LEP and polycystic ovary syndrome: In a study with Takeuchi and Tsutsumi (21), serumleptin level in unexplained infertility groupwas higher compared to polycystic ovary syndrome(PCOS) group, but difference was not significant, whereas in a study with Demir et al. (22),comparison of serum leptin levels in unexplainedinfertile woman and fertile woman demonstratedsignificant higher serum leptin levels in unexplainedinfertile woman.