Association of brain-derived neurotrophic factor (Val66Met) genetic polymorphism with methamphetamine dependence in a Malaysian population

►Significant difference was found in Chinese population for METH dependence. ►Significant difference was found in Chinese population for METH psychosis. ►66Val/66Val genotype of Val66Met polymorphism is a risk factor for METH dependence. ►66Met may contribute a vulnerability to METH psychosis in the Chinese population.