The effect of added dietary tryptophane on the occurrence of diethylstilbestrol-induced mammary cancer in rats.

\ comparative study by White, White, and Mider (8) of the effect of a restriction of cystine, lysine, and tryptophane in the diet of dba mice showed that the development of methylcholanthrene-induced leukemia was inhibited by a re striction in cystine but was unaffected by a re striction in the essential amino acids, lysine, and tryptophane. A previous study by White and Andervont (7) showed that the restriction of dietary cystine completely inhibited the formation of spontaneous mammary cancer in C3H mice and that mice on a high-cyst ine diet developed mam mary cancer in the same proportion as C3H mice on a Purina Dog ('how diet. The average latent