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Incidence and Mortality
Estimated new cases and deaths from breast cancer (men only) in the United States in 2021:
Male breast cancer is rare. Fewer than 1% of all breast carcinomas occur in men.[3,4] The mean age at diagnosis is between 60 and 70 years; however, males of all ages can be affected with the disease.
Anatomy of the male breast. The nipple and areola are shown on the outside of the breast. The lymph nodes, fatty tissue, ducts, and other parts of the inside of the breast are also shown.
Predisposing risk factors for male breast cancer appear to include the following:[5,6]
Signs of breast cancer in men may include the following:
When breast cancer is suspected, patient management generally includes the following:
The following tests and procedures are used to diagnose breast cancer:
(Refer to the Diagnosis section in the PDQ summary on Breast Cancer Treatment [Adult] for information about evaluating the contralateral breast and molecular profiling [estrogen-receptor and progesterone-receptor status and human epidermal growth factor receptor 2 (HER2/neu) expression status of the tumor].)
The pathology of male breast cancer is similar to that of female breast cancer, and infiltrating ductal cancer is the most common tumor type (refer to Table 1). Intraductal cancer, inflammatory carcinoma, and Paget disease of the nipple have also been seen in men, but lobular carcinoma in situ has not.
Lymph node involvement and the hematogenous pattern of spread are similar to what is observed in female breast cancer.
Prognosis and Predictive Factors
Factors that correlate well with prognosis include the following:[5,15]
Overall survival is similar to that of women with breast cancer. The impression that male breast cancer has a worse prognosis may stem from the tendency toward diagnosis at a later stage.[2,5,16]
The AJCC staging system provides a strategy for grouping patients with a similar prognosis. The stage of the disease is determined by the following:
Treatment decisions are based on the stage of disease and the general health of the patient.
The TNM (tumor, node, metastasis) staging system for male breast cancer is identical to the staging system for female breast cancer. (Refer to TNM Definitions in the Stage Information for Breast Cancer section in the PDQ summary on Breast Cancer Treatment [Adult] for more information.)
Standard treatment options for men with breast cancer are described in Table 2.
The approach to the treatment of breast cancer in men is similar to that in women. Because male breast cancer is rare, there is a lack of randomized data to support specific treatment modalities.
Treatment of Early/Localized/Operable Male Breast Cancer
As in women, standard treatment options for men with early-stage breast cancer include the following:
Surgery with or without radiation therapy
Primary standard treatment is a modified radical mastectomy with axillary dissection.[1,2,3] Responses are generally similar to those seen in women with breast cancer. Breast conservation surgery with lumpectomy and radiation therapy has also been used, and results have been similar to those seen in women with breast cancer.
(Refer to Surgery in the Early/Localized/Operable Breast Cancer section in the PDQ summary on Breast Cancer Treatment [Adult] for more information.)
In men, no controlled studies have compared adjuvant treatment options. Adjuvant therapies used to treat early/localized/operable male breast cancer are outlined in Table 3.
In men with node-negative tumors, adjuvant therapy should be considered on the same basis as for women with breast cancer because there is no evidence that response to therapy is different between men and women.
In men with node-positive tumors, both chemotherapy plus tamoxifen and other hormonal therapy have been used and are believed to increase survival to the same extent as in women with breast cancer.
Approximately 85% of all male breast cancers are estrogen receptor–positive, and 70% of them are progesterone receptor–positive.[2,12] Response to hormone therapy correlates with the presence of these receptors. Hormonal therapy has been recommended in all patients with receptor-positive cancers.[1,2] Tamoxifen use, however, is associated with a high rate of treatment-limiting symptoms, such as hot flashes and impotence, in male breast cancer patients. Responses are generally similar to those seen in women with breast cancer. (Refer to Postoperative Systemic Therapy and Preoperative Systemic Therapy in the Early/Localized/Operable Breast Cancer section in the PDQ summary on Breast Cancer Treatment [Adult] for more information.)
Regarding endocrine therapy, tamoxifen is generally used instead of an aromatase inhibitor (AI) because the data supporting the use of an AI in men with breast cancer are limited. A retrospective analysis of 257 men with stage I to stage III breast cancer included 50 men treated with an AI and 207 men treated with tamoxifen. The following results were observed:
The use of AI therapy with a luteinizing hormone-releasing hormone agonist has been reported in several cases in the literature. The German Breast Group is conducting a randomized phase II clinical trial (NCT01638247) of tamoxifen with or without gonadotropin-releasing hormone (GnRH) analogue versus AI plus GnRH analogue in men with early-stage, hormone receptor–positive breast cancer; results are pending.
Treatment of Locoregional Recurrent Male Breast Cancer
Standard treatment options for men with locoregional recurrent breast cancer include the following:
Responses are generally similar to those seen in women with breast cancer.[2,11]
(Refer to the Locoregional Recurrent Breast Cancer section in the PDQ summary on Breast Cancer Treatment [Adult] for more information.)
Treatment of Metastatic Male Breast Cancer
Standard treatment options for men with metastatic breast cancer include the following:
Hormonal therapy is used as the initial treatment. Responses are generally similar to those seen in women with breast cancer.[2,11]
(Refer to the Metastatic Breast Cancer section in the PDQ summary on Breast Cancer Treatment [Adult] for more information.)
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 Male Breast Cancer
Updated statistics with estimated new cases and deaths for 2021 (cited American Cancer Society as reference 1).
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.
Purpose of This Summary
This PDQ cancer information summary for health professionals provides comprehensive, peer-reviewed, evidence-based information about the treatment of male breast cancer. 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.
The lead reviewers for Male Breast Cancer Treatment are:
Any comments or questions about the summary content should be submitted to Cancer.gov through the NCI website's Email Us. Do not contact the individual Board Members with questions or comments about the summaries. Board members will not respond to individual inquiries.
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.
Permission to Use This Summary
PDQ is a registered trademark. Although the content of PDQ documents can be used freely as text, it cannot be identified as an NCI PDQ cancer information summary unless it is presented in its entirety and is regularly updated. However, an author would be permitted to write a sentence such as "NCI's PDQ cancer information summary about breast cancer prevention states the risks succinctly: [include excerpt from the summary]."
The preferred citation for this PDQ summary is:
PDQ® Adult Treatment Editorial Board. PDQ Male Breast Cancer Treatment. Bethesda, MD: National Cancer Institute. Updated <MM/DD/YYYY>. Available at: https://www.cancer.gov/types/breast/hp/male-breast-treatment-pdq. Accessed <MM/DD/YYYY>. [PMID: 26389234]
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Last Revised: 2021-01-29
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