Hardcover. Condition: Very Good. No Jacket. First Edition. Explores the general etiologic factors in the pathogenesis of gastrointestinal cancers (i.e. the environment and genetic factors) and precancerous lesions of the esophagus, the stomach, the small intestine and the colon. Also explores screening principles and the value of endoscopy in the surveillance of high risk groups. Illustrated; indexed. Book.