The textbook "Gastrointestinal Oncology" provides a comprehensive and up-to-date overview of modern diagnostic and therapeutic approaches in the treatment of tumors of the gastrointestinal tract. It is aimed at professionals in gastroenterology and offers valuable information on the most common conditions and their treatment options. The chapters are clearly structured and written by experts who specialize in their respective fields. This ensures a well-founded and interdisciplinary perspective that is essential for optimal patient care. Additionally, readers gain access to digital content through the knowledge platform eRef, allowing for flexible use of the information. The combination of theoretical knowledge and practical applications makes this work an indispensable companion for anyone involved in gastrointestinal oncology.