Adenocarcinoma of the kidney. I. Ultrastructure of renal adenocarcinomas induced in rats by N-(4'-fluoro-4-biphenylyl)acetamide.

The ultrastructure of tumors induced in kidneys of F344 rats by the carcinogen N-(4'-fluoro-4-biphenylyl)acetamide appeared similar in many aspects to that described in humans and other animal models. The neoplastic cells exhibited microvilli resembling brush border and other adaptations of the cell membrane. Tumor lobules were surrounded by basement membrane-like material, which also extended into the tumor mass between individual cells. The ultrastructure appeared to reflect a proximal tubular origin of these lesions.