GREB1 and endometriosis: The study, which is a systematic review of GWAS studies published by PubMed until December 31, 2019, indicates that variants of the genes WNT4 rs7521902, GREB1 rs13394619, FN1 rs1250248, IL1A rs6542095 and VEZT rs10859871 may affect the development of endometriosis.