There were no significant differences in TET1 (p = 0.1322), TET2 (p = 0.2434) and TET3 (p = 0.8208) mRNA levels between glioblastoma Grade IV-low5-hmC and Grade IV-high5-hmC (Figures 2B, D, F). This evidence concerns the gene TET1 and glioblastoma.