Serum IGFBP7 levels in patients at different phases of the menstrual cycle (A) and with endometriosis (B). (A) The sera from 62 women with regular menstrual cycles were tested. The numbers in parentheses indicate the number of subjects at each stage. (B) The sera from 11 patients with endometriosis were tested along with those of the 62 women with regular menstrual cycles, described for A, who served as controls for this study (Control). Data represents the means ± SE. *P < 0.05 as compared to Control.