[Induced rat ovarian carcinoma showing mainly squamous components--an experimental approach to common epithelial tumors].

Female Wistar strain rats were treated with a chemical carcinogen DMBA (7,12-Dimethylbenz (a) anthracene) implanted directly into their ovary. In this method of tumor induction, adenocarcinoma commonly developed in the ovary by the direct carcinogenic effect of DMBA during a 30 weeks observation period. However, two cases of primary ovarian carcinoma showing mainly squamous components have been found in a recent experiments. The histological characteristics of these indicated that they were adenoacanthoma and adenosquamous cell carcinoma and both were derived ultimately from the ovarian surface epithelium with interposition of endometrioid type tumor. These two cases of experimental rat ovarian cancer consist of mainly squamous element are studied morphologically and their histogenesis is discussed.