GPX4 and endometriosis: In the codominant genotypic test model, the CC, CT and TT genotype frequencies of GPX4 (rs713041) were 33 (36.7%), 38 (42.2%) and 19 (21.2%) in endometriosis cases, and 22 (16.9%), 72 (55.4%), 36 (27.7%) in the control group, respectively (p = 0.004, X2 test).