized comparisons of radiotherapy and nitrosoureas for the treatment of malignant glioma after surgery. N Engl J Med 303 (23): 1323-9, 1980.[PUBMED Abstract]
20. Stewart LA: Chemotherapy in adult high-grade glioma: a systematic review and meta-analysis of individual patient data from 12 randomised trials. Lancet 359 (9311): 1011-8, 2002.[PUBMED Abstract]
21. Stupp R, Mason WP, van den Bent MJ, et al.: Radiotherapy plus concomitant and adjuvant temozolomide for glioblastoma. N Engl J Med 352 (10): 987-96, 2005.[PUBMED Abstract]
22. Stupp R, Hegi ME, Mason WP, et al.: Effects of radiotherapy with concomitant and adjuvant temozolomide versus radiotherapy alone on survival in glioblastoma in a randomised phase III study: 5-year analysis of the EORTC-NCIC trial. Lancet Oncol 10 (5): 459-66, 2009.[PUBMED Abstract]
23. Buckner JC, Pugh SL, Shaw EG, et al.: Phase III study of radiation therapy with or without procarbazine, CCNU, and vincristine (PCV) in low-grade glioma: RTOG 9802 with Alliance, ECOG, and SWOG. [Abstract] J Clin Oncol 32 (Suppl 5): A-2000, 2014.[PUBMED Abstract]
24. van den Bent MJ, Brandes AA, Taphoorn MJ, et al.: Adjuvant procarbazine, lomustine, and vincristine chemotherapy in newly diagnosed anaplastic oligodendroglioma: long-term follow-up of EORTC brain tumor group study 26951. J Clin Oncol 31 (3): 344-50, 2013.[PUBMED Abstract]
25. Cairncross G, Wang M, Shaw E, et al.: Phase III trial of chemoradiotherapy for anaplastic oligodendroglioma: long-term results of RTOG 9402. J Clin Oncol 31 (3): 337-43, 2013.[PUBMED Abstract]
26. Valtonen S, Timonen U, Toivanen P, et al.: Interstitial chemotherapy with carmustine-loaded polymers for high-grade gliomas: a randomized double-blind study. Neurosurgery 41 (1): 44-8; discussion 48-9, 1997.[PUBMED Abstract]
27. Westphal M, Hilt DC, Bortey E, et al.: A phase 3 trial of local chemotherapy with biodegradable carmustine (BCNU) wafers (Gliadel wafers) in patients with primary malignant glioma. Neuro-oncol 5 (2): 79-88, 2003.[PUBMED Abstract]
28. Westphal M, Ram Z, Riddle V, et al.: Gliadel wafer in initial surgery for malignant glioma: long-term follow-up of a multicenter controlled trial. Acta Neurochir (Wien) 148 (3): 269-75; discussion 275, 2006.[PUBMED Abstract]
29. Hart MG, Grant R, Garside R, et al.: Chemotherapeutic wafers for high grade glioma. Cochrane Database Syst Rev (3): CD007294, 2008.[PUBMED Abstract]
30. Nakamura M, Roser F, Michel J, et al.: The natural history of incidental meningiomas. Neurosurgery 53 (1): 62-70; discussion 70-1, 2003.[PUBMED Abstract]
31. Yano S, Kuratsu J; Kumamoto Brain Tumor Research Group: Indications for surgery in patients with asymptomatic meningiomas based on an extensive experience. J Neurosurg 105 (4): 538-43, 2006.[PUBMED Abstract]

Treatment of Primary Central Nervous System Tumors by Tumor Type

Table 2. Treatment of Primary Central Nervous System Tumors by Tumor Type

Tumor Type	Standard Treatment Options
Astrocytic tumors
—Brain stem gliomas	Radiation therapy
—Pineal astrocytic tumors	Surgery plus radiation therapy
	Surgery plus radiation therapy and chemotherapy for higher-grade tumors
—Pilocytic astrocytomas	Surgery alone
	Surgery followed by radiation therapy
—Diffuse astrocytomas (WHO grade II)	Surgery with or without radiation therapy
	Surgery followed by radiation therapy and chemotherapy
—Anaplastic astrocytomas (WHO grade III)	Surgery plus radiation therapy with or without chemotherapy
	Surgery plus chemotherapy
—Glioblastomas	Surgery plus radiation therapy and chemotherapy
	Surgery plus radiation therapy
	Carmustine-impregnated polymer implant
	Radiation therapy and concurrent chemotherapy
Oligodendroglial tumors
—Oligodendrogliomas	Surgery with or without radiation therapy
	Surgery with radiation therapy and chemotherapy
—Anaplastic oligodendrogliomas	Surgery plus radiation therapy with or without chemotherapy
Mixed gliomas	Surgery plus radiation therapy with or without chemotherapy
Ependymal tumors
—Grades I and II ependymal tumors	Surgery alone
	Surgery followed by radiation therapy
—Anaplastic ependymoma	Surgery plus radiation therapy
Embryonal cell tumors
—Medulloblastomas	Surgery plus craniospinal radiation therapy
Pineal parenchymal tumors	Surgery plus radiation therapy (for pineocytoma)
	Surgery plus radiation therapy and chemotherapy (for pineoblastoma)
Meningeal tumors
—Grade I meningiomas	Active surveillance with deferred treatment
	Surgery
	Stereotactic radiosurgery
	Surgery plus radiation therapy
	Fractionated radiation therapy
—Grades II and III meningiomas and hemangiopericytomas	Surgery plus radiation therapy
Germ cell tumors	Depends on multiple factors
Tumors of the sellar region
—Craniopharyngiomas	Surgery alone
	Debulking surgery plus radiation therapy

Astrocytic Tumors Treatment

Brain stem gliomas treatment

Patients with brain stem gliomas have relatively poor prognoses that correlate with histology (when biopsies are performed), location, and extent of tumor. The overall median survival time of patients in studies has been 44 to 74 weeks.

Standard treatment options for brain stem gliomas include the following:

1. Radiation therapy.

Pineal astrocytic tumors treatment

Depending on the degree of anaplasia, patients with pineal astrocytomas have variable prognoses. Patients with higher-grade tumors have worse prognoses.

Standard treatment options for pineal astrocytic tumors include the following:

1. Surgery plus radiation therapy for pineal astrocytoma.
2. Surgery plus radiation therapy and chemotherapy for higher-grade tumors.

Pilocytic astrocytomas treatment

This astrocytic tumor is classified as a World Health Organization (WHO) grade I tumor and is often curable.

Standard treatment options for pilocytic astrocytomas include the following:

1. Surgery alone if the tumor is totally resectable.
2. Surgery followed by radiation therapy to known or suspected residual tumor.

Diffuse astrocytomas treatment

This WHO grade II astrocytic tumor is less often curable than is a pilocytic astrocytoma.

Standard treatment options for diffuse astrocytomas (WHO grade II) include the following:

1. Surgery with or without radiation therapy.
2. Surgery followed by radiation therapy and chemotherapy.

Controversy exists about the timing of radiation therapy after surgery. (Refer to Low-grade tumors in the Radiation therapy section of the Treatment Option Overview for Adult Central Nervous System Tumors Treatment section in this summary for more information.)

Some physicians use surgery alone if a patient has clinical factors that are considered low risk, such as age less than 40 years and the lack of contrast enhancement on a computed tomographic scan.[ 2 ]

Evidence (surgery followed by radiation therapy and chemotherapy):

1. For patients with low-grade (WHO grade II) tumors, which are considered high risk, radiation therapy followed by six cycles of vincristine (PCV) chemotherapy is a recommended option based on the long-term follow-up results of the Radiation Therapy Oncology Group's (RTOG's) 1986-initiated randomized trial (RTOG 9802 [NCT00003375]).[ 3 ][Level of evidence: 1iiA] In this trial, high-risk, low-grade glioma patients, defined as patients aged 18 to 39 years with biopsy or subtotal resection, or patients aged 40 years or older, were randomly assigned to either 54 Gy of radiation therapy or radiation therapy followed by six cycles of PCV chemotherapy.
   1. The addition of PCV to radiation therapy increased median PFS from 4.0 years to 10.4 years (P = .002; hazard ratio [HR], 0.50) and median OS from 7.8 years to 13.3 years (P = .03; HR, 0.59).
   2. Notably, the RTOG 9802 study enrolled patients with a variety of tumors, including astrocytomas, oligodendrogliomas, and mixed oligoastrocytomas.

The discovery of the isocitrate dehydrogenase (IDH) 1 and IDH2 mutations in diffuse gliomas has greatly helped to identify patients who are considered high risk. A number of large, retrospective studies has demonstrated that the IDH1 and IDH2 mutation is a powerful independent prognostic factor for improved survival.[ 5 ][ 6 ][ 7 ][ 8 ][ 9 ] The majority of WHO grade II and III gliomas harbor the IDH1 and IDH2 mutation,[ 6 ][ 10 ][ 11 ] and, therefore, the presence of the IDH1 and IDH2 mutation should be included in the assessment of high risk. Molecular correlative data from the RTOG 98-02 trial, which would be informative about which patients benefited the most from the addition of PCV, have not yet been reported.

Anaplastic astrocytomas treatment

Patients with anaplastic astrocytomas (WHO grade III) have a low cure rate with standard local treatment.

Standard treatment options for anaplastic astrocytomas include the following:

1. Surgery plus radiation therapy with or without chemotherapy.
2. Surgery plus chemotherapy.

A subset of anaplastic astrocytomas is aggressive; these tumors are frequently managed in the same way as glioblastomas, with surgery and radiation, and often with chemotherapy. However, the optimal treatment for these tumors is not established. Two phase III randomized trials restricted to patients with anaplastic gliomas (NCT00626990 and NCT00887146) are currently enrolling patients, but efficacy data are not available. It is not known whether the improved survival of patients with chemotherapy-treated glioblastoma can be extrapolated to patients with anaplastic astrocytomas.

The IDH1 and IDH2 mutation is present in 50% to 70% of anaplastic astrocytomas and is independently associated with significantly improved survival.[ 6 ][ 9 ] Assessment of the IDH1 and IDH2 mutation status may guide decisions about treatment options.

Evidence (surgery plus radiation therapy or chemotherapy):

1. Postoperative radiation alone has been compared with postoperative chemotherapy alone in patients with anaplastic gliomas (i.e., 144 astrocytomas, 91 oligoastrocytomas, and 39 oligodendrogliomas), with crossover to the other modality at the time of tumor progression. Of the 139 patients randomly assigned to undergo radiation therapy, 135 were randomly assigned to receive chemotherapy, with a 32-week course of either PCV or single-agent temozolomide (2:1:1 randomization).[ 12 ][Levels of evidence: 1iiA and 1iiD]

Patients with anaplastic astrocytomas are appropriate candidates for clinical trials designed to improve local control by adding newer forms of treatment to standard treatment. Information about ongoing clinical trials is available from the NCI website.

Glioblastomas treatment

For patients with glioblastoma (WHO grade IV), the cure rate is very low with standard local treatment.

Methylation of the promoter of the O6-methylguanine-DNA methyltransferase (MGMT) DNA repair enzyme gene is an independent prognostic factor for improved survival in newly diagnosed glioblastoma.[ 13 ][ 14 ] MGMT promoter methylation and concomitant inactivation of the DNA repair enzyme activities may also predict for response to temozolomide chemotherapy.[ 13 ] However, the clinical data that MGMT promoter methylation is a predictive marker is less certain. (Refer to Glioblastomas treatment in the Astrocytic Tumors Treatment section of the Treatment of Primary Central Nervous System Tumors by Tumor Type section of this summary for more information about the RTOG-0525 [NCT00304031] trial.)

Standard treatment options for patients with newly diagnosed glioblastoma include the following:

1. Surgery plus radiation therapy and chemotherapy.
2. Surgery plus radiation therapy.
3. Carmustine-impregnated polymer implanted during initial surgery.
4. Radiation therapy and concurrent chemotherapy.

The standard treatment for patients with newly diagnosed glioblastoma is surgery followed by concurrent radiation therapy and daily temozolomide, and then followed by six cycles of temozolomide. The addition of bevacizumab to radiation therapy and temozolomide did not improve OS.

Evidence (Surgery plus radiation therapy and chemotherapy):

1. Standard therapy is based on a large, multicenter, randomized trial (NCT00006353) conducted by the EORTC and National Cancer Institute of Canada (NCIC).This trial reported a survival benefit with concurrent radiation therapy and temozolomide, compared with radiation therapy alone.[ 15 ][ 16 ][Level of evidence: 1iiA] In this study, 573 patients with glioblastoma were randomly assigned to receive standard radiation to the tumor volume with a 2- to 3-cm margin (60 Gy, 2 Gy per fraction, over 6 weeks) alone or with temozolomide (75 mg/m² orally per day during radiation therapy for up to 49 days, followed by a 4-week break and then up to six cycles of five daily doses every 28 days at a dose of 150 mg/m², increasing to 200 mg/m² after the first cycle).
   1. OS was statistically significantly better in the combined radiation therapy–temozolomide group (HR_death, 0.6; 95% confidence interval [CI], 0.5–0.7; OS at 3 years was 16.0% for the radiation therapy–temozolomide group vs. 4.4% radiation therapy–alone group).
   2. A companion molecular correlation subset study to the EORTC-NCIC trial provided strong evidence that epigenetic silencing of the MGMT DNA-repair gene by promoter DNA methylation was associated with increased OS in patients with newly diagnosed glioblastoma.[ 13 ]
2. To test whether protracted (dose-dense) temozolomide enhances treatment response in patients with newly diagnosed glioblastoma, a multicenter, randomized, phase III trial conducted by the RTOG, EORTC, and the North Central Cancer Therapy Group, RTOG 0525 (NCT00304031), compared standard adjuvant temozolomide treatment (days 1–5 of a 28-day cycle) with a dose-dense schedule (days 1–21 of a 28-day cycle). All patients were treated with surgery followed by radiation therapy and concurrent daily temozolomide. Patients were then randomly assigned to receive either standard adjuvant temozolomide or dose-dense temozolomide.[ 14 ][Level of evidence: 1iiA]

Evidence (surgery and chemoradiation with or without bevacizumab):

In 2013, final data from two multicenter, phase III, randomized, double-blind, placebo-controlled trials of bevacizumab in patients who had newly diagnosed glioblastoma were reported: RTOG 0825 (NCT00884741) and the Roche-sponsored AVAglio (NCT00943826).[ 17 ][ 18 ][Level of evidence: 1iA] Bevacizumab did not improve OS in either trial.

There was significant crossover in both trials. Approximately 40% of RTOG 0825 patients and approximately 30% of AVAglio patients received bevacizumab at the first sign of disease progression.

1. RTOG 0825 (NCT00884741): Patients were randomly assigned to receive standard therapy (chemoradiation with temozolomide) or standard therapy plus bevacizumab. OS and PFS were coprimary endpoints.[ 17 ][Level of evidence: 1iA]
2. AVAglio (NCT00943826): Patients were randomly assigned to receive standard therapy (chemoradiation with temozolomide) or standard therapy plus bevacizumab. OS and PFS were coprimary endpoints.[ 18 ][Level of evidence: 1iA]

The two trials had contradictory results in health-related quality of life (HRQoL) and neurocognitive outcomes studies. In the mandatory HRQoL studies in the AVAglio trial, bevacizumab-treated patients experienced improved HRQoL, but bevacizumab-treated patients in the elective RTOG 0825 studies showed more decline in patient-reported HRQoL and neurocognitive function. The reasons for these discrepancies are unclear.

On the basis of these results, there is no definite evidence that the addition of bevacizumab to standard therapy is beneficial for all newly diagnosed glioblastoma patients. Certain subgroups may benefit from the addition of bevacizumab, but this is not yet known.

Glioblastoma patients are appropriate candidates for clinical trials designed to improve local control by adding newer forms of treatment to standard treatment. Information about ongoing clinical trials is available from the NCI website.

Oligodendroglial Tumors Treatment

Oligodendrogliomas treatment

Patients who have oligodendrogliomas (WHO grade II) generally have better prognoses than do patients who have diffuse astrocytomas. In particular, patients who have oligodendrogliomas with 1p/19q codeletion have a much longer survival.[ 3 ] Most of the oligodendrogliomas eventually progress.

Standard treatment options for oligodendrogliomas include the following:

1. Surgery with or without radiation therapy.
2. Surgery with radiation therapy and chemotherapy.

Controversy exists concerning the timing of radiation therapy after surgery. A study (EORTC-22845) of 300 patients with low-grade gliomas who had surgery and were randomly assigned to either radiation therapy or watchful waiting, did not show a difference in OS between the two groups.[ 1 ][Level of evidence: 1iiA] (Refer to Low-grade tumors in the Radiation Therapy section of the Treatment Option Overview for Adult Central Nervous System Tumors Treatment section of this summary for more information.)

For low-grade (WHO grade II) tumors that are considered high risk, radiation therapy followed by six cycles of PCV chemotherapy is a recommended option based on the long-term follow-up results of RTOG-9802, a randomized trial for high-risk, low-grade gliomas.[ 3 ][Level of evidence: 1iiA] (Refer to Diffuse astrocytomas treatment in the Astrocytic Tumors Treatment section of the Treatment of Primary Central Nervous System Tumors by Tumor Type section of this summary for more information.)

Notably, the RTOG-9802 study enrolled patients with a mixed variety of tumors, including astrocytomas, oligodendrogliomas, and mixed oligoastrocytomas; in a retrospective subset analysis, only the oligodendroglial tumors appeared to benefit from the addition of PCV.[ 4 ] (Refer to Diffuse astrocytomas treatment in the Astrocytic Tumors Treatment section of the Treatment of Primary Central Nervous System Tumors by Tumor Type section of this summary for more information.)

The discovery of the IDH1 and IDH2 mutations, which are independent prognostic factors for significantly improved survival in diffuse gliomas, has greatly helped to identify patients who are considered high risk. (Refer to Diffuse astrocytomas treatment in the Astrocytic Tumors Treatment section of the Treatment of Primary Central Nervous System Tumors by Tumor Type section of this summary for more information.) In addition, a high proportion of WHO grade II oligodendrogliomas have 1p/19q codeletion, which is a powerful prognostic factor for improved survival.[ 19 ][ 20 ][ 21 ] Therefore, the presence of the IDH1 and IDH2 mutation and 1p/19q codeletion should be included in the assessment of high-risk patients. Molecular correlative data from the RTOG-9802 trial, which would be informative about which patients benefited most from the addition of PCV, have not yet been reported.

Anaplastic oligodendrogliomas treatment

Patients with anaplastic oligodendrogliomas (WHO grade III) have a low cure rate with standard local treatment, but their prognoses are generally better than are the prognoses of patients with anaplastic astrocytomas. Prognoses are particularly better for patients with 1p/19q codeletion, which occurs in a majority of these tumors. Two phase III randomized trials restricted to patients with anaplastic gliomas (NCT00626990 and NCT00887146) are currently enrolling patients; however, efficacy data are not yet available. (Refer to Anaplastic astrocytomas treatment in the Astrocytic Tumors Treatment section of the Treatment of Primary Central Nervous System Tumors by Tumor Type section of this summary for more information.) These patients are appropriate candidates for clinical trials designed to improve local control by adding newer forms of treatment.

Information about ongoing clinical trials is available from the NCI website.

Standard treatment options for anaplastic oligodendrogliomas include the following:

1. Surgery plus radiation with or without chemotherapy.[ 22 ]

Evidence (surgery followed by radiation therapy with or without chemotherapy):

1. Mature results from the EORTC Brain Tumor Group Study 26951 (NCT00002840), a phase III, randomized study with 11.7 years of follow-up, demonstrated increased OS and PFS in patients with anaplastic oligodendroglial tumors with six cycles of adjuvant PCV chemotherapy after radiation therapy, compared with radiation therapy alone.[ 23 ][Level of evidence: 1iiA]
2. In contrast, the RTOG trial (RTOG-9402 [NCT00002569]) demonstrated no differences in median survival by treatment arm between an 8-week, intensive PCV chemotherapy regimen followed by immediate involved-field-plus-radiation therapy and radiation therapy alone.[ 24 ]
3. Postoperative radiation therapy alone has been compared with postoperative chemotherapy alone in patients with anaplastic gliomas (including 144 astrocytomas, 91 oligoastrocytomas, and 39 oligodendrogliomas) with crossover to the other modality at the time of tumor progression. Of the 139 patients randomly assigned to undergo radiation therapy, 135 were randomly assigned to receive chemotherapy, with a 32-week course of either PCV or single-agent temozolomide (2:1:1 randomization).[ 12 ][Levels of evidence: 1iiA and 1iiD].

On the basis of these data, CODEL (NCT00887146), a study that randomly assigned patients to receive radiation therapy alone (control arm), radiation therapy with temozolomide, and temozolomide alone (exploratory arm), was halted because radiation therapy alone was no longer considered adequate treatment in patients with anaplastic oligodendroglioma with 1p/19q-codeletions.[ 25 ] Temozolomide and PCV chemotherapy in anaplastic oligodendroglioma have not been compared, although in the setting of grade 3 anaplastic gliomas, no survival difference was seen between PCV chemotherapy and temozolomide.[ 12 ][ 26 ]

The combination of radiation and chemotherapy is not known to be superior in outcome to sequential modality therapy.

A high proportion of anaplastic oligodendrogliomas have the IDH1 andIDH2 mutation and 1p/19q codeletion, both powerful prognostic factors for improved survival. (Refer to Diffuse astrocytomas treatment in the Astrocytic Tumors Treatment section of the Treatment of Primary Central Nervous System Tumors by Tumor Type of this summary for more information.)[ 23 ][ 24 ] In addition, PCV chemotherapy has been shown to be predictive in a retrospective analysis of the phase III trials described earlier. Therefore, assessment of these molecular markers may aid management decisions for anaplastic oligodendrogliomas.

Mixed Gliomas Treatment

Patients with mixed glial tumors, which include oligoastrocytoma (WHO grade II) and anaplastic oligoastrocytoma (WHO grade III), have highly variable prognoses based upon their status of the IDH1 and IDH2 genes and 1p/19q chromosomes.[ 27 ][ 28 ][ 29 ] Therefore, the optimal treatment for these tumors as a group is uncertain. Often, they are treated similarly to astrocytic tumors because a subset of tumors may have outcomes similar to WHO grade III astrocytic or WHO grade IV glioblastoma tumors. Testing for these known, strong, prognostic molecular markers should be performed, which may help to guide the assessment of risk and subsequent management.

Standard treatment options for mixed gliomas include the following:

1. Surgery plus radiation therapy with or without chemotherapy.

(Refer to the Astrocytic Tumors section in the Treatment of Primary Central Nervous System Tumors by Tumor Type section of this summary for more information about astrocytic tumors.)

Ependymal Tumors Treatment

Ependymal tumors (WHO grade I) and ependymomas (WHO grade II)—i.e., subependymomas and myxopapillary ependymomas—are often curable.

Standard treatment options for grades I and II ependymal tumors include the following:

1. Surgery alone if the tumor is totally resectable.
2. Surgery followed by radiation therapy to known or suspected residual tumor.

Patients with anaplastic ependymomas (WHO grade III) have variable prognoses that depend on the location and extent of disease. Frequently, but not invariably, patients with anaplastic ependymomas have worse prognoses than do those patients with lower-grade ependymal tumors.

Standard treatment options for anaplastic ependymomas include the following:

1. Surgery plus radiation therapy.[ 30 ]

Embryonal Cell Tumors (Medulloblastomas) Treatment

Medulloblastoma occurs primarily in children, but may also occur in adults.[ 31 ] (Refer to the PDQ summary on Childhood Medulloblastoma and Other Central Nervous System Embryonal Tumors Treatment for more information.)

Standard treatment options for medulloblastomas include the following:

1. Surgery plus craniospinal radiation therapy for good-risk patients.[ 32 ]

Treatment options under clinical evaluation for medulloblastomas

Treatment options under clinical evaluation include the following:

1. Surgery plus craniospinal radiation therapy and various chemotherapy regimens are being evaluated for poor-risk patients.[ 32 ]

Pineal Parenchymal Tumors Treatment

Pineocytomas (WHO grade II), pineoblastomas (WHO grade IV), and pineal parenchymal tumors of intermediate differentiation are diverse tumors that require special consideration. Pineocytomas are slow-growing tumors and prognosis varies.

Pineoblastomas grow more rapidly and patients with these tumors have worse prognoses. Pineal parenchymal tumors of intermediate differentiation have unpredictable growth and clinical behavior.

Standard treatment options for pineal parenchymal tumors include the following:

1. Surgery plus radiation therapy for pineocytoma.
2. Surgery plus radiation therapy and chemotherapy for pineoblastoma.

Meningeal Tumors Treatment

WHO grade I meningiomas are usually curable when they are resectable. With the increasing use of sensitive neuroimaging tools, there has been more detection of asymptomatic low-grade meningiomas. Most appear to show minimal growth and can often be safely observed while therapy is deferred until growth or the development of symptoms.[ 33 ][ 34 ]

Standard treatment options for meningeal tumors include the following:

1. Active surveillance with deferred treatment, especially for incidentally discovered asymptomatic tumors.[ 33 ][ 34 ].
2. Surgery.
3. Stereotactic radiosurgery for tumors smaller than 3 cm.
4. Surgery plus radiation therapy in selected cases, such as for patients with known or suspected residual disease or with recurrence after previous surgery.
5. Fractionated radiation therapy for patients with unresectable tumors.[ 35 ]

The prognoses for patients with WHO grade II meningiomas (atypical, clear cell, and chordoid), WHO grade III meningiomas (anaplastic/malignant, rhabdoid, and papillary), and hemangiopericytomas are worse than the prognoses for patients with low-grade meningiomas because complete resections are less commonly feasible, and the proliferative capacity is greater.

Standard treatment options for grades II and III meningiomas and hemangiopericytomas include the following:

1. Surgery plus radiation therapy.

Germ Cell Tumors Treatment

The prognoses and treatment of patients with germ cell tumors—which include germinomas, embryonal carcinomas, choriocarcinomas, and teratomas—depend on tumor histology, tumor location, presence and amount of biological markers, and surgical resectability.

Treatment of Tumors of the Sellar Region

Craniopharyngiomas (WHO grade I) are often curable.

Standard treatment options for craniopharyngiomas include the following:

1. Surgery alone if the tumor is totally resectable.
2. Debulking surgery plus radiation therapy if the tumor is unresectable.

Treatment Options Under Clinical Evaluation for Primary CNS Tumors

Patients who have CNS tumors that are either infrequently curable or unresectable should be considered candidates for clinical trials. Information about ongoing clinical trials is available from the NCI website.

Heavy-particle radiation, such as proton-beam therapy, carries the theoretical advantage of delivering high doses of ionizing radiation to the tumor bed while sparing surrounding brain tissue. The data are preliminary for this investigational technique, and are not widely available.

Novel biologic therapies under clinical evaluation for patients with CNS tumors include the following:[ 36 ]

Current Clinical Trials

Use our advanced clinical trial search to find NCI-supported cancer clinical trials that are now enrolling patients. The search can be narrowed by location of the trial, type of treatment, name of the drug, and other criteria. General information about clinical trials is also available.

参考文献

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2. Kaye AH, Walker DG: Low grade astrocytomas: controversies in management. J Clin Neurosci 7 (6): 475-83, 2000.[PUBMED Abstract]
3. Buckner JC, Pugh SL, Shaw EG, et al.: Phase III study of radiation therapy with or without procarbazine, CCNU, and vincristine (PCV) in low-grade glioma: RTOG 9802 with Alliance, ECOG, and SWOG. [Abstract] J Clin Oncol 32 (Suppl 5): A-2000, 2014.[PUBMED Abstract]
4. Buckner JC, Shaw E, Pugh S, et al.: R9802: Phase III study of radiation therapy with or without procarbazine, CCNU, and vincristine (PCV) in low-grade glioma: Results by histologic type. [Abstract] Neuro-Oncology 16 (Suppl 5): A-AT-13, v11, 2014.[PUBMED Abstract]
5. Parsons DW, Jones S, Zhang X, et al.: An integrated genomic analysis of human glioblastoma multiforme. Science 321 (5897): 1807-12, 2008.[PUBMED Abstract]
6. Yan H, Parsons DW, Jin G, et al.: IDH1 and IDH2 mutations in gliomas. N Engl J Med 360 (8): 765-73, 2009.[PUBMED Abstract]
7. Dubbink HJ, Taal W, van Marion R, et al.: IDH1 mutations in low-grade astrocytomas predict survival but not response to temozolomide. Neurology 73 (21): 1792-5, 2009.[PUBMED Abstract]
8. Sanson M, Marie Y, Paris S, et al.: Isocitrate dehydrogenase 1 codon 132 mutation is an important prognostic biomarker in gliomas. J Clin Oncol 27 (25): 4150-4, 2009.[PUBMED Abstract]
9. Hartmann C, Hentschel B, Wick W, et al.: Patients with IDH1 wild type anaplastic astrocytomas exhibit worse prognosis than IDH1-mutated glioblastomas, and IDH1 mutation status accounts for the unfavorable prognostic effect of higher age: implications for classification of gliomas. Acta Neuropathol 120 (6): 707-18, 2010.[PUBMED Abstract]
10. Hartmann C, Meyer J, Balss J, et al.: Type and frequency of IDH1 and IDH2 mutations are related to astrocytic and oligodendroglial differentiation and age: a study of 1,010 diffuse gliomas. Acta Neuropathol 118 (4): 469-74, 2009.[PUBMED Abstract]
11. Watanabe T, Nobusawa S, Kleihues P, et al.: IDH1 mutations are early events in the development of astrocytomas and oligodendrogliomas. Am J Pathol 174 (4): 1149-53, 2009.[PUBMED Abstract]
12. Wick W, Hartmann C, Engel C, et al.: NOA-04 randomized phase III trial of sequential radiochemotherapy of anaplastic glioma with procarbazine, lomustine, and vincristine or temozolomide. J Clin Oncol 27 (35): 5874-80, 2009.[PUBMED Abstract]
13. Hegi ME, Diserens AC, Gorlia T, et al.: MGMT gene silencing and benefit from temozolomide in glioblastoma. N Engl J Med 352 (10): 997-1003, 2005.[PUBMED Abstract]
14. Gilbert MR, Wang M, Aldape KD, et al.: Dose-dense temozolomide for newly diagnosed glioblastoma: a randomized phase III clinical trial. J Clin Oncol 31 (32): 4085-91, 2013.[PUBMED Abstract]
15. Stupp R, Mason WP, van den Bent MJ, et al.: Radiotherapy plus concomitant and adjuvant temozolomide for glioblastoma. N Engl J Med 352 (10): 987-96, 2005.[PUBMED Abstract]
16. Stupp R, Hegi ME, Mason WP, et al.: Effects of radiotherapy with concomitant and adjuvant temozolomide versus radiotherapy alone on survival in glioblastoma in a randomised phase III study: 5-year analysis of the EORTC-NCIC trial. Lancet Oncol 10 (5): 459-66, 2009.[PUBMED Abstract]
17. Gilbert MR, Dignam JJ, Armstrong TS, et al.: A randomized trial of bevacizumab for newly diagnosed glioblastoma. N Engl J Med 370 (8): 699-708, 2014.[PUBMED Abstract]
18. Chinot OL, Wick W, Mason W, et al.: Bevacizumab plus radiotherapy-temozolomide for newly diagnosed glioblastoma. N Engl J Med 370 (8): 709-22, 2014.[PUBMED Abstract]
19. Fallon KB, Palmer CA, Roth KA, et al.: Prognostic value of 1p, 19q, 9p, 10q, and EGFR-FISH analyses in recurrent oligodendrogliomas. J Neuropathol Exp Neurol 63 (4): 314-22, 2004.[PUBMED Abstract]
20. Smith JS, Perry A, Borell TJ, et al.: Alterations of chromosome arms 1p and 19q as predictors of survival in oligodendrogliomas, astrocytomas, and mixed oligoastrocytomas. J Clin Oncol 18 (3): 636-45, 2000.[PUBMED Abstract]
21. Okamoto Y, Di Patre PL, Burkhard C, et al.: Population-based study on incidence, survival rates, and genetic alterations of low-grade diffuse astrocytomas and oligodendrogliomas. Acta Neuropathol 108 (1): 49-56, 2004.[PUBMED Abstract]
22. van den Bent MJ, Chinot O, Boogerd W, et al.: Second-line chemotherapy with temozolomide in recurrent oligodendroglioma after PCV (procarbazine, lomustine and vincristine) chemotherapy: EORTC Brain Tumor Group phase II study 26972. Ann Oncol 14 (4): 599-602, 2003.[PUBMED Abstract]
23. van den Bent MJ, Brandes AA, Taphoorn MJ, et al.: Adjuvant procarbazine, lomustine, and vincristine chemotherapy in newly diagnosed anaplastic oligodendroglioma: long-term follow-up of EORTC brain tumor group study 26951. J Clin Oncol 31 (3): 344-50, 2013.[PUBMED Abstract]
24. Cairncross G, Wang M, Shaw E, et al.: Phase III trial of chemoradiotherapy for anaplastic oligodendroglioma: long-term results of RTOG 9402. J Clin Oncol 31 (3): 337-43, 2013.[PUBMED Abstract]
25. Gilbert MR: Minding the Ps and Qs: perseverance and quality studies lead to major advances in patients with anaplastic oligodendroglioma. J Clin Oncol 31 (3): 299-300, 2013.[PUBMED Abstract]
26. Brada M, Stenning S, Gabe R, et al.: Temozolomide versus procarbazine, lomustine, and vincristine in recurrent high-grade glioma. J Clin Oncol 28 (30): 4601-8, 2010.[PUBMED Abstract]
27. Jiao Y, Killela PJ, Reitman ZJ, et al.: Frequent ATRX, CIC, FUBP1 and IDH1 mutations refine the classification of malignant gliomas. Oncotarget 3 (7): 709-22, 2012.[PUBMED Abstract]
28. Killela PJ, Reitman ZJ, Jiao Y, et al.: TERT promoter mutations occur frequently in gliomas and a subset of tumors derived from cells with low rates of self-renewal. Proc Natl Acad Sci U S A 110 (15): 6021-6, 2013.[PUBMED Abstract]
29. Killela PJ, Pirozzi CJ, Healy P, et al.: Mutations in IDH1, IDH2, and in the TERT promoter define clinically distinct subgroups of adult malignant gliomas. Oncotarget 5 (6): 1515-25, 2014.[PUBMED Abstract]
30. Oya N, Shibamoto Y, Nagata Y, et al.: Postoperative radiotherapy for intracranial ependymoma: analysis of prognostic factors and patterns of failure. J Neurooncol 56 (1): 87-94, 2002.[PUBMED Abstract]
31. Brandes AA, Ermani M, Amista P, et al.: The treatment of adults with medulloblastoma: a prospective study. Int J Radiat Oncol Biol Phys 57 (3): 755-61, 2003.[PUBMED Abstract]
32. Brandes AA, Franceschi E, Tosoni A, et al.: Long-term results of a prospective study on the treatment of medulloblastoma in adults. Cancer 110 (9): 2035-41, 2007.[PUBMED Abstract]
33. Nakamura M, Roser F, Michel J, et al.: The natural history of incidental meningiomas. Neurosurgery 53 (1): 62-70; discussion 70-1, 2003.[PUBMED Abstract]
34. Yano S, Kuratsu J; Kumamoto Brain Tumor Research Group: Indications for surgery in patients with asymptomatic meningiomas based on an extensive experience. J Neurosurg 105 (4): 538-43, 2006.[PUBMED Abstract]
35. Debus J, Wuendrich M, Pirzkall A, et al.: High efficacy of fractionated stereotactic radiotherapy of large base-of-skull meningiomas: long-term results. J Clin Oncol 19 (15): 3547-53, 2001.[PUBMED Abstract]
36. Fine HA: Promising new therapies for malignant gliomas. Cancer J 13 (6): 349-54, 2007 Nov-Dec.[PUBMED Abstract]
37. Fecci PE, Mitchell DA, Archer GE, et al.: The history, evolution, and clinical use of dendritic cell-based immunization strategies in the therapy of brain tumors. J Neurooncol 64 (1-2): 161-76, 2003 Aug-Sep.[PUBMED Abstract]
38. Newton HB: Molecular neuro-oncology and development of targeted therapeutic strategies for brain tumors. Part 1: Growth factor and Ras signaling pathways. Expert Rev Anticancer Ther 3 (5): 595-614, 2003.[PUBMED Abstract]
39. Kew Y, Levin VA: Advances in gene therapy and immunotherapy for brain tumors. Curr Opin Neurol 16 (6): 665-70, 2003.[PUBMED Abstract]
40. Chiocca EA, Aghi M, Fulci G: Viral therapy for glioblastoma. Cancer J 9 (3): 167-79, 2003 May-Jun.[PUBMED Abstract]

Treatment of Primary Tumors of the Spinal Axis

Surgery and radiation therapy are the primary modalities used to treat tumors of the spinal axis; therapeutic options vary according to the histology of the tumor.[ 1 ] The experience with chemotherapy for primary spinal cord tumors is limited; no reports of controlled clinical trials are available for these types of tumors.[ 1 ][ 2 ] Chemotherapy is indicated for most patients with leptomeningeal involvement from a primary or metastatic tumor and positive cerebrospinal fluid cytology.[ 1 ] Most patients require treatment with corticosteroids, particularly if they are receiving radiation therapy.

Patients who have spinal axis tumors that are either infrequently curable or unresectable should be considered candidates for clinical trials. Information about ongoing clinical trials is available from the NCI website.

参考文献

1. Cloughesy T, Selch MT, Liau L: Brain. In: Haskell CM: Cancer Treatment. 5th ed. Philadelphia, Pa: WB Saunders Co, 2001, pp 1106-42.[PUBMED Abstract]
2. Mehta M, Vogelbaum MA, Chang S, et al.: Neoplasms of the central nervous system. In: DeVita VT Jr, Lawrence TS, Rosenberg SA: Cancer: Principles and Practice of Oncology. 9th ed. Philadelphia, Pa: Lippincott Williams & Wilkins, 2011, pp 1700-49.[PUBMED Abstract]

Metastatic Brain Tumors

General Information About Metastatic Brain Tumors

Brain metastases outnumber primary neoplasms by at least 10 to 1, and they occur in 20% to 40% of cancer patients, with subsequent median survival generally less than 6 months.[ 1 ] The exact incidence is unknown because no national cancer registry documents brain metastases, but it has been estimated that 98,000 to 170,000 new cases are diagnosed in the United States each year.[ 2 ][ 3 ] This number may be increasing because of the capacity of magnetic resonance imaging (MRI) to detect small metastases and because of prolonged survival resulting from improved systemic therapy.[ 1 ][ 2 ]

The most common primary tumors with brain metastases and the percentage of patients effected are as follows:[ 1 ][ 2 ]

Eighty percent of brain metastases occur in the cerebral hemispheres, 15% occur in the cerebellum, and 5% occur in the brain stem.[ 2 ] Metastases to the brain are multiple in more than 70% of cases, but solitary metastases also occur.[ 1 ]

Brain involvement can occur with cancers of the nasopharyngeal region by direct extension along the cranial nerves or through the foramina at the base of the skull. Dural metastases may constitute as much as 9% of total brain metastases.

Clinical Features

The diagnosis of brain metastases in cancer patients is based on the following:

Patients may describe any of the following:

Often, family members or friends may notice the following:

Diagnostic Evaluation

A physical examination may show objective neurological findings or only minor cognitive changes. The presence of multiple lesions and a high predilection of primary tumor metastasis may be sufficient to make the diagnosis of brain metastasis.

A lesion in the brain should not be assumed to be a metastasis just because a patient has had a previous cancer; such an assumption could result in overlooking appropriate treatment of a curable tumor.

Imaging tests

Computed tomography scans with contrast or MRIs with gadolinium are quite sensitive in diagnosing the presence of metastases. Positron emission tomography scanning and spectroscopic evaluation are new strategies to diagnose cerebral metastases and to differentiate the metastases from other intracranial lesions.[ 4 ]

Biopsy

In the case of a solitary lesion or a questionable relationship to the primary tumor, a brain biopsy (via resection or stereotactic biopsy) may be necessary.

Treatment of Metastatic Brain Tumors

The optimal therapy for patients with brain metastases continues to evolve.[ 1 ][ 2 ][ 5 ] The following treatments have been used in the management of metastatic brain tumors:

Because most cases of brain metastases involve multiple metastases, a mainstay of therapy has historically been whole-brain radiation therapy (WBRT); however, stereotactic radiosurgery has come into increasingly common use. The role of radiosurgery continues to be defined. Stereotactic radiosurgery in combination with WBRT has been assessed.

Surgery is indicated to obtain tissue from a metastasis with an unknown primary tumor or to decompress a symptomatic dominant lesion that is causing significant mass effect.

Chemotherapy is usually not the primary therapy for most patients; however, it may have a role in the treatment of patients with brain metastases from chemosensitive tumors and can even be curative when combined with radiation for metastatic testicular germ cell tumors.[ 1 ][ 6 ] Intrathecal chemotherapy is also used for meningeal spread of metastatic tumors.

Treatment for patients with one to four metastases

Standard treatment options for patients with one to four metastases

About 10% to 15% of patients with cancer will have a single brain metastasis. Radiation therapy is the mainstay of palliation for these patients. The extent of extracranial disease can influence treatment of the brain lesions. In the presence of extensive active systemic disease, surgery provides little benefit for overall survival (OS). In patients with stable minimal extracranial disease, combined modality treatment may be considered, using surgical resection followed by radiation therapy. However, the published literature does not provide clear guidance.

Standard treatment options for patients with one to four metastases include the following:

1. WBRT with or without surgical resection.
2. WBRT with or without stereotactic radiosurgery.
3. Focal therapy alone (surgical resection or stereotactic radiosurgery).

Evidence (treatment for one to four metastases):

1. Three randomized trials examined resection of solitary brain metastases followed by WBRT versus WBRT alone, totaling 195 randomly assigned patients.[ 7 ][ 8 ][ 9 ] The process that necessarily goes into selecting appropriate patients for surgical resection may account for the small numbers in each trial. In the first trial,[ 7 ][Level of evidence: 1iiD] performed at a single center, all patients were selected and operated upon by one surgeon.
   1. The first two trials showed an improvement in survival in the surgery group,[ 7 ][ 8 ] but the third trial showed a trend in favor of the WBRT–only group.[ 9 ]
   2. The three trials were combined in a trial-level meta-analysis.[ 10 ] The combined analysis showed the following:
2. The need for WBRT after resection of solitary brain metastases has been studied.[ 11 ] Patients were randomly assigned to either undergo postoperative WBRT or receive no further treatment after resection.
3. One additional randomized study of observation versus WBRT after either surgery or stereotactic radiosurgery for solitary brain metastases was closed after 19 patients had been entered because of slow accrual; therefore, little can be deduced from the trial.[ 12 ]
4. A Radiation Therapy Oncology Group (RTOG) study (RTOG-9508) randomly assigned 333 patients with one to three metastases with a maximum diameter of 4 cm to WBRT (37.5 Gy over 3 weeks) with or without a stereotactic boost.[ 13 ] Patients with active systemic disease requiring therapy were excluded. The primary endpoint was OS with predefined hypotheses in both the full study population and the 186 patients with a solitary metastasis (and no statistical adjustment of P values for the two separate hypotheses).[ 13 ][Levels of evidence: 1iiDii for the full study population and 1iiA for patients with solitary metastases]
   1. Mean OS in the combined-therapy group was 5.7 months, and mean OS in the WBRT–alone group was 6.5 months (P = .14).
   2. Local control was better in the full population with combined therapy.
   3. At the 6-month follow-up, Karnofsky Performance status (considered a soft endpoint because of its imprecision and subjectivity) was better in the combined-therapy group, but there was no difference in mental status between the treatment groups. Acute and late toxicities were similar in both treatment arms. Quality of life was not assessed.
5. A phase III randomized trial compared adjuvant WBRT with observation after surgery or radiosurgery for a limited number of brain metastases in patients with stable solid tumors.[ 14 ][Level of evidence: 1iiC]
6. A meta-analysis of two trials with a total of 358 participants found no statistically significant difference in OS between the WBRT plus stereotactic radiosurgery group and the WBRT–alone group (HR, 0.82; 95% CI, 0.65–1.02).[ 15 ][Level of evidence: 1iiDiii]

A study that had a primary endpoint of learning and neurocognition, using a standardized test for total recall, was stopped by the Data and Safety Monitoring Board because of worse outcomes in the WBRT group.[ 16 ][Level of evidence: 1iiD]

Given this body of information, focal therapy plus WBRT or focal therapy alone, with close follow-up with serial MRIs and initiation of salvage therapy when clinically indicated, appear to be reasonable treatment options. The pros and cons of each approach should be discussed with the patient.

Several randomized trials have been performed that were designed with varying primary endpoints to address whether WBRT is necessary after focal treatment. The results can be summarized as follows:[ 16 ][ 17 ][ 18 ]

1. Studies consistently show that the addition of WBRT to focal therapy decreases the risk of progression and new metastases in the brain.
2. The addition of WBRT does not improve OS.
3. The decrease in risk of intracranial disease progression does not translate into improved functional or neurologic status, nor does it appear to decrease the risk of death from neurologic deterioration.
4. About half or more of the patients who receive focal therapy alone ultimately require salvage therapy, such as WBRT or radiosurgery, compared with about a quarter of the patients who are given up-front WBRT.
5. The impact of better local control associated with WBRT on quality of life has not been reported and remains an open question.

Leptomeningeal carcinomatosis (LC)

LC occurs in about 5% of all cancer patients. The most common types of cancer to spread to the leptomeninges are:

Diagnosis includes a combination of neurospinal axis imaging and cerebrospinal fluid (CSF) cytology. Median OS is in the range of 10 to 12 weeks.

The management of LC includes the following:

In a series of 149 patients with metastatic non-small cell lung carcinoma, cytologically proven LC, poor performance status, high protein level in the CSF, and a high initial CSF white blood cell count were significant poor prognostic factors for survival.[ 19 ] Patients received active treatment, including intrathecal chemotherapy, WBRT, or epidermal growth factor receptor-thymidine kinase-1, or underwent a ventriculoperitoneal shunt procedure.

In a retrospective series of 38 patients with metastatic breast cancer and LC, the proportion of LC cases varied by breast cancer subtype:[ 20 ]

Patients with triple-negative breast cancer had a shorter interval between metastatic breast cancer diagnosis and the development of LC. Median survival did not differ across breast cancer subtypes. Consideration of intrathecal administration of trastuzumab in patients with HER2-positive LC has also been described in case reports.[ 21 ]

参考文献

1. Patchell RA: The management of brain metastases. Cancer Treat Rev 29 (6): 533-40, 2003.[PUBMED Abstract]
2. Mehta M, Vogelbaum MA, Chang S, et al.: Neoplasms of the central nervous system. In: DeVita VT Jr, Lawrence TS, Rosenberg SA: Cancer: Principles and Practice of Oncology. 9th ed. Philadelphia, Pa: Lippincott Williams & Wilkins, 2011, pp 1700-49.[PUBMED Abstract]
3. Hutter A, Schwetye KE, Bierhals AJ, et al.: Brain neoplasms: epidemiology, diagnosis, and prospects for cost-effective imaging. Neuroimaging Clin N Am 13 (2): 237-50, x-xi, 2003.[PUBMED Abstract]
4. Schaefer PW, Budzik RF, Gonzalez RG: Imaging of cerebral metastases. Neurosurg Clin N Am 7 (3): 393-423, 1996.[PUBMED Abstract]
5. Soffietti R, Cornu P, Delattre JY, et al.: EFNS Guidelines on diagnosis and treatment of brain metastases: report of an EFNS Task Force. Eur J Neurol 13 (7): 674-81, 2006.[PUBMED Abstract]
6. Ogawa K, Yoshii Y, Nishimaki T, et al.: Treatment and prognosis of brain metastases from breast cancer. J Neurooncol 86 (2): 231-8, 2008.[PUBMED Abstract]
7. Patchell RA, Tibbs PA, Walsh JW, et al.: A randomized trial of surgery in the treatment of single metastases to the brain. N Engl J Med 322 (8): 494-500, 1990.[PUBMED Abstract]
8. Vecht CJ, Haaxma-Reiche H, Noordijk EM, et al.: Treatment of single brain metastasis: radiotherapy alone or combined with neurosurgery? Ann Neurol 33 (6): 583-90, 1993.[PUBMED Abstract]
9. Mintz AH, Kestle J, Rathbone MP, et al.: A randomized trial to assess the efficacy of surgery in addition to radiotherapy in patients with a single cerebral metastasis. Cancer 78 (7): 1470-6, 1996.[PUBMED Abstract]
10. Hart MG, Grant R, Garside R, et al.: Chemotherapeutic wafers for high grade glioma. Cochrane Database Syst Rev (3): CD007294, 2008.[PUBMED Abstract]
11. Patchell RA, Tibbs PA, Regine WF, et al.: Postoperative radiotherapy in the treatment of single metastases to the brain: a randomized trial. JAMA 280 (17): 1485-9, 1998.[PUBMED Abstract]
12. Roos DE, Wirth A, Burmeister BH, et al.: Whole brain irradiation following surgery or radiosurgery for solitary brain metastases: mature results of a prematurely closed randomized Trans-Tasman Radiation Oncology Group trial (TROG 98.05). Radiother Oncol 80 (3): 318-22, 2006.[PUBMED Abstract]
13. Andrews DW, Scott CB, Sperduto PW, et al.: Whole brain radiation therapy with or without stereotactic radiosurgery boost for patients with one to three brain metastases: phase III results of the RTOG 9508 randomised trial. Lancet 363 (9422): 1665-72, 2004.[PUBMED Abstract]
14. Soffietti R, Kocher M, Abacioglu UM, et al.: A European Organisation for Research and Treatment of Cancer phase III trial of adjuvant whole-brain radiotherapy versus observation in patients with one to three brain metastases from solid tumors after surgical resection or radiosurgery: quality-of-life results. J Clin Oncol 31 (1): 65-72, 2013.[PUBMED Abstract]
15. Patil CG, Pricola K, Sarmiento JM, et al.: Whole brain radiation therapy (WBRT) alone versus WBRT and radiosurgery for the treatment of brain metastases. Cochrane Database Syst Rev 9: CD006121, 2012.[PUBMED Abstract]
16. Chang EL, Wefel JS, Hess KR, et al.: Neurocognition in patients with brain metastases treated with radiosurgery or radiosurgery plus whole-brain irradiation: a randomised controlled trial. Lancet Oncol 10 (11): 1037-44, 2009.[PUBMED Abstract]
17. Aoyama H, Shirato H, Tago M, et al.: Stereotactic radiosurgery plus whole-brain radiation therapy vs stereotactic radiosurgery alone for treatment of brain metastases: a randomized controlled trial. JAMA 295 (21): 2483-91, 2006.[PUBMED Abstract]
18. Kocher M, Soffietti R, Abacioglu U, et al.: Adjuvant whole-brain radiotherapy versus observation after radiosurgery or surgical resection of one to three cerebral metastases: results of the EORTC 22952-26001 study. J Clin Oncol 29 (2): 134-41, 2011.[PUBMED Abstract]
19. Lee SJ, Lee JI, Nam DH, et al.: Leptomeningeal carcinomatosis in non-small-cell lung cancer patients: impact on survival and correlated prognostic factors. J Thorac Oncol 8 (2): 185-91, 2013.[PUBMED Abstract]
20. Torrejón D, Oliveira M, Cortes J, et al.: Implication of breast cancer phenotype for patients with leptomeningeal carcinomatosis. Breast 22 (1): 19-23, 2013.[PUBMED Abstract]
21. Bartsch R, Berghoff AS, Preusser M: Optimal management of brain metastases from breast cancer. Issues and considerations. CNS Drugs 27 (2): 121-34, 2013.[PUBMED Abstract]

Recurrent Adult CNS Tumors Treatment

Patients who have recurrent CNS tumors are rarely curable and should be considered candidates for clinical trials. Information about ongoing clinical trials is available from the NCI website.

Standard treatment options for recurrent CNS tumors include the following:

1. Chemotherapy.
2. Antiangiogenesis therapy.
3. Radiation therapy.
4. Surgery.

Chemotherapy

Localized chemotherapy (carmustine wafer)

Carmustine wafers have been investigated for the treatment of recurrent malignant gliomas, but the impact on survival is less clear than at the time of initial diagnosis and resection.

Evidence (localized chemotherapy):

1. In a multicenter randomized, placebo-controlled trial, 222 patients with recurrent malignant primary brain tumors requiring reoperation were randomly assigned to receive implanted carmustine wafers or placebo biodegradable wafers.[ 1 ][Level of evidence: 1iA] Approximately half of the patients had received prior systemic chemotherapy. The two treatment groups were well balanced at baseline.
2. A Cochrane Collaboration systematic review of chemotherapeutic wafers for high-grade glioma focused on the unadjusted analysis and reported the same trial as negative.[ 2 ]

Systemic chemotherapy

Systemic therapy (e.g., temozolomide, lomustine, or the combination of procarbazine, a nitrosourea, and PCV in patients who have not previously received the drugs) has been used at the time of recurrence of primary malignant brain tumors. However, this approach has not been tested in controlled studies. Patient-selection factors likely play a strong role in determining outcomes, so the impact of therapy on survival is not clear.

Antiangiogenesis Therapy

In 2009, the U.S. Food and Drug Administration (FDA) granted accelerated approval of bevacizumab monotherapy for patients with progressive glioblastoma. The indication was granted under the FDA’s accelerated approval program that permits the use of certain surrogate endpoints or an effect on a clinical endpoint other than survival or irreversible morbidity as bases for approvals of products intended for serious or life-threatening illnesses or conditions.

The approval was based on the demonstration of improved objective response rates observed in two historically controlled, single-arm, or noncomparative phase II trials.[ 3 ][ 4 ][Level of evidence: 3iiiDiv] On the basis of these data and FDA approval, bevacizumab monotherapy has become standard therapy for recurrent glioblastoma.

Evidence (antiangiogenesis therapy):

1. The FDA independently reviewed an open-label, multicenter, noncomparative phase II study that randomly assigned 167 recurrent glioblastoma multiforme (GBM) patients to receive bevacizumab alone or bevacizumab in combination with irinotecan,[ 3 ] although only efficacy data from the bevacizumab monotherapy arm (n = 85) were used to support drug approval.
2. The FDA independently assessed another single-arm, single-institution trial in which 56 recurrent glioblastoma patients were treated with bevacizumab alone.[ 4 ]

Currently, however, no data are available from prospective, randomized controlled trials demonstrating improvement in health outcomes, such as disease-related symptoms or increased survival with the use of bevacizumab to treat glioblastoma.

Radiation Therapy

Because there are no randomized trials, the role of repeat radiation after disease progression or the development of radiation-induced cancers is also ill defined. Interpretation is difficult because the literature is limited to small retrospective case series.[ 5 ] The decision must be made carefully because of the risk of neurocognitive deficits and radiation necrosis.

Surgery

Re-resection of recurrent CNS tumors is used for some patients. However, most patients do not qualify because of a deteriorating condition or technically inoperable tumors. The evidence is limited to noncontrolled studies and case series of patients who are healthy enough and have tumors that are small enough to technically debulk. The impact on survival of reoperation versus patient selection is not known.

Current Clinical Trials

Use our advanced clinical trial search to find NCI-supported cancer clinical trials that are now enrolling patients. The search can be narrowed by location of the trial, type of treatment, name of the drug, and other criteria. General information about clinical trials is also available.

参考文献

1. Brem H, Piantadosi S, Burger PC, et al.: Placebo-controlled trial of safety and efficacy of intraoperative controlled delivery by biodegradable polymers of chemotherapy for recurrent gliomas. The Polymer-brain Tumor Treatment Group. Lancet 345 (8956): 1008-12, 1995.[PUBMED Abstract]
2. Hart MG, Grant R, Garside R, et al.: Chemotherapeutic wafers for high grade glioma. Cochrane Database Syst Rev (3): CD007294, 2008.[PUBMED Abstract]
3. Friedman HS, Prados MD, Wen PY, et al.: Bevacizumab alone and in combination with irinotecan in recurrent glioblastoma. J Clin Oncol 27 (28): 4733-40, 2009.[PUBMED Abstract]
4. Kreisl TN, Kim L, Moore K, et al.: Phase II trial of single-agent bevacizumab followed by bevacizumab plus irinotecan at tumor progression in recurrent glioblastoma. J Clin Oncol 27 (5): 740-5, 2009.[PUBMED Abstract]
5. Paulino AC, Mai WY, Chintagumpala M, et al.: Radiation-induced malignant gliomas: is there a role for reirradiation? Int J Radiat Oncol Biol Phys 71 (5): 1381-7, 2008.[PUBMED Abstract]

Changes to This Summary (01/22/2020)

The PDQ cancer information summaries are reviewed regularly and updated as new information becomes available. This section describes the latest changes made to this summary as of the date above.

General Information About Adult Central Nervous System (CNS) Tumors

Updated statistics with estimated new cases and deaths for 2020 (cited American Cancer Society as reference 2).

This summary is written and maintained by the PDQ Adult Treatment Editorial Board, which is editorially independent of NCI. The summary reflects an independent review of the literature and does not represent a policy statement of NCI or NIH. More information about summary policies and the role of the PDQ Editorial Boards in maintaining the PDQ summaries can be found on the About This PDQ Summary and PDQ® - NCI's Comprehensive Cancer Database pages.

About This PDQ Summary

Purpose of This Summary

This PDQ cancer information summary for health professionals provides comprehensive, peer-reviewed, evidence-based information about the treatment of adult central nervous system tumors. It is intended as a resource to inform and assist clinicians who care for cancer patients. It does not provide formal guidelines or recommendations for making health care decisions.

Reviewers and Updates

This summary is reviewed regularly and updated as necessary by the PDQ Adult Treatment Editorial Board, which is editorially independent of the National Cancer Institute (NCI). The summary reflects an independent review of the literature and does not represent a policy statement of NCI or the National Institutes of Health (NIH).

Board members review recently published articles each month to determine whether an article should:

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Levels of Evidence

Some of the reference citations in this summary are accompanied by a level-of-evidence designation. These designations are intended to help readers assess the strength of the evidence supporting the use of specific interventions or approaches. The PDQ Adult Treatment Editorial Board uses a formal evidence ranking system in developing its level-of-evidence designations.

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PDQ® Adult Treatment Editorial Board. PDQ Adult Central Nervous System Tumors Treatment. Bethesda, MD: National Cancer Institute. Updated <MM/DD/YYYY>. Available at: https://www.cancer.gov/types/brain/hp/adult-brain-treatment-pdq. Accessed <MM/DD/YYYY>. [PMID: 26389419]

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