TRAF2 and hepatocellular carcinoma: In line with human evidence, deletion of both TRAF2 and RIP1 in liver parenchymal cells (LPC) leads to spontaneous development of hepatocellular carcinoma, which results from extensive hepatocyte apoptosis due to hyperactivation of caspase-8 but impaired NF-κB activation induced by TNFα (Table 2) (43).