Treatment for Male Breast Cancer
Read our blog, Men Get Breast Cancer Too.
Breast cancer can occur in men. This may be called male breast cancer. In 2025, it’s estimated 2,800 new cases of male breast cancer will be diagnosed in the U.S. [270].
Men can also be diagnosed with benign (not cancer) breast conditions.
Find more statistics on breast cancer in men.
Types of breast cancer in men
Most male breast cancers are invasive ductal carcinomas (the cancer begins in the milk ducts of the breast).
Fewer than 2% of breast cancers in men are invasive lobular carcinomas (the cancer begins in the lobules of the breast) [271].
Men can also be diagnosed with ductal carcinoma in situ (a non-invasive breast cancer) [271]. Inflammatory breast cancer and Paget disease of the breast (Paget disease of the nipple) are rare in men [271].
Male breast cancers tend to be hormone receptor-positive and HER2-negative [271-272].
Learn about the anatomy of the breast.
Genetic testing in men
The National Comprehensive Cancer Network (NCCN) recommends all men diagnosed with breast cancer get genetic testing for BRCA1 and BRCA2 (BRCA1/2) inherited gene mutations [8]. This is because men with breast cancer are more likely than women with breast cancer to have a BRCA1/2 inherited gene mutation [273].
Genetic testing to guide treatment
For people with breast cancer, knowing you have a BRCA1/2 inherited gene mutation can help guide treatment. Men who have a BRCA1/2 inherited gene mutation may be treated with a PARP inhibitor.
Learn about treatment with a PARP inhibitor for early breast cancer.
Learn about treatment with a PARP inhibitor for metastatic breast cancer.
Genetic testing to learn about risk
Genetic testing is recommended for all men diagnosed with breast cancer to learn if the breast cancer is related to an inherited gene mutation [8]. Some inherited gene mutations increase the risk of breast cancer and other cancers, and this information can be important for your family members [8].
- Men who have a BRCA2 inherited gene mutation, and to a lesser degree men who have a BRCA1 mutation, have an increased risk of breast cancer [8,274-278].
- Men who have a BRCA1 or BRCA2 inherited gene mutation have an increased risk of prostate cancer and pancreatic cancer [8,275-281].
- Men who have a BRCA2 inherited gene mutation have an increased risk of melanoma [8,279]
There are special cancer screening recommendations for men with a BRCA1 or BRCA2 inherited gene mutation.
Your health care provider can recommend a genetic counselor so you can learn more about genetic testing.
Learn more about genetic testing and genetic counseling.
Learn more about BRCA1 and BRCA2 inherited gene mutations and the risk of breast and other cancers in men.
Treatment for metastatic male breast cancer
Learn about treatment for metastatic breast cancer.
Treatment for early and locally advanced male breast cancer
Treatment for breast cancer in men is similar to treatment for women.
Treatment for early and locally advanced breast cancers includes some combination of:
- Surgery
- Radiation therapy
- Chemotherapy
- Hormone therapy
- HER2-targeted therapy
- CDK4/6 inhibitor therapy
- Immunotherapy
- PARP inhibitor therapy
Surgery and radiation therapy
Mastectomy
Breast cancer surgery in men is usually a mastectomy because of the small size of the male breast. Some men may choose to have breast reconstruction.
Some men who have a mastectomy may also have radiation therapy after surgery, depending on the stage of the breast cancer.
Lumpectomy
Sometimes, breast cancer surgery in men is a lumpectomy (also called breast-conserving surgery).
Men who have a lumpectomy usually have radiation therapy after surgery.
Hormone therapy
Most male breast cancers are hormone receptor-positive [271-272].
For men with hormone receptor-positive breast cancers, the hormone therapy drug tamoxifen, with or without the CDK4/6 inhibitor abemaciclib (Verzenio), is usually the first drug therapy used. Tamoxifen is a pill taken every day for 5-10 years.
For men who can’t take tamoxifen, an aromatase inhibitor combined with androgen deprivation therapy may be used to treat hormone receptor-positive breast cancer.
Side effects of tamoxifen in men
In men, possible side effects of tamoxifen include [115-118]:
Common
- Headache
- Hot flashes
- Impotence
- Loss of sex drive
- Nausea and vomiting
Rare
- Cataracts
- Deep venous thrombosis (blood clots in the large veins)
- Pulmonary emboli (blood clots in the lungs)
- Skin rash
- Stroke
Completing hormone therapy
To get the most benefit from hormone therapy, you need to take the recommended course of treatment. Men who complete the recommended course have better survival than those who don’t [105].
Tamoxifen for breast cancer treatment is prescribed for 5-10 years. The length of treatment along with side effects can make it tough to complete treatment.
Before you begin taking tamoxifen, talk with your health care team about possible side effects and how to manage them.
If you have any side effects with tamoxifen, talk with your health care team.
If you have trouble remembering to take your medicine, a daily pillbox or setting an alarm on your watch or mobile device (you may be able to download an app) may help.
However, you don’t need to panic if you miss a day or two.
Learn more about the importance of following your treatment plan.
Chemotherapy, HER2-targeted therapy, immunotherapy and PARP inhibitor therapy
For men with hormone receptor-negative breast cancer, chemotherapy is usually the first drug therapy used.
For men with hormone receptor-positive breast cancer, chemotherapy may be given before tamoxifen therapy, depending on the cancer stage.
Men who have HER2-positive breast cancers may be treated with HER2-targeted therapy. For example, treatment may include trastuzumab (Herceptin) plus chemotherapy.
Some men with triple negative breast cancer may get the immunotherapy drug pembrolizumab (Keytruda).
Some men who have a BRCA1 or BRCA2 inherited gene mutation and have HER2-negative breast cancer may get the PARP inhibitor olaparib (Lynparza).
Survival for men with breast cancer
The chances of survival for breast cancer in men are similar to the chances of survival in women of the same age and cancer stage [282].
However, men are often diagnosed at a later stage than women [282-283]. Men do not routinely get screening mammograms and they may be less likely than women to report warning signs or symptoms of breast cancer. This may lead to a delay in diagnosis [284].
Chances of survival and dying from breast cancer
Breast cancer survival and mortality (death) rates are averages and vary by the stage of the breast cancer at diagnosis.
Chances of survival and breast cancer death for men diagnosed with breast cancer, by stage at diagnosis |
||||
Stage at diagnosis of male breast cancer |
Survival at 5 years |
Survival at 10 years |
Death from breast cancer within 20 years of diagnosis |
|
Stage I |
98% |
92% |
12% |
|
Stage II |
91% |
82% |
26% |
|
Stage III |
79% |
66% |
46% |
|
Source: Leone et al., 2024 [285] |
||||
Learn more about survival rates.
Treatment guidelines
Although the exact treatment for breast cancer varies from person to person, evidence-based guidelines help make sure high-quality care is given. These guidelines are based on the latest research and agreement among experts.
The National Comprehensive Cancer Network (NCCN) and the American Society of Clinical Oncology (ASCO) are respected organizations that regularly review and update their guidelines.
In addition, the National Cancer Institute (NCI) has treatment overviews.
Talk with your health care team about which treatment guidelines they follow.
After you get a recommended treatment plan from your health care team, study your treatment options. Together with your health care team, make thoughtful, informed decisions that are best for you. Each treatment has risks and benefits to consider along with your own values and lifestyle.
Clinical trials
Read the blog, How Do You Thank Someone For Time.
Research is ongoing to improve all areas of treatment for breast cancer.
New therapies are being studied in clinical trials. The results of these studies will determine whether these therapies become part of the standard of care.
After discussing the benefits and risks with your health care provider, we encourage you to consider joining a clinical trial if there’s one right for you.
Susan G. Komen® Patient Care Center |
If you or a loved one needs information or resources about clinical trials, the Patient Care Center can help. Contact the Komen Breast Care Helpline at 1-877-465-6636 or email clinicaltrialinfo@komen.org. Se habla español. |
BreastCancerTrials.org in collaboration with Komen offers a custom matching service to help find clinical trials that fit your needs.
Learn what else Komen is doing to help people find and participate in breast cancer clinical trials, including trials supported by Komen.
Learn more about clinical trials.
Support for men with breast cancer
Social support is important after a breast cancer diagnosis.
Men with breast cancer may feel alone. Support groups for breast cancer may only have female members, so joining a support group for men with any type of cancer may be more helpful.
Our Support section has a list of organizations that offer online support groups and other support resources for men with breast cancer.
Learn more about social support, support groups and support resources.
Susan G. Komen® Support Resources |
|
Updated 02/28/25
This content is regularly reviewed by an expert panel including researchers, practicing clinicians and patient advocates.
