This second edition of principles and practices of gastrointestinal oncology is a comprehensive in depth review of the commonest group of human cancers the editors and the chapter authors represent an international group of experts who are leaders in their respective fields. The initial section in this volumeprinciples of gastrointestinal oncology includes an expanded radiation oncology chapter an extensively revised cancer genetics chapter and a completely rewritten medical oncology chapter emphasizing new agents. The initial section principles of gastrointestinal oncology includes an expanded radiation . Gastrointestinal oncology principles and practice fills a tremendous need in the cancer treatment literature for a long time now there has been no updated textbook devoted to the complicated yet underserved field of gastrointestinal cancers