Thus, given these contradictory findings among different solid tumor entities, we aimed to broaden the experience of CXCR4-targeted PET imaging in solid cancers by investigating a subset of different tumors, including cholangiocarcinoma (CCC), hepatocellular carcinoma (HCC), pancreatic adenocarcinoma or neuroendocrine tumor, and ovarian cancer. This evidence concerns the gene CXCR4 and neuroendocrine neoplasm.