PRMT7 and cancer: Compared to other PRMTs, PRMT7 and PRMT9are relatively underinvestigatedand, although they have been recently identified as potential therapeutictargets for the treatment of various diseases, including differenttypes of cancer,18,19,22−24, 25 much is still to beunderstood on their biological roles, as well as on the structuralrequirements that could drive the development of selective modulatorsof their methyltransferase activity.