The treatment of hepatocellular carcinoma (HCC) has made progress due to immune checkpoint inhibitors (ICIs), but still many patients present innate or acquired resistance to ICIs, thus there is a need for the discovery of new therapeutic approaches for HCC treatment. Epigenetic alterations play a key role in liver cancer, so that they can suppress the expression of proteins involved in triggering the immune response against tumors. Spanish researchers have now identified a promising target for liver HCC treatment, named histone-lysine N-methyltransferase EHMT2, also known as protein G9a.