Breast cancer is a malignancy characterized by the uncontrolled proliferation of abnormal cells originating in the mammary tissue. The disease arises from alterations in the genetic material of the cells, leading to the loss of normal regulatory mechanisms that govern cell growth and death. Diagnosis typically involves the examination of tissue samples and the analysis of biomarkers to determine the grade and stage of the condition, which informs prognosis. Treatment modalities are generally multimodal, employing physical interventions such as surgical removal of affected tissue, cytotoxic therapies designed to kill fast-dividing cells, and hormonal therapies that target specific growth pathways within the tumor. Ongoing research focuses on identifying novel molecular targets to develop highly specific therapies that minimize damage to healthy tissue.