Textbook of Gastrointestinal Oncology, written as one of the most comprehensive textbooks published in the world in the field of gastrointestinal oncology, was prepared under the editorship of Hacettepe University Cancer Institute Medical Oncology Faculty Member Prof. Dr. Şuayib Yalçın. Discussing in detail the basic principles and practices in gastrointestinal oncology; Covering a wide range of applications such as pathology and radiological images, epidemiology, genetics, staging, multidisciplinary management of specific gastrointestinal cancer, and pathology of primary tumor sites, this book consists of 716 pages. Book with keywords and key concepts and hundreds of high-quality images at the beginning of each chapter; It is also offered as a resource for medical oncologists, medical oncologists, surgeons, radiation oncologists, gastroenterologists.