NOD2 and Parkinson disease: It is also interesting that a study reported that three variants (R702W, 908R, and 1007fs) of NOD2 were significantly associated with PD in a Polish population (Bialecka et al., 2007), although this was not found in a German (Appenzeller et al., 2012) or a Chinese PD cohort (Ma et al., 2013).