CCKBR and medullary thyroid gland carcinoma: Radiolabeled minigastrin analogues bind with high affinity to the cholecystokinin B receptor (CCKBR, also known as CCK2R), whose overexpression was previously demonstrated by a radioligand binding assay in human cancer tissue sections, including medullary thyroid cancer (MTC), small cell lung cancer, astrocytoma, and stromal ovarian cancer [1].