QLTI-04. UPDATE ON HIGH-GRADE GLIOMA PATIENTS TREATED WITH TTFIELDS FROM NANFANG HOSPITAL IN CHINA

Abstract OBJECTIVE Tumour-treating fields (TTFields) have changed the first-line clinical practice of glioblastoma worldwide due to their promising therapeutic efficacy. The aim of this study was to investigate the clinical efficacy of TTFields therapy for HGG in Nanfang Hospital, China. In 2023 ASNO we reported PFS.Now we reporte update about OS from our single center study. METHODS From January 2019 to December 2022, a total of 25 patients with newly diagnosed HGG (ndHGG) treated with TTFields were retrospectively included in our study. Among these patients, 9 patients received concurrent radiochemotherapy in combination with TTFields and 16 patients received non-concurrent chemoradiotherapy in combination with TTFields. The primary endpoint of the study was mPFS and mOS (Kaplan-Meier method used to estimate PFS and OS survival curves). Secondary endpoint was the influences about KPS score in PFS and OS. RESULTS The 25 ndHGG patients treated with TTFields included nine males and sixteen females with a mean age of 47.1 years (12-68). Gross total resection (GTR) was performed in eighteen patients. Twenty-one patients were IDH wild type, eleven patients showed methylation of the MGMT promoter. Followed up until January 2024, the median PFS was 13.3 months [95% CI: 11.33-15.2] with TTFields combined and 4.0 months (95% CI, 3.8-4.4) without TTFields treatment in EF-14.Median OS was 26.53 months [95% CI:19.47-33.57] with TTFields and 16.0 months (95% CI, 3.8-4.4) control in EF-14. In the KPS stratification, OS was 27.5 months (95% CI: 22.95-32.1) vs 4.3 months (95% CI: 0-11.2), p=0.0001. The OS of patients with concurrent chemoradiotherapy combined with TTFields vs. without concurrent chemoradiotherapy combined with TTFields was 26.5 months (95% CI: 24.33-28.7) vs 21.2 (95% CI: 3.1-39.3) months, p=0.59. CONCLUSIONS TTFields therapy is an effective treatment for HGG. In this study the addition of TTFields resulted in a statistically significant improvement in PFS and OS.