In medulloblastomas, REST expression could decrease cyclin-dependent kinase (CDK)NIB/p27 (a CDK inhibitor) by repressing ubiquitin specific peptidase 37 (USP37), which could form a complex with p27 to promote its deubiquitination and stabilization, and resulting in blocked cell proliferation [19]. Here, USP37 is linked to medulloblastoma.