title: Cell proliferation of colonic neoplasms in dimethylhydrazine-treated rats.
abstract: We have measured mitotic indices and 3H-thymidine-labelling indices for the colonic epithelial tumours induced in rats by the administration of dimethyl-hydrazine (DMH). The fraction-of-labelled-mitoses (FLM) technique has been used to estimate the duration of the cell-cycle phases. In general, mitotic and labelling indices in the tumours are similar to those in the proliferation zone of the normal crypt epithelium; lesions considered to be least well differentiated on histological grounds appear to have the lowest mean labelling index. Benign tumours and the different types of malignant tumours have mean cell-cycle times about half those of the normal mucosa.
mesh_terms: D000818:Animals; D002453:Cell Cycle / Q000187:drug effects; D003110:Colonic Neoplasms / Q000139:chemically induced / Q000473:pathology*; D004127:Dimethylhydrazines; D005260:Female; D008938:Mitosis / Q000187:drug effects; D008940:Mitotic Index / Q000187:drug effects; D009374:Neoplasms, Experimental / Q000139:chemically induced / Q000473:pathology; D051381:Rats; D013997:Time Factors
chemical_list: D004127:Dimethylhydrazines