This book firstly introduces the epidemiology, clinical diagnosis, molecular typing and staging of breast cancer, and then focuses on the principles of drug treatment of breast cancer, as well as the specific treatment options for different molecular subtypes of breast cancer. By collecting the key research data on the progress of global breast cancer drug therapy and the current treatment guideline recommendations, this book lists hundreds of effective drug treatment regimens, and describes the usage, suitable population, efficacy and safety of each drug. To guide clinicians to carry out more scientific and standardized drug treatment of breast cancer, so as to improve the overall treatment level of breast cancer. With clear ideas, concise text, and clear diagrams, this book presents an overview of the pharmacological management of breast cancer, which is classically used and will be an outstanding companion for clinicians in the treatment of breast cancer.