BRD2 and polycystic ovary syndrome: Ultimately, 26 clinical trials with a total of 2722 participants were included in this multi-treatment meta-analysis; these trials explored the comparative efficacies of 9 therapies (CC, letrozole, metformin, metformin+letrozole, metformin+CC, ULOD, BLOD, FSH and hMG) for inducing mono-ovulation in CCR-PCOS patients13–38.