Obesity, chronic breast inflammation and carcinogenesis: Molecular pathways and clinical implications (Review)

Obesity is a global epidemic strongly associated with increased breast cancer (BC) risk and mortality, particularly in postmenopausal women. Obesity‑induced chronic breast inflammation drives carcinogenesis via dysregulated adipokine signaling (leptin and adiponectin), insulin resistance, hyperinsulinemia and pro‑inflammatory cytokines (TNF‑α and IL‑6). These factors activate oncogenic pathways (NF‑κB and PI3K/AKT/mTOR pathways), which promote DNA damage, cell proliferation and immunosuppression. Clinically, obesity is associated with advanced tumor presentation, reduced treatment efficacy and poorer survival compared with those of normal‑weight patients with BC. Despite progress, the molecular interactions between obesity‑related inflammation and BC remain incompletely understood, and diagnostic/prognostic tools for obese patients require refinement. The present review synthesizes current evidence on obesity‑BC mechanisms and their clinical translation to inform prevention and precision oncology strategies.