To assess the frequency allele and genotypic distribution of polymorphism rs165599 in catechol-O-methyltransferase in Kinh ethnic-patients with schizophrenia. Subjects and methods: A case-control study consisted of 227 schizophrenic patients and 92 healthy controls in the Kinh ethnic. | Polymorphic characteristics of RS165599 in comt gene in schizophrenia patients in Kinh population