INACTIVATION OF STILBESTROL BY LIVER IN VITRO1

Abstract
Contrary to earlier results, stilbestrol is inactivated by liver pulp in vitro but less rapidly than is estrone. Within a specified time twice as much liver is required to inactivate stilbestrol as estrone. It is suggested that this finding explains the greater oral efficiency and the toxic side-effects of stilbestrol in man. In rats, treated with large amts. of stilbestrol, the capacity of the liver to inactivate stilbestrol is increased.

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