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Neoplasms of preputial gland and skin were obtained from Fischer 344 male rats on lifetime drinking water studies of the benzidine congener 3,3′-dimethoxybenzidine, C.I. Direct Blue 15 or C.I. Acid Red 114, bisazobiphenyl dyes derived from 3,3′-dimethoxybenzidine and 3,3′-dimethylbenzidine. Portions of these well differentiated neoplasms were implanted into the left mammary fat pad of Fischer 344 male recipients. The rate of growth, presence of local invasion and distant metastases, and morphologic features were observed following 4 serial transplantations. All implants appeared early, grew rapidly, and were histomorphologically similar to the original neoplasms. Metastases from transplants were observed with both preputial gland and skin tumor lines in serial passages. The transplantation results confirm the malignant nature of these neoplasms.

toxicologic pathology

Transplantation Studies of Preputial Gland and Epithelial Skin Neoplasms Derived from Benzidine-Based Dye Carcinogenicity Assays in Fischer 344 Male Rats