Breast Carcinomas: General Hypotheses, Risk Factors, and Biological Behaviour - A Comprehensive Review

Abstract

Breast carcinomas represent a heterogeneous group of malignant neoplasms that constitute the most frequently diagnosed cancer amongst women worldwide, with an estimated 2.3 million new cases annually according to recent global cancer statistics. This comprehensive review examines the current understanding of breast carcinoma pathogenesis, encompassing the multifaceted hypotheses underlying tumour development, the complex array of risk factors contributing to disease susceptibility, and the diverse biological behaviours exhibited by different molecular subtypes.

Background: The pathogenesis of breast carcinomas involves a multistep process characterised by the accumulation of genetic alterations and environmental influences, progressing from normal epithelial cells through hyperplasia, premalignant changes, and in situ carcinoma to invasive disease.

Methods: Contemporary molecular classification systems, incorporating immunohistochemical assessment of oestrogen receptor, progesterone receptor, and human epidermal growth factor receptor expression, have revolutionised therapeutic approaches and prognostic stratification.

Results: The biological behaviour of breast carcinomas varies significantly across molecular subtypes, with luminal A tumours demonstrating indolent growth patterns and favourable prognosis, whilst triple-negative breast cancers exhibit aggressive characteristics with propensity for early metastasis and treatment resistance.