KISS1 and polycystic ovary syndrome: Others showed no significant difference between PCOS and control, such as Ozay et al. [19] with kisspeptin levels 1.92 ± 1.29 vs. 1.49 ± 1.46; p value = 0.638 [19], all these indicate that kisspeptin had good potential as a marker for PCOS diagnosis.