DRD2 and autoimmune pancreatitis: A study by Gunes A. et al. (2007) found no statistically significant associations between the carriage of Taq1A1, 311Cys, and -141CDel polymorphisms of the DRD2 gene with the risk of developing AIP in comparison with groups of schizophrenic patients with and without AIP on the perphenazine therapy.