DNMT1 and glioblastoma: In 16 GBM expressing similar level of Dnmt1, we noted that the levels of pDnmt1S127 and/or pDnmt1S143 were inversely correlated with the level of mMTase harbored by the corresponding GBM (Pearson's correlation test, r = −0.535, p = 0.0327; r = −0.531, p = 0.0343) (Figure 5B).