Erie Fast Rubine Conc. B., one out of five sulfonated azo dyes tested, was found to be readily stored in reticulo-endothelial cells of mice. Injections of this dye into mice caused a temporary inhibition of the development of sarcoma induced by methylcholanthrene in C57 blacks and of a transplanted mammary carcinoma in C3H mice. An interpretation of these findings was presented.

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