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Breast cancer is the most frequently diagnosed cancer and the second leading
cause of cancer-related death among women globally. It originates in the
breast tissue, most commonly in the ducts or lobules, and may spread locally
or metastasize to distant organs.

Epidemiology
Breast cancer affects women of all races and ages, but incidence and outcomes
vary:

• Race/Ethnicity: White women have the highest overall incidence in the U.S., but Black women are more likely to be diagnosed with aggressive subtypes such as triple-negative breast cancer and have higher mortality rates.
  • Age: Most cases occur in women aged 50 and above, with risk increasing with age. However, breast cancer can also affect younger women and men.
  • Men: Male breast cancer accounts for less than 1% of cases. Risk factors include genetic predisposition (BRCA2 mutation), radiation exposure, liver disease, and hormonal imbalances.

Symptoms
Common signs include:

• A new lump or mass in the breast or underarm
  • Swelling, skin irritation, or dimpling
  • Nipple discharge (especially bloody or clear)
  • Inversion of the nipple
  • Pain in the breast or nipple area

In men, a painless lump or nipple changes may be noted.

Diagnosis
Early detection is key to improving outcomes. Diagnostic methods include:

• Regular Screening Mammograms: Recommended annually or
  biennially starting at age 40–50, depending on guidelines. Detects early,
  asymptomatic disease.
  • Diagnostic Mammograms: Used when symptoms are present or if
  abnormalities are found in a screening mammogram. Offers more
  detailed imaging.
  • Breast MRI: Useful for high-risk women (e.g., BRCA mutation carriers)
  and to assess tumor extent or evaluate dense breasts.
  • Ultrasound: Often used for younger women or for further evaluation of
  a palpable mass.
  • Biopsy: Confirms diagnosis through histological examination.

Treatment

Treatment is individualized based on cancer type, stage, and biomarkers:

• Surgery: Lumpectomy or mastectomy (with or without reconstruction).
  • Radiation therapy: Often used after surgery to reduce recurrence risk.
  • Chemotherapy: Indicated for more advanced or aggressive cancers.
  • Hormonal therapy: For hormone receptor-positive cancers (e.g.,
  tamoxifen, aromatase inhibitors).
  • Targeted therapy: HER2-positive cancers benefit from agents like
  trastuzumab.
  • Immunotherapy: Emerging role in triple-negative breast cancer.

Prognosis

Survival rates have improved due to early detection and advancements in
therapy:

• Five-year survival for localized breast cancer is ~99%.
  • If regional or distant spread has occurred, survival drops significantly.
  • Prognosis is influenced by tumor biology, stage, age, and response to
  treatment.

Conclusion
Breast cancer remains a major public health issue, with disparities in
incidence and outcomes by race and sex. Regular screening mammograms, timely diagnosis, and personalized treatment significantly improve survival. Awareness of male breast cancer and high-risk populations is essential for early detection and improved care.