Lee et al. (35) considered 12 studies in the case of the BDNF 196 G/A polymorphism, and the meta-analysis showed no association between PD and the BDNF 196A allele in all study subjects, however, ethnicity-specific meta-analysis identified an association between the BDNF 196 AA+AG genotype and PD in Europeans, but not in Asians. The gene discussed is BDNF; the disease is Parkinson disease.