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医療専門家向け Breast Cancer Treatment During Pregnancy (PDQ®)

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This PDQ cancer information summary for health professionals provides comprehensive, peer-reviewed, evidence-based information about the treatment of breast cancer during pregnancy. 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 Breast Cancer Treatment During Pregnancy

Incidence

Breast cancer is the most common cancer in pregnant and postpartum women and occurs in about 1 in 3,000 pregnant women. The average patient is between the ages of 32 years and 38 years. Because many women are choosing to delay childbearing, it is likely that the incidence of breast cancer during pregnancy will increase.

Anatomy

Drawing of female breast anatomy showing the lymph nodes, nipple, areola, chest wall, ribs, muscle, fatty tissue, lobe, ducts, and lobules.

画像を拡大する

Anatomy of the female breast. The nipple and areola are shown on the outside of the breast. The lymph nodes, lobes, lobules, ducts, and other parts of the inside of the breast are also shown.

Diagnostic Evaluation

The natural tenderness and engorgement of the breasts of pregnant and lactating women may hinder detection of discrete masses and early diagnosis of breast cancer. Delays in diagnosis are common, with an average reported delay of 5 to 15 months from the onset of symptoms.[ 1 ][ 2 ][ 3 ][ 4 ] Because of this delay, cancers are typically detected at a later stage than in a nonpregnant, age-matched population.[ 5 ]

The following tests and procedures may be used to diagnose breast cancer during pregnancy:

To detect breast cancer, pregnant and lactating women should consider practicing self-examination and undergo a clinical breast examination as part of the routine prenatal examination by a doctor. If an abnormality is found, diagnostic approaches such as ultrasound and mammography may be used. With proper shielding, mammography poses little risk of radiation exposure to the fetus.[ 6 ] Mammograms are only used, however, to evaluate dominant masses and to locate occult carcinomas in the presence of other suspicious physical findings.[ 6 ]

Because at least 25% of mammograms in pregnancy may be negative in the presence of cancer, a biopsy is essential for the diagnosis of any palpable mass. Diagnosis may be safely accomplished with a fine-needle aspiration, core biopsy, or excisional biopsy under local anesthesia. To avoid a false-positive diagnosis as a result of misinterpretation of pregnancy-related changes, the pathologist should be advised that the patient is pregnant.[ 7 ]

Breast cancer pathology is similar in age-matched pregnant and nonpregnant women. Hormone receptor assays using a competitive binding assay are usually negative in pregnant breast cancer patients, but this may be the result of receptor binding by high serum estrogen levels associated with the pregnancy. Enzyme immunocytochemical receptor assays are more sensitive than competitive binding assays. A study that used both assay methods indicated similar receptor positivity between pregnant and nonpregnant women with breast cancer.[ 8 ] The study concluded that increased estrogen levels during pregnancy could result in a higher incidence of receptor positivity detected with immunohistochemistry than is detected by radiolabeled ligand-binding assay because of competitive inhibition by high levels of endogenous estrogen.

Refer to the Diagnosis section in the PDQ summary on Breast Cancer Treatment for more information about the diagnosis of breast cancer.

Prognosis

Overall survival of pregnant women with breast cancer may be worse than survival of nonpregnant women at all stages;[ 6 ] however, this may be primarily the result of delayed diagnosis.[ 9 ] Termination of pregnancy has not been shown to have any beneficial effect on breast cancer outcome and is not usually considered as a therapeutic option.[ 1 ][ 2 ][ 4 ][ 10 ][ 11 ]

参考文献
  1. Hoover HC Jr: Breast cancer during pregnancy and lactation. Surg Clin North Am 70 (5): 1151-63, 1990.[PUBMED Abstract]
  2. Gwyn K, Theriault R: Breast cancer during pregnancy. Oncology (Huntingt) 15 (1): 39-46; discussion 46, 49-51, 2001.[PUBMED Abstract]
  3. Moore HC, Foster RS Jr: Breast cancer and pregnancy. Semin Oncol 27 (6): 646-53, 2000.[PUBMED Abstract]
  4. Rugo HS: Management of breast cancer diagnosed during pregnancy. Curr Treat Options Oncol 4 (2): 165-73, 2003.[PUBMED Abstract]
  5. Clark RM, Chua T: Breast cancer and pregnancy: the ultimate challenge. Clin Oncol (R Coll Radiol) 1 (1): 11-8, 1989.[PUBMED Abstract]
  6. Yang WT, Dryden MJ, Gwyn K, et al.: Imaging of breast cancer diagnosed and treated with chemotherapy during pregnancy. Radiology 239 (1): 52-60, 2006.[PUBMED Abstract]
  7. Middleton LP, Amin M, Gwyn K, et al.: Breast carcinoma in pregnant women: assessment of clinicopathologic and immunohistochemical features. Cancer 98 (5): 1055-60, 2003.[PUBMED Abstract]
  8. Elledge RM, Ciocca DR, Langone G, et al.: Estrogen receptor, progesterone receptor, and HER-2/neu protein in breast cancers from pregnant patients. Cancer 71 (8): 2499-506, 1993.[PUBMED Abstract]
  9. Petrek JA, Dukoff R, Rogatko A: Prognosis of pregnancy-associated breast cancer. Cancer 67 (4): 869-72, 1991.[PUBMED Abstract]
  10. Barnavon Y, Wallack MK: Management of the pregnant patient with carcinoma of the breast. Surg Gynecol Obstet 171 (4): 347-52, 1990.[PUBMED Abstract]
  11. Gallenberg MM, Loprinzi CL: Breast cancer and pregnancy. Semin Oncol 16 (5): 369-76, 1989.[PUBMED Abstract]
Stage Information for Breast Cancer Treatment and Pregnancy

Staging Evaluation

The following procedures are used to determine the extent of the cancer:

Procedures used for determining the stage of breast cancer are modified for pregnant women to avoid radiation exposure to the fetus. Nuclear scans cause fetal radiation exposure.[ 1 ] If such scans are essential for evaluation, hydration and Foley catheter drainage of the bladder can be used to prevent retention of radioactivity. Timing of the exposure to radiation relative to the gestational age of the fetus may be more critical than the actual dose of radiation delivered.[ 2 ] Radiation exposure during the first trimester (>0.1 Gy) may lead to congenital malformations, mental retardation, and increased relative risk of carcinogenesis.

Chest x-rays with abdominal shielding are considered safe, but as with all radiologic procedures, they are used only when essential for making treatment decisions.[ 1 ][ 3 ] A chest x-ray delivers 0.00008 Gy.[ 4 ]

For the diagnosis of bone metastases, a bone scan is preferable to a skeletal series because the bone scan delivers a smaller amount of radiation and is more sensitive. A bone scan delivers 0.001 Gy.[ 5 ]

Evaluation of the liver can be performed with ultrasound, and brain metastases can be diagnosed with an MRI scan. Data on MRI during pregnancy are not yet available, but gadolinium crosses the placenta and is associated with fetal abnormalities in rats.[ 5 ]

American Joint Committee on Cancer (AJCC) Stage Groupings and Definitions of TNM

Refer to the Stage Information for Breast Cancer section in the PDQ summary on Breast Cancer Treatment for more information.

参考文献
  1. Gwyn K, Theriault R: Breast cancer during pregnancy. Oncology (Huntingt) 15 (1): 39-46; discussion 46, 49-51, 2001.[PUBMED Abstract]
  2. Barnavon Y, Wallack MK: Management of the pregnant patient with carcinoma of the breast. Surg Gynecol Obstet 171 (4): 347-52, 1990.[PUBMED Abstract]
  3. Nicklas AH, Baker ME: Imaging strategies in the pregnant cancer patient. Semin Oncol 27 (6): 623-32, 2000.[PUBMED Abstract]
  4. Gallenberg MM, Loprinzi CL: Breast cancer and pregnancy. Semin Oncol 16 (5): 369-76, 1989.[PUBMED Abstract]
  5. Yang WT, Dryden MJ, Gwyn K, et al.: Imaging of breast cancer diagnosed and treated with chemotherapy during pregnancy. Radiology 239 (1): 52-60, 2006.[PUBMED Abstract]
Treatment of Early/Localized/Operable Breast Cancer During Pregnancy

Generally, pregnant women with stage I or stage II breast cancer are treated in the same way as nonpregnant patients, with some modifications to protect the fetus.

Treatment options for early/localized/operable breast cancer in pregnant women include the following:

  1. Surgery. Postpartum radiation therapy may also be given to women diagnosed with breast cancer late in pregnancy.
  2. Chemotherapy (after the first trimester).
  3. Endocrine therapy (after delivery).

The use of trastuzumab during pregnancy is contraindicated.

Surgery

Surgery is recommended as the primary treatment of breast cancer in pregnant women.

The data regarding safety of sentinel lymph node biopsy in pregnant patients are limited to several retrospective case series. One study examined sentinel lymph node biopsy in eight patients in the first trimester, nine patients in the second trimester, and eight patients in the third trimester. Technetium Tc 99m alone was used in 16 patients, methylene blue dye alone was used in seven patients, and two patients had unknown mapping methods. All 25 patients had live-born infants, of whom 24 were healthy, and one had a cleft palate (in the setting of other maternal risk factors).[ 1 ]

Because radiation in therapeutic doses may expose the fetus to potentially harmful scatter radiation,[ 2 ] modified radical mastectomy is the treatment of choice if the breast cancer was diagnosed early in pregnancy. If diagnosed late in pregnancy, breast-conserving surgery with postpartum radiation therapy has been used for breast preservation.[ 3 ] An analysis has been performed that helps to predict the risk of waiting to have radiation.[ 4 ][ 5 ]

Chemotherapy

Data suggest that it is safe to administer certain chemotherapeutic drugs after the first trimester, with most pregnancies resulting in live births with low rates of morbidity in the newborns.

Anthracycline-based chemotherapy (doxorubicin plus cyclophosphamide or fluorouracil, doxorubicin, and cyclophosphamide [FAC]) appears to be safe to administer during the second and/or third trimester on the basis of limited prospective data.[ 6 ][ 7 ][ 8 ] Safety data on the use of taxanes during pregnancy are limited.

Evidence (use of chemotherapy during the second and/or third trimester of pregnancy):

  1. A multicenter case-control study compared pediatric outcomes of 129 children whose mothers had breast cancer with matched children of women without cancer. In the pregnancy study group, 96 children (74.4%) were exposed to chemotherapy, 11 (8.5%) to radiation therapy, 13 (10.1%) to surgery alone, 2 (1.7%) to other drug treatments, and 14 (10.9%) to no treatment.[ 9 ]
  2. In a prospective single-arm study, 57 pregnant breast cancer patients were treated with FAC in the adjuvant or neoadjuvant setting.[ 6 ]
  3. The findings of the prospective single-arm study above were consistent with other smaller retrospective series of anthracycline-based chemotherapy.[ 7 ][ 8 ]
  4. A systematic review studied 40 case reports of taxane administration during the second or third trimesters of pregnancy.[ 10 ]

Endocrine Therapy

Endocrine therapy is generally avoided until after delivery. Case reports and a literature review of tamoxifen during pregnancy show that tamoxifen administration during pregnancy is associated with vaginal bleeding, miscarriage, congenital abnormalities such as Goldenhar syndrome, and fetal death.[ 11 ][ 12 ][ 13 ] Breastfeeding is also not recommended concurrently with endocrine therapy.[ 14 ]

Targeted Therapy

The use of trastuzumab during pregnancy is contraindicated based on results of a systematic review of 17 studies (18 pregnancies, 19 newborns).[ 15 ] Of the fetal complications noted, occurrence of oligohydramnios/anhydramnios was the most common (61.1%) adverse event. Of the pregnancies exposed to trastuzumab during the second or third trimester, 73.3% of the pregnancies were complicated with oligohydramnios/anhydramnios. Of the pregnancies exposed to trastuzumab exclusively during the first trimester, 0% (P = .043) of the pregnancies were complicated with oligohydramnios/anhydramnios. The mean gestational age at delivery was 33.8 weeks, and the mean weight of newborns at delivery was 2,261 grams or 4.984 pounds. In 52.6% of cases, a healthy neonate was born. At the long-term evaluation, all children who were without problems at birth were healthy, with a median follow-up of 9 months, and four of nine children who faced troubles at birth had died within an interval ranging from birth to 5.25 months. All children exposed to trastuzumab in utero exclusively in the first trimester were completely healthy at birth. The data suggest that for women who become pregnant during trastuzumab administration and wish to continue pregnancy, trastuzumab should be stopped and pregnancy would be allowed to continue.

参考文献
  1. Gropper AB, Calvillo KZ, Dominici L, et al.: Sentinel lymph node biopsy in pregnant women with breast cancer. Ann Surg Oncol 21 (8): 2506-11, 2014.[PUBMED Abstract]
  2. Kal HB, Struikmans H: Radiotherapy during pregnancy: fact and fiction. Lancet Oncol 6 (5): 328-33, 2005.[PUBMED Abstract]
  3. Gwyn K, Theriault R: Breast cancer during pregnancy. Oncology (Huntingt) 15 (1): 39-46; discussion 46, 49-51, 2001.[PUBMED Abstract]
  4. Nettleton J, Long J, Kuban D, et al.: Breast cancer during pregnancy: quantifying the risk of treatment delay. Obstet Gynecol 87 (3): 414-8, 1996.[PUBMED Abstract]
  5. Kuerer HM, Gwyn K, Ames FC, et al.: Conservative surgery and chemotherapy for breast carcinoma during pregnancy. Surgery 131 (1): 108-10, 2002.[PUBMED Abstract]
  6. Hahn KM, Johnson PH, Gordon N, et al.: Treatment of pregnant breast cancer patients and outcomes of children exposed to chemotherapy in utero. Cancer 107 (6): 1219-26, 2006.[PUBMED Abstract]
  7. Turchi JJ, Villasis C: Anthracyclines in the treatment of malignancy in pregnancy. Cancer 61 (3): 435-40, 1988.[PUBMED Abstract]
  8. Zemlickis D, Lishner M, Degendorfer P, et al.: Fetal outcome after in utero exposure to cancer chemotherapy. Arch Intern Med 152 (3): 573-6, 1992.[PUBMED Abstract]
  9. Amant F, Vandenbroucke T, Verheecke M, et al.: Pediatric Outcome after Maternal Cancer Diagnosed during Pregnancy. N Engl J Med 373 (19): 1824-34, 2015.[PUBMED Abstract]
  10. Mir O, Berveiller P, Goffinet F, et al.: Taxanes for breast cancer during pregnancy: a systematic review. Ann Oncol 21 (2): 425-6, 2010.[PUBMED Abstract]
  11. Cullins SL, Pridjian G, Sutherland CM: Goldenhar's syndrome associated with tamoxifen given to the mother during gestation. JAMA 271 (24): 1905-6, 1994 Jun 22-29.[PUBMED Abstract]
  12. Tewari K, Bonebrake RG, Asrat T, et al.: Ambiguous genitalia in infant exposed to tamoxifen in utero. Lancet 350 (9072): 183, 1997.[PUBMED Abstract]
  13. Isaacs RJ, Hunter W, Clark K: Tamoxifen as systemic treatment of advanced breast cancer during pregnancy--case report and literature review. Gynecol Oncol 80 (3): 405-8, 2001.[PUBMED Abstract]
  14. Helewa M, Lévesque P, Provencher D, et al.: Breast cancer, pregnancy, and breastfeeding. J Obstet Gynaecol Can 24 (2): 164-80; quiz 181-4, 2002.[PUBMED Abstract]
  15. Zagouri F, Sergentanis TN, Chrysikos D, et al.: Trastuzumab administration during pregnancy: a systematic review and meta-analysis. Breast Cancer Res Treat 137 (2): 349-57, 2013.[PUBMED Abstract]
Treatment of Advanced Breast Cancer During Pregnancy

There is no standard treatment for patients with advanced (stage III or stage IV) breast cancer during pregnancy. Most studies show a 5-year survival rate of 10% in pregnant patients with stage III or IV disease.

First-trimester radiation therapy should be avoided. Chemotherapy may be given after the first trimester as discussed in the section on Early/Localized/Operable Breast Cancer During Pregnancy.

Because the mother's life span may be limited, and there is a risk of fetal damage with treatment during the first trimester,[ 1 ][ 2 ] issues regarding continuation of the pregnancy should be discussed with the patient and her family. Therapeutic abortion does not improve prognosis.[ 1 ][ 2 ][ 3 ][ 4 ][ 5 ]

参考文献
  1. Hoover HC Jr: Breast cancer during pregnancy and lactation. Surg Clin North Am 70 (5): 1151-63, 1990.[PUBMED Abstract]
  2. Rugo HS: Management of breast cancer diagnosed during pregnancy. Curr Treat Options Oncol 4 (2): 165-73, 2003.[PUBMED Abstract]
  3. Gwyn K, Theriault R: Breast cancer during pregnancy. Oncology (Huntingt) 15 (1): 39-46; discussion 46, 49-51, 2001.[PUBMED Abstract]
  4. Clark RM, Chua T: Breast cancer and pregnancy: the ultimate challenge. Clin Oncol (R Coll Radiol) 1 (1): 11-8, 1989.[PUBMED Abstract]
  5. Barnavon Y, Wallack MK: Management of the pregnant patient with carcinoma of the breast. Surg Gynecol Obstet 171 (4): 347-52, 1990.[PUBMED Abstract]
Special Considerations for Pregnancy and Breast Cancer

Lactation

Suppression of lactation does not improve prognosis. If surgery is planned, however, lactation is suppressed to decrease the size and vascularity of the breasts. If chemotherapy is to be given, lactation is also suppressed because many antineoplastic agents (i.e., cyclophosphamide and methotrexate), when given systemically, may occur in high levels in breast milk and would affect the nursing baby. Women receiving chemotherapy should not breastfeed.[ 1 ]

Fetal Consequences of Maternal Breast Cancer

No damaging effects on the fetus from maternal breast cancer have been demonstrated,[ 2 ] and there are no reported cases of maternal-fetal transfer of breast cancer cells.

Pregnancy in Patients With a History of Breast Cancer

Based on limited retrospective data, pregnancy does not appear to compromise the survival of women with a previous history of breast cancer, and no deleterious effects have been demonstrated in the fetus.[ 3 ][ 4 ][ 5 ][ 6 ][ 7 ][ 8 ][ 9 ][ 10 ][ 11 ] Some physicians recommend that patients wait 2 years after diagnosis before attempting to conceive. This allows early recurrence to become manifest, which may influence the decision to become a parent.

Little is known about pregnancy after bone marrow transplantation and high-dose chemotherapy with or without total-body irradiation. In one report of pregnancies after bone marrow transplantation for hematologic disorders, a 25% incidence of preterm labor and low birth weight for gestational-age infants was noted.[ 12 ]

参考文献
  1. Helewa M, Lévesque P, Provencher D, et al.: Breast cancer, pregnancy, and breastfeeding. J Obstet Gynaecol Can 24 (2): 164-80; quiz 181-4, 2002.[PUBMED Abstract]
  2. Amant F, Vandenbroucke T, Verheecke M, et al.: Pediatric Outcome after Maternal Cancer Diagnosed during Pregnancy. N Engl J Med 373 (19): 1824-34, 2015.[PUBMED Abstract]
  3. Clark RM, Chua T: Breast cancer and pregnancy: the ultimate challenge. Clin Oncol (R Coll Radiol) 1 (1): 11-8, 1989.[PUBMED Abstract]
  4. Harvey JC, Rosen PP, Ashikari R, et al.: The effect of pregnancy on the prognosis of carcinoma of the breast following radical mastectomy. Surg Gynecol Obstet 153 (5): 723-5, 1981.[PUBMED Abstract]
  5. Petrek JA: Pregnancy safety after breast cancer. Cancer 74 (1 Suppl): 528-31, 1994.[PUBMED Abstract]
  6. von Schoultz E, Johansson H, Wilking N, et al.: Influence of prior and subsequent pregnancy on breast cancer prognosis. J Clin Oncol 13 (2): 430-4, 1995.[PUBMED Abstract]
  7. Kroman N, Mouridsen HT: Prognostic influence of pregnancy before, around, and after diagnosis of breast cancer. Breast 12 (6): 516-21, 2003.[PUBMED Abstract]
  8. Malamos NA, Stathopoulos GP, Keramopoulos A, et al.: Pregnancy and offspring after the appearance of breast cancer. Oncology 53 (6): 471-5, 1996 Nov-Dec.[PUBMED Abstract]
  9. Gelber S, Coates AS, Goldhirsch A, et al.: Effect of pregnancy on overall survival after the diagnosis of early-stage breast cancer. J Clin Oncol 19 (6): 1671-5, 2001.[PUBMED Abstract]
  10. Gwyn K, Theriault R: Breast cancer during pregnancy. Oncology (Huntingt) 15 (1): 39-46; discussion 46, 49-51, 2001.[PUBMED Abstract]
  11. Rugo HS: Management of breast cancer diagnosed during pregnancy. Curr Treat Options Oncol 4 (2): 165-73, 2003.[PUBMED Abstract]
  12. Sanders JE, Hawley J, Levy W, et al.: Pregnancies following high-dose cyclophosphamide with or without high-dose busulfan or total-body irradiation and bone marrow transplantation. Blood 87 (7): 3045-52, 1996.[PUBMED Abstract]
Changes to This Summary (03/29/2019)

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.

Stage Information for Breast Cancer Treatment and Pregnancy

Editorial changes were made to this section.

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 breast cancer during pregnancy. 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:

Changes to the summaries are made through a consensus process in which Board members evaluate the strength of the evidence in the published articles and determine how the article should be included in the summary.

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PDQ® Adult Treatment Editorial Board. PDQ Breast Cancer Treatment During Pregnancy. Bethesda, MD: National Cancer Institute. Updated <MM/DD/YYYY>. Available at: https://www.cancer.gov/types/breast/hp/pregnancy-breast-treatment-pdq. Accessed <MM/DD/YYYY>. [PMID: 26389427]

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