TNFRSF21 and hepatocellular carcinoma: The gene signature consists of 10 necroptosis-related genes (CDKN2A, HAT1, HSP90AA1, IPMK, KLF9, MYCN, NDRG2, PLK1, SQSTM1, and TNFRSF21), most of which are upregulated in HCC tumor tissues and are associated with poor prognosis.