MCCC1 and Parkinson disease: The first Han Chinese GWAS by Foo JN analyzed a total of 22,729 subjects (5,125 PD cases and 17,604 controls) from Singapore, Hong Kong, Malaysia, Korea, mainland China, and Taiwan and replicated associations at SNCA, LRRK2, MCCC1, and 14 other European PD loci but did not identify Asian-specific loci with large effects on PD risk (5).