The action of a new male hormone, the flusterone (9 α fluorine-11β hydroxi-17 methyltestosterone), has been studied on « in vitro » cultures of spontaneous mammary adenocarcinoma of the C3H mouse strain, and compared with that exerted by methyltestosterone and testosterone at the same concentrations. The three tested hormones showed a growth inhibiting action at the concentration of 100 γ/ml, slighter for methyltestosterone and testosterone and rather more marked for flusterone.
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