Objective To determine the effects of estrogen activation in the G-protein coupled estrogen receptor( GPER) mediated-6 / STAT3( GPER / IL-6 / STAT3) signaling pathway on the cell proliferation in breast cancer SKBR-3 cells. Methods 17-β-estradiol( E2),GPER specific agonist( G1),GPER specific antagonist( G15),human IL-6-neutralizing antibody( anti-IL-6) and STAT3 signaling specific inhibitor( cucurbitacin I, JSI-124) were used respectively to treat SKBR-3 cells. So the cells were accordingly assigned into th...