In a study by Peculis et al., involving 143 cases and 354 controls, the role of SNPs in seven genes (SSTR2, SSTR5, DRD2, MEN1, AIP, GNAS, and PRKAR1A) was investigated, focusing on the association with the occurrence of pituitary tumors, phenotype, and clinical symptoms. Here, DRD2 is linked to pituitary tumor.