CYP2B6 and endometriosis: Together with the evidences about the significant difference between BMSCs group and BMSCs-P450 siRNA group (△P < 0.05), as well as between BMSCs-P450 siRNA and BMSCs-P450 empty group (▲P < 0.05), the data highly suggested that the negative effects of BMSCs transplantation on endometriosis was most possibly via E2 secretion.