The book "Biomarkers in Breast Cancer" encompasses a comprehensive examination of biomarkers and their transformative role in the epidemiology, detection, and treatment of breast cancer. It navigates through the intricate roles biomarkers play, from aiding in the early detection of breast cancer, where they serve as crucial tools in identifying the disease in its nascent stages, to their utility in the precise classification and treatment of various breast cancer subtypes.The book underscores the diversity of breast cancer subtypes, each characterized by distinct molecular profiles which biomarkers help delineate, thus aiding in tailoring interventions with remarkable precision. The work highlights the importance of genetic biomarkers, like BRCA1/2 and HER2, in identifying individuals at high risk and guiding treatment decisions. It also delves into the potential of epigenetic biomarkers and their role in the disease's progression and management, recognizing the challenges and ethical considerations in their use.In the arena of treatment, the book illustrates how biomarkers are pivotal in the evolution of personalized medicine.