Twenty-five years ago, a monograph on gastric cancer was published by the Italian Society of Surgery: that book is recognized as a milestone in the management of these tumors in Italy. Oncological and surgical knowledge in the field of gastric cancer have changed dramatically over the last 25 years. The aim of this book is to offer an essential update on current diagnostic approaches and optimal treatment strategies. It gives comprehensive information on gastric cancer not neglecting the basic sciences, which can shed light on the carcinogenesis mechanisms involved in this pathology. The principles of tailored and multimodal treatment are examined according to the latest guidelines with the aim of providing a valuable synopsis for clinicians.