Understanding the essence of the tumor process and the mechanisms of carcinogenesis is one of the main tasks of modern oncology. Experimental studies play a leading role in the solution of these problems. Investigations into the possibilities of experimental induction of tumors in monkeys and examining the causes of their development are of great theoretical significance in oncoprimatology for comparative studies of human tumors. However, information on spontaneous and induced tumors is scarce and is scattered among numerous journals in different fields of study. This book features data from the literature, in addition to the author's own findings over the course of 30 years in the field of oncoprimatology. Spontaneous tumors of different localizations; tumors induced by organotropic carcinogens in the esophagus, stomach, and intestines; tumors of the kidneys after administration of dimethyl hydrazine; and tumors of the peripheral nervous system after administration of the neutropic carcinogen methyl nitrosourea are among the primary topics covered in this important volume.