USP7 and hepatocellular carcinoma: Herpes virus‐associated ubiquitin‐specific protease is overexpressed in various human cancer types, including prostate cancer, multiple myeloma tumours, neuroblastoma, epithelial ovarian cancer, non‐small cell lung cancer, breast cancer, hepatocellular carcinoma (HCC) and lymphocytic leukaemia.1, 2, 3, 6, 7, 8 Conversely, the negative regulation of HAUSP exhibits a crucial clinical significance for estimating the prognosis of tumour suppression.5, 7 Thus, identification of HAUSP inhibitors is imperative for the therapeutic intervention of cancer.