Beyond the Pink: Male Breast Cancer is Rare But on the Rise — and Earlier Detection is Needed

When discussing breast cancer, it is often seen as a predominantly female health issue. However, male breast cancer — though rare — is a growing concern and accounts for slightly less than 1 percent of all breast cancer diagnoses in the United States.

The American Cancer Society estimates that 2,800 new cases of male breast cancer will be diagnosed by the end of 2025, with more than 500 deaths. By comparison, 317,00 new cases of female breast cancer will be diagnosed, with more than 42,000 deaths, the ACS adds.

Cristina Lopez-Penalver, M.D., breast surgical oncologist with Baptist Health Miami Cancer Institute.

The rise in male breast cancer cases—parallel to the ongoing obesity epidemic—underscores the need for greater public education, according to breast cancer specialists.

Early detection, risk awareness, and reducing stigma are critical steps toward improving outcomes for men, according to Cristina Lopez-Penalver, M.D., a breast surgical oncologist with Baptist Health Miami Cancer Institute; and Christine V. Pestana, M.D., breast surgical oncologist at the Eugene M. and Christine E. Lynn Cancer Institute at Boca Raton Regional Hospital, both part of Baptist Health.

Rising Incidence and Risk Factors

Though male breast cancer remains rare, data indicates a gradual increase in its incidence. Dr. Lopez-Penalver attributes this rise to factors such as obesity and hormonal imbalances. “There’s an annual increase of about 1 percent or less in male breast cancer cases,” she explains. “The obesity epidemic plays a significant role, as it leads to elevated estrogen levels, which stimulate breast epithelial proliferation and can facilitate malignant transformation which is the mechanism of action behind breast cancer.”

Dr. Pestana explains how obesity and alcohol use can raise the risk of male breast cancer. “Obesity increases estrogen levels through the conversion of androgens in fat tissue,” she says. “Chronic alcohol use and liver disease also contribute by altering hormone metabolism, further elevating estrogen levels.”

Genetics also play a critical role in male breast cancer risk, particularly mutations in the BRCA2 gene. While both men and women are equally likely to inherit BRCA mutations, men are far less frequently tested.

Christine V. Pestana, M.D., breast surgical oncologist at the Eugene M. and Christine E. Lynn Cancer Institute.

Dr. Lopez-Penalver notes that “about 4 to 16 percent of male breast cancer patients have a BRCA2 mutation.”

Dr. Pestana emphasizes that BRCA2 mutations can raise a man’s lifetime breast cancer risk to as much as 6 percent. Beyond genetic factors, rare conditions such as Klinefelter syndrome—a chromosomal abnormality resulting in an extra X chromosome—dramatically increase risk.

“Klinefelter syndrome elevates the risk up to 20 to 60 times,” said Dr. Pestana.

Symptoms and Challenges of Early Diagnosis

A major challenge with male breast cancer is its frequent diagnosis at later stages, leading to poorer survival outcomes. Unlike women, men do not undergo routine breast cancer screenings, leading to delayed detection.

“There’s no routine screening for men because it’s so rare,” says Dr. Lopez-Penalver. “Men tend to downplay symptoms, lack education about the disease, or feel embarrassed due to stigma. All of this contributes to diagnosis at a later stage.”

Dr. Pestana points out that societal perceptions compound the issue. “Many men think of breast cancer as a ‘woman’s disease,’” she states. “There’s stigma and embarrassment associated with seeking evaluation for breast-related symptoms. This often leads men to delay medical attention.”

The warning signs for male breast cancer mirror those seen in women, including painless breast lumps, skin changes, and nipple abnormalities.

“Any lump in the breast is a warning,” says Dr. Lopez-Penalver. “Look out for nipple retraction, asymmetry, or discharge—these are all telltale signs that warrant evaluation.”

Dr. Pestana highlights the importance of paying attention to redness, ulceration, or swelling in the armpit as potential indicators. Despite these warning signs, men often misattribute symptoms to benign conditions or dismiss them entirely, further delaying diagnosis.

Biological Differences Between Male and Female Breast Cancer

When it comes to the biological characteristics of breast cancer, there are notable differences between men and women. Dr. Lopez-Penalver explains: “More than 90 percent of male breast cancers are hormone receptor-positive, compared to 70-80 percent in women.”

Hormone receptor-positive breast cancer refers to tumors that grow in response to hormones like estrogen or progesterone. Men also experience fewer cases of HER2-positive breast cancer, a subtype in which tumors have higher levels of the HER2 protein.

Additionally, the types of breast cancer men encounter differ from those in women.

“Men primarily develop ductal carcinoma, as male breasts lack the lobules where lobular carcinomas form,” says Dr. Lopez-Penalver. Ductal carcinoma originates in the breast ducts, while lobular carcinoma arises from milk-producing lobules, which are absent in male anatomy.

Dr. Pestana notes how male breast cancer treatment often involves mastectomy due to the limited amount of breast tissue. “Male patients frequently opt for mastectomy, sometimes even choosing surgery on both sides for symmetry, which differentiates their treatment pathways from women,” she explains.

The Role of Awareness and Targeted Screening

Education and awareness are instrumental in addressing the stigma surrounding male breast cancer, both physicians emphasize. Societal misconceptions perpetuate late diagnoses and poorer outcomes, they say.

“Most of the advertising and pamphlets that are out there are all dedicated to women because it's much more common in women,” says Dr. Lopez-Penalver. “But it’s important to educate men that this can happen to them as well. And they should be aware of the signs and symptoms. ”

Dr. Pestana advocates for targeted screening among at-risk men. “Genetic testing is underutilized in men. Those with BRCA mutations or a strong family history could benefit greatly from targeted screenings,” she asserts.

While routine population-wide screening is unlikely due to the rarity of male breast cancer, personalized approaches for high-risk individuals may offer a pathway to earlier detection and better outcomes, they point out.

Steps Toward Better Outcomes

The current understanding of male breast cancer is often drawn from research on female patients, underlining the need for further studies focusing specifically on men. Despite challenges, treatment methods such as surgery, chemotherapy, and hormone therapy offer promise.

“Our treatments work, but they’re largely based on female data,” Dr. Pestana said. “Improving awareness and implementing targeted screenings could improve male breast cancer outcomes significantly.”

Addressing male breast cancer requires more than medical intervention—it requires cultural change, the physicians stress. Breaking down the stigma surrounding the disease and normalizing discussions about men’s breast health will empower men to seek help sooner.

“Even though it’s not common, it’s important to educate men and eliminate the stigma associated with male breast cancer,” Dr. Lopez-Penalver said. “Awareness can save lives.”

Male breast cancer is a hidden condition demanding more attention, research, and advocacy. Though rare, its rising incidence and the preventable challenge of late-stage diagnosis highlight the need for targeted interventions.

“While male breast cancer is rare, it's rising because of the obesity epidemic,” said Dr. Pestana. “And it's strongly tied to genetic and hormonal factors, often diagnosed late due to the stigma and lack of awareness.”