A cross-sectional case-control study has shown that ALDH2 genotype is associated with cognitive function among 139 Chinese patients with Parkinson’s disease (mean age: 63.0 years) (Yu et al., 2016), and another study has demonstrated its association among 411 Chinese with an average age of 77.4 years (Wang et al., 2008). This evidence concerns the gene ALDH2 and Parkinson disease.