USP2 and hepatocellular carcinoma: Here, we introduce the structure and function of “USP14, USP1, USP10, USP39, USP22, USP9X, USP2, USP7, USP4, USP5, USP29, USP15, USP12, USP16, USP27, USP46, and USP8” in the USP family research progress in HCC.