document: U87MG cell transplantation, the treatment was repeated two times (every 7 days). In Group 7 (n = 10), the mice received TrQβ@b-3WJsiEGFR Let-7g (5 μM) via CED infusion at 9 A.M. followed by 2 Gy X-ray irradiation at 2 P.M. the following day. Seven days after U87MG cell transplantation, the treatment was repeated two times (every 7 days). The intracranial tumour volume in mice was measured by MR imaging. The survival time was calculated from the day of U87MG cell inoculation (0 day) to the day of