ST6GALNAC4 and neoplasm: Moreover, according to the CPTAC database, the protein level expression of CHP1 was lower and PPIA, ALG3, CTSA, CAD, B3GAT3, TRAPPC3, HSP90AA1, BAG2, DNAJC1, PLOD2, DYNC1LI1, and ST6GALNAC4 were significantly higher in tumor tissues.