GPNMB and late-onset Parkinson disease: Results: Kruskal-Wallis test and logistic regression model failed to reveal an association between GPNMB rs156429 and scores from Montreal Cognitive Assessment (MoCA) (p = 0.037; p = 1.000 after correction), and pain symptoms of 511 PD patients (p = 0.008, OR = 0.59, 95% CI = 0.40–0.87, overdominant model after adjustment; p = 0.168 after correction, overdominant model after adjustment).