Wang’s study of 2001 on Chinese women reported the influence of polymorphisms of the HLA-B gene, but not the HLA-A gene, on the susceptibility to the development of endometriosis [56], whereas Ishi in 2003 reported a significant association with HLA-DRB1*1403 and HLA-DQB1*03031 alleles in Japanese women, but not with HLADPB1 [57]. This evidence concerns the gene HLA-A and endometriosis.