TRIM21 and hepatocellular carcinoma: Consequently, K7-ubiquitylated p62 loses its ability to sequester Keap1, establishing TRIM21 as a negative regulator of Nrf2-directed cytoprotective antioxidant responses and providing a possible mechanism explaining the observation that reduced TRIM21 expression is associated with poor prognosis in hepatocellular carcinoma and B cell lymphoma (Brauner et al., 2015; Ding et al., 2015).