DRD2 and neuroendocrine neoplasm: When analysing interrelationships with several typical markers of, and receptors for, neuroendocrine tumours determined on the same set of samples as part of previous studies [6,7,8], a correlation was found between the IRS of FAM159B and the IRS values of the dopamine receptor D2, somatostatin receptors (SST)1, 3, 4 and 5, chemokine receptor CXCR4 and programmed death ligand 1 (PD-L1) (Table 2).