RTN4 and Parkinson disease: Here, we enrolled 3959 PD patients and 2931 healthy controls, categorized into two cohorts: the sporadic early Parkinson's disease & familial Parkinson's disease (sEOPD & FPD) cohort and the sporadic late Parkinson's disease (sLOPD) cohort, to identify the role of 17 Neurite Outgrowth Inhibitor‐associated genes.