Results for GSTs showed that individuals carrying the GSTM1-present, GSTT1-null, rs156697/AG + GG GSTO2), and rs1695/AA (GSTP1) genotypes displayed an increased resistance to PD (P = 0.003, OR = 0.348, 95% CI = 0.171–0.706), wherein a gender-dependent effect was observed with significance in females (P = 0.003) but not in males (Table 3). Here, GSTM1 is linked to Parkinson disease.