Zhang et al. [25] demonstrated that high levels of miR-221/222 expression in gliomas confer highly aggressive invasion and poorer overall survival through by targeting TIMP3 and act as prognostic factors for glioma patients; Cristina et al. reported that overexpression of miR-221/222 produces an increase in sensitivity to temozolomide via a reduction in the level of MGMT. This evidence concerns the gene MGMT and central nervous system cancer.