TET1 and renal carcinoma: In a previous study, we found that the compound fisetin suppressed Tet methylcytosine dioxygenase 1 (TET1) expression and reduced the 5hmC modification in specific loci in the promoters of CCNY (encoding cyclin Y)/CDK16 (encoding cyclin dependent kinase 16) in HuRSCs, which inhibited the transcription of these genes, causing cell cycle arrest and ultimately inhibiting renal cancer stem cell activity 4.