DRD2 and neoplasm: Therefore, we screened for 5-HTR1B, 5-HTR2B, DRD1, and DRD2 mRNA overexpression in a large dataset with common and rare tumour types using functional genomic mRNA (FGmRNA) profiling and we determined protein expression and localization of the serotonin and dopamine receptors 5-HTR1B, 5-HTR2B, DRD1, and DRD2 in eight tumour types.