TNF and hepatocellular carcinoma: As our data showed that circUHRF1 effectively inhibited the function of miR-449c-5p to suppress NK cell secretion of IFN-γ and TNF-α, we speculated that circUHRF1 may be responsible for upregulating the expression levels of miR-449c-5p targets by acting as a miR-449c-5p sponge and enhancing immune evasion in HCC patients.