Investigations of the possibilities of experimental induction of tumours in monkeys and of the causes of their development are of great theoretical and practical significance for comparative studies of human tumours. The majority of researchers regard primates as the most valuable objects for the simulation of human pathology. This book features data from current literature on spontaneous and induced tumours, together with the author's own findings over the course of the last 30 years in the field of oncoprimatology. The text covers spontaneous tumours of different localizations; discusses tumours induced by organotrophic carcinogens obtained in the oesophagus, stomach and intestines; covers tumours of the kidneys, obtained in monkeys after administration of dimethyl hydrazine; and tumours of the peripheral nervous system after administration of neurotrophic carcinogen, methyl nitrosourea.