Triple-Negative Breast Cancer

Triple-negative breast cancer (TNBC) is an aggressive and rare subtype of breast cancer, accounting for approximately 10% of all cases, characterized by the absence of estrogen receptors (ER), progesterone receptors (PR), and human epidermal growth factor receptor 2 (HER2), rendering it unresponsive to hormone therapy and HER2-targeted treatments. It predominantly affects younger women and African American women, with a higher incidence in these populations. TNBC is typically high-grade, exhibiting rapid growth and early metastatic potential, leading to a greater risk of recurrence and poorer prognosis compared to hormone receptor-positive breast cancers. Clinical presentation is similar to other breast cancers, often manifesting as a palpable lump or thickening in the breast or axillary region. Due to its lack of targeted therapeutic options, treatment primarily relies on chemotherapy, highlighting the urgent need for novel therapies.