Gastrointestinal tumors observed in nonhuman primates at the German primate center

Twenty-six gastrointestinal tumors were observed in twenty-three nonhuman p rimates during routine necropsies at the German Primate Center, Gottingen. The majority (15 cases) were colorectal mucoid adenocarcinomas in cotton-to p tamarins (Saguinus oedipus), which in two animals were associated with ga stric adenomas. Three cases of small intestinal mucoid adenocarcinomas occu rred in common marmosets (Callithrix jacchus). One colonic leiomyoma was ob served in a dwarf galago (Galagoides demidovii) and another one in a cotton top tamarin. Singular findings were a tubular adeno-carcinoma of the ileo- caecal valve in a saddle-backed tamarin (Saguinus fuscicollis) and a lympho sarcoma of jejunum, ileum, and colon in another saddle-backed tamarin. Mult iple tubular adeno-carcinomas of the colonic diverticles occurred in an age d rhesus monkey (Macaca mulatta). The findings are discussed in comparison to the situation in man.