Carcinoids and adenocarcinoma of the glandular stomach in Praomys (Mastomys) natalensis treated with 3-methylcholanthrene.

Carcinoids and adenocarcinoma of the glandular stomach, analogous to those in man, were found in the chemically treated and control groups of Praomys (Mastomys) natalensis. The tumors were similar to the ones occurring spontaneously in this unique species. Adenocarcinoma of the pyloric and antral regions developed irrespective of treatment but of the fundic region only in the chemically treated group.