NOTCH1 and glioma: Many studies have shown that Notch1 is involved in the tumor growth, metastasis, drug resistance and recurrence of a variety of tumors, especially its close relationship with glioma stem cells.[39, 40, 41, 42, 43] In this study, we speculated that Notch1 could be a key molecule in the TMZ resistance of gliomas and subsequently constructed Notch1 knockout GL261 cell lines.