Abstract
Introduction The effect of estrogens and androgens on some neoplasms of the human reproductive system, though unpredictable, has been sufficiently dramatic to warrant continued investigation. The growth rate of mammary carcinoma in particular appears to be subject to modification by these hormones in a substantial number of cases. The mechanism of action, however, is unknown. Strains of mice developing spontaneous mammary cancer in a high proportion of the females offer an appropriate laboratory preparation for the study of basic growth mechanisms involved. These tumors can be readily grafted into males of the same strain. Endogenous estrogen or androgen production can be reduced by castration in both sexes, and the influence of exogenous hormone on basic biochemical alterations is then more clearly defined. We have chosen to study the effect of 17β-estradiol and testosterone propionate on incorporation of P 32 into the total nucleic acids of these tumors. In a previous
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