SLC18A1 and neoplasm: The original tumor cells were positive for 5-HT, substance P, VMAT1/2, and markers for neuroendocrine phenotype, namely CgA, SYP, SV2, and NCAM, via IHC; the original tumor and the derived cell line also expressed somatostatin receptors, including SSTR2, which are the main treatment targets for these malignancies.