To easily measure the concentration of apoA2-i, we previously developed sandwich enzyme-linked immunosorbent assay (ELISA) kits for Research Use Only (RUO) [8] and demonstrated the clinical application of the ELISA RUO kit for apoA2-i in several clinical studies focusing on the early detection of pancreatic cancer and HRIs [8]. Here, APOA2 is linked to pancreatic neoplasm.