Tumor Treating Fields for Newly Diagnosed Glioblastoma: Two Emulated Trials With Chinese Multi-Hospital Based Real-World Data

The goal of this observational study is to learn about the effectiveness of Optune® (Tumor Treating Fields) in newly diagnosed glioblastoma (GBM) in China. The main question it aims to answer are: * The efficacy of Optune® as an concomitant/adjuvant to radiation therapy (RT) and temozolomide (TMZ) alone in the treatment of newly diagnosed GBM patients. * The effectiveness of Optune® given concomitantly with RT and TMZ in newly diagnosed GBM patients, compared to RT and TMZ alone. Participants will: * Receive or not receive TTFields. * Concomitantly or adjuvantly receive TTFields.