Objective To evaluate the effects of metformin therapy on the expressions of factor associated suicide(Fas)and Fas ligand in rat ovaries with polycystic ovary syndrome(PCOS)induced by DHEA so as to explore the molecular mechanism of metformin treatment of PCOS.Methods Totally 30 SD female rats aged85 days were randomly divided into PCOS group(n=10),metformin(dimethylbiguanide,DB)therapy group(n=10),and control group(n=10).DHEA hypodermic injection was adopted to establish PCOS rat model in the first two gro...