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OBJECTIVES Tumor Treating Fields (TTFields) has been approved for the treatment of newly diagnosed and relapsed glioblastomaGBMin China in 2020. Only few TTFields data in Asia patients were reported. This retrospective analysis is aimed at investigating the efficacy, safety and the potential relationship with biomarkers of TTFields treatment in the real-world clinical practice of the Chinese glioma population. METHODS High-grade glioma patients who were under TTFields treatment from May 2019 to May 2021 in Shanghai Huashan Hospital were analyzed, including baseline data, efficacy data and incidence of adverse events. RESULTS Eighty-two patients (median age 51.0 [26.0 - 47.0] years) with high-grade glioma were enrolled, including 60 newly diagnosed GBM, 16 recurrent GBM, and 6 WHO grade III gliomas. The median time was 9.9 (4.6-15.7) months for follow-ups, median time for TTFields treatment was 4.3(1.1-20.35) months. The median compliance rate was 90% (40%-97%). For newly diagnosed GBM (n=60) and recurrent GBM (n=16), the 6-month PFS rate were 78.4% (95%CI: 63.9-87.6) and 46.7% (95%CI: 21.2- 67.8) respectively. The 10-month OS rate were 86.3% (95%CI: 69.6- 94.2) and 60.0% (95%CI: 12.6- 88.2) respectively. The 6-month PFS rate in the IDHw/TERTm population was 69.9% (95%CI: 45.9-84.9) and 78.3% (95%CI: 46.5-92.5) in the IDHw/TERTw patients with newly diagnosed GBM. 59(72%) patients had skin-related adverse reactions, and majority are grade 1-2 (grade 1-2, 69.5%; grade 3, 2.5%). CONCLUSIONS This is the 1st retrospective analysis done using TTFields in the treatment of high-grade gliomas in the Chinese population with the largest sample size. From our short follow up, TTFields appears good efficacy among GBM patients. The incidence of skin adverse reactions is higher comparable to published data, but mainly consisted of grade1-2. Long-term efficacy data need to be further followed-up.

NCOG-14. REAL-WORLD RETROSPECTIVE ANALYSIS OF TUMOR TREATING FIELDS IN THE TREATMENT OF HIGH-GRADE GLIOMA BASED ON CHINESE POPULATION