title: Renal tumors in rats given trisodium nitrilotriacetic acid in drinking water for 2 years.
abstract: One hundred and ninety-six albino male rats [Crl/COBS CD (SD) BR] were given 1,000 ppm trisodium nitrilotriacetic acid (NTA) in drinking water for 2 years. One hundred and ninety-two control rats were given water without NTA. Animals that had a palpable mass or that appeared clinically ill were killed. All survivors were killed at 704 days. A significantly (P less than 0.05) higher proportion of the NTA-treated rats vs. 11.2% of the controls). The largest difference between the NTA-treated rats and the controls in tumor incidence was associated with renal adenoma. The NTA-treated group contained 25 rats with renal adenomas and 4 with renal adenocarcinomas. Only 5 control rats had renal adenomas; none had renal adenocarcinomas. No statistically significant differences were observed for any of the other tumor types among the NTA-treated rats and the controls. The overall incidence of renal tubular cell hyperplasia and nephritis was similar in the treated and control groups. However, a significantly greater number of NTA-treated rats had more severe grades of hyperplasia. Thus NTA when administered continuously in drinking water at a concentration of 1,000 ppm is tumorigenic to the rat kidney.
mesh_terms: D000085:Acetates / Q000633:toxicity*; D000230:Adenocarcinoma / Q000139:chemically induced; D000236:Adenoma / Q000139:chemically induced; D000818:Animals; D002273:Carcinogens; D006965:Hyperplasia / Q000139:chemically induced; D007668:Kidney / Q000187:drug effects* / Q000473:pathology; D007672:Kidney Cortex / Q000473:pathology; D007680:Kidney Neoplasms / Q000139:chemically induced* / Q000473:pathology; D007687:Kidney Tubules, Proximal / Q000473:pathology; D008297:Male; D009374:Neoplasms, Experimental / Q000139:chemically induced; D009571:Nitrilotriacetic Acid / Q000633:toxicity*; D051381:Rats
chemical_list: D000085:Acetates; D002273:Carcinogens; D009571:Nitrilotriacetic Acid