Abstract
Subcutaneous injection of DL-serine increased the number and size of renal tubular cell tumors in male W rats treated with 500 or 1,000 ppm N-ethyl-N-hydroxyethylnitrosamine [(EHEN) CAS: 13147-25-6, 2-(ethylnitrosamino)ethanol]. At the end of the 32-week experiment, the incidences of renal tumors were 95% in rats treated with 1,000 ppm EHEN for 2 weeks and then given three sc injections of DL-serine every 2 weeks, 33% in rats treated with 1,000 ppm EHEN for 2 weeks, and 28% in rats treated with 500 ppm EHEN for 2 weeks and then given three sc injections of DL-serine every 2 weeks. No renal tumors were found in rats treated with 500 ppm EHEN alone or given three sc injections of DL-serine alone every 2 weeks.
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