USP22 and hepatocellular carcinoma: As a result, we found that tissue‐specific Usp22 overexpression accelerated tumorigenesis, whereas Usp22 ablation decelerated it in a c‐Myc/NRasGV12‐induced HCC mouse model and that the mammalian target of rapamycin complex 1 (mTORC1) pathway was activated downstream.