Male breast cancer

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👨‍⚕️ Pathophysiology - Not Just for Ladies

  • Core Mechanism: An increased Estrogen to Androgen ratio is the primary driver, stimulating ductal epithelial proliferation.
  • Histology: Predominantly Invasive Ductal Carcinoma (IDC), >85% of cases.
    • Lobular carcinoma is rare due to rudimentary terminal lobules in the male breast.
  • Genetics: Strong association with BRCA2 mutations (higher risk than BRCA1).

⭐ Over 90% of male breast cancers are Estrogen Receptor (ER) positive. This makes endocrine therapy (e.g., Tamoxifen) a cornerstone of treatment.

Invasive ductal carcinoma in male breast tissue (histology)

👨‍⚕️ Clinical Manifestations - Lumps & Bumps

Male breast cancer: mammography and ultrasound

  • Primary Sign: A painless, firm, non-tender, and fixed subareolar mass. This is the presenting symptom in >85% of men.
  • Location: Typically located just beneath the nipple-areolar complex, but can be eccentric.
  • Associated Signs: Common due to minimal breast tissue.
    • Nipple retraction, inversion, or ulceration.
    • Bloody or serosanguinous nipple discharge.
    • Skin dimpling (peau d'orange), erythema, or fixation to the skin.
  • Lymphadenopathy: Palpable axillary lymph nodes are a frequent finding, present in up to 50% of patients at initial diagnosis.

⭐ Because of the small amount of male breast tissue, tumors are more likely to invade the nipple-areolar complex, skin, and underlying pectoralis muscle early.

🩺 Diagnosis - Spotting the Suspect

  • Initial Evaluation: Any palpable, firm, subareolar mass in a male is the most common presentation.

    • Assess for nipple retraction, bloody discharge, skin changes (dimpling, ulceration), or axillary lymphadenopathy.
  • Diagnostic Pathway:

  • Biopsy:
    • Core Needle Biopsy (CNB) is the gold standard. It provides tissue for histology and receptor testing (ER, PR, HER2).
    • Fine-Needle Aspiration (FNA) is less preferred due to high inadequacy rates.

Pearl: Unlike in females, screening mammography is not recommended for asymptomatic men. Diagnosis is prompted by symptoms.

🔪 Management - The Surgical Strike

  • Primary Surgery: Modified Radical Mastectomy (MRM) is the standard of care. It involves removing the entire breast, nipple-areolar complex, and performing an axillary evaluation.

  • BCT is Rare: Breast-conserving therapy is seldom used due to small breast volume, which leads to poor cosmesis and high rates of positive margins.

  • Axillary Staging: Essential for prognosis and guiding adjuvant therapy.

  • Post-Mastectomy Radiation (PMRT): Indicated for high-risk features: tumor >5 cm, positive margins, or significant nodal disease (≥4 nodes).

⭐ Mastectomy is the rule for men. Unlike in female breast cancer, skin-sparing or nipple-sparing techniques are generally avoided due to the high incidence of central tumor location.

Modified Radical Mastectomy for Male Breast Cancer

⚡ Biggest Takeaways

  • BRCA2 is the most significant genetic risk factor; Klinefelter syndrome is also high-yield.
  • Typically presents as a painless, subareolar mass in older men (average age ~70).
  • Histology is almost always Infiltrating Ductal Carcinoma (IDC).
  • Most tumors are hormone receptor-positive (ER+/PR+), guiding therapy with tamoxifen.
  • Standard treatment is mastectomy, not lumpectomy, due to small breast size.
  • Prognosis is similar to females stage-for-stage but often diagnosed at a later stage.

Practice Questions: Male breast cancer

Test your understanding with these related questions

A 42-year-old woman is seen by her primary care physician for her annual checkup. She has no current concerns and says that she has been healthy over the last year except for a bout of the flu in December. She has no significant past medical history and is not currently taking any medications. She has smoked 1 pack per day since she was 21 and drinks socially with her friends. Her family history is significant for prostate cancer in her dad when he was 51 years of age and ovarian cancer in her paternal aunt when she was 41 years of age. Physical exam reveals a firm, immobile, painless lump in the upper outer quadrant of her left breast as well as 2 smaller nodules in the lower quadrants of her right breast. Biopsy of these lesions shows small, atypical, glandular, duct-like cells with stellate morphology. Which of the following pathways is most likely abnormal in this patient?

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Flashcards: Male breast cancer

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Testicular tumors present as a firm, painless testicular mass that _____ be transilluminated

TAP TO REVEAL ANSWER

Testicular tumors present as a firm, painless testicular mass that _____ be transilluminated

cannot

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