A case-control study, in 599 European PD patients and controls, detected no relevant association between three ABCB1 variants and PD, while it found that the distribution of c.3435C>T differed significantly between PD patients exposed to pesticides compared to those nonexposed (OR = 4.74, 95% CI [1.01–22.31]) [48]. This evidence concerns the gene ABCB1 and Parkinson disease.