Nevertheless, many more studies revealed that there was no association between AR-GGN repeat length and male infertility.18,59,67 When the joint of CAG and GGC was taken into consideration, 2 haplotypes (CAG = 21/ GGC = 18, CAG ≥21/GGC ≥18) could make the risk of male infertility increase.18 Whether (GGN)n polymorphism could influence the function of androgen receptor remains to be fully studied. The gene discussed is AR; the disease is male infertility.