Medical oncologists often lack knowledge of the adverse drug effects of treatment regimens, leading to overuse of adjuvant drugs or reduction in the dose of chemotherapy drugs. The latter is particularly common, and underdosing of drugs directly affects efficacy (according to evidence from evidence-based medicine, increasing the dose of a drug does not necessarily improve efficacy, but reducing the dose will definitely reduce it). The authors of this book have long been engaged in clinical oncology and collected information on adverse drug reactions to various common treatment regimens for oncology at home and abroad, and have reviewed the adverse reactions and proposed preventive measures to reduce them. Through reading this book, readers can have a more comprehensive understanding of the adverse effects of various treatment regimens, which can help ensure the efficacy of drugs and prevent and reduce the occurrence of adverse effects of treatment regimens.