ITGAV and gastric adenocarcinoma: These results suggest that NPC2 and ITGAV may be useful as novel pathological staging markers for LIHC, PAAD, and STAD; nevertheless, it would be noteworthy to elucidate further the mechanism by which NPC2 and ITGAV are only linked with LIHC, PAAD, and STAD prognosis or pathological staging.