CDX2 and polycystic ovary syndrome: Considering the significant discrepancy in the available literature data on the effects of vitamin D on AMH levels, we attempted to examine the relationship between the four functionally most relevant VDR polymorphisms (Fok1, Bsm1, Apa1, and Cdx2) as well as AMH and AMHR2 gene polymorphisms and their influence on AMH levels in PCOS women.