Prolactin, IGFBP-1, and IL-11 production by decidualizing endometrial stromal cells from fertile and infertile women. Levels of prolactin (A), IGFBP-1 (B), and IL-11 (C) in culture supernatants from confluent stromal cells isolated from fertile (■; n = 6) and primary infertility (▲;n = 10) patients treated with 8-Br-cAMP for 16 d. Data are expressed as the mean ± sem. P < 0.05 for fertile vs. primary infertility groups at each time point. PRL, Prolactin.