CGA and neuroendocrine neoplasm: In neuroendocrine neoplasms of gastrointestinal tract, higher expression levels in tumor relative to non-tumor tissue of > tenfold were found for CgA, 2—tenfold higher mRNA levels were found for CD56, β-catenin, PDX1, CK20, and P53 and 1—twofold higher mRNA levels were found in CD45 tumor tissue compared with the non-tumor tissue [40].