Breast tumors are abnormal proliferations of breast tissue that span a broad biological spectrum, from benign lesions such as fibroadenoma to malignant neoplasms, the most common of which are carcinomas arising in the ductal or lobular epithelium. Malignant disease is conventionally staged along a continuum from in-…
Breast tumors are abnormal proliferations of breast tissue that span a broad biological spectrum, from benign lesions such as fibroadenoma to malignant neoplasms, the most common of which are carcinomas arising in the ductal or lobular epithelium. Malignant disease is conventionally staged along a continuum from in-situ proliferation confined by the basement membrane, through invasive carcinoma, to metastatic spread. Beyond epithelial carcinomas, the breast can host rarer entities, including primary breast lymphoma, melanoma involving breast tissue, and, in animals, mammary tumors that serve as comparative models of human disease. Classification integrates histologic appearance with molecular characterization, particularly hormone-receptor status and HER2 expression. Estrogen-receptor-positive disease represents a major subtype whose growth depends on hormonal signaling and whose biology is shaped by downstream effectors such as insulin-receptor-substrate proteins. Molecular profiling has also produced prognostic and predictive tools, including multigene recurrence-score assays that estimate the likelihood of distant relapse and inform decisions about adjuvant therapy. Underlying tumor cell biology, including pathways governing proliferation, signaling mutations, and the entry of cells into senescence, determines clinical behavior and treatment response. Recognizing the full diversity of breast tumors, including uncommon presentations and implant-associated lymphoid neoplasms, is essential for accurate diagnosis, risk stratification, and management.
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