we conclude that mnan ingestion for 12 weeks reliably produces papillomas and squamous cell carcinomas throughout the rat esophagus , but not in the squamous-lined forestomach , and that mnan stimulated marked epithelial proliferation which is accompanied by thickening of the epithelium in nontumorous esophageal mucosa .
C0030354
papillomas
C0014609
epithelium