CCKBR and small cell lung carcinoma: reported first studies on the human peptide hormone minigastrin (H-Leu-(GIu)5-Ala-Tyr-Gly-Trp-Met-Asp-Phe-NH2) and its diethylenetriaminepentaacetic acid (DTPA)-conjugated analog targeting the cholecystokinin-2 receptor (CCK-2R) [1], which is overexpressed in a high percentage on several human tumor types such as medullary thyroid carcinoma (MTC, 92%), small cell lung cancer (57%), stromal ovarian cancer (100%) and astrocytoma (65%) [2, 3].