rs7521902 (WNT4): Patients with endometriosis did not have an increase in genotypic or allelic frequency of this polymorphism compared to the control group (p = 0.3088, OR = 0.4133, 95% CI, 0.10–1.8 and p = 0.3297, OR = 2257, 95% CI, 0.55–914, respectively, for heterozygous genotype CA and polymorphic minor allele A) (Table 7, Figure 3). This evidence concerns the gene WNT4 and endometriosis.