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OBJECTIVE In the EF-14 phase 3 trial, TTFields 9200 kHz) added to maintenance TMZ increased median OS to 20.9 months versus 16.0 months with maintenance TMZ (p&amp;lt; 0.001) in ndGBM. Preclinical investigations showed that TTFields/RT have a synergistic effect. A pilot study (N=10) in ndGBM demonstrated the feasibility and safety of TTFields combined with RT/TMZ (Grossman Front Onc 2020). The only TTFields-related adverse event was array-associated skin toxicity. Median PFS was 8.9 months. Based on these encouraging results, this prospective, randomized phase 2 study [NCT03869242] in 60 patients further investigates if the addition of TTFields TMZ/RT treatment in ndGBM patients improves treatment efficacy and delays disease progression. METHODS Following debulking surgery or biopsy, 60 patients (≥18 years) with histologically confirmed GBM, KPS≥70 and life expectancy &amp;gt;3 months will be randomized 1:1 to: i) RT with concomitant TMZ/TTFields (200 kHz) for 6 weeks followed by up to 6 months of maintenance TMZ combined with TTFields (experimental arm) up to 24 months; or ii) RT with concomitant TMZ alone followed by maintenance TMZ combined with TTFields (control arm). Patients with early progressive disease, significant comorbidities precluding maintenance RT or TMZ or with implanted electronic devices will be excluded. The primary endpoint is the rate of progression free survival at 12 months (PFS12). Treatment with TTF will be continued until second progression or 24 months (the earlier of the two). All patients will be followed for survival. All adverse events will graded per CTCAE V5.0. The sample size of 60 patients provides 80% power with two-sided alpha level of 0.05 to detect a PFS12 of 46.5% with RT/TMZ/TTFields compared to 29.4% with RT/TMZ followed, respectively, by maintenance TMZ/TTFields (calculated from the RT/TMZ followed by maintenance TMZ/TTFields arm of the EF-14 trial). Follow-up will continue for &amp;gt;12 months from recruitment of the last patient.

neuro-oncology

RTID-12. PHASE 2 TRIAL OF TUMOR TREATING FIELDS (TTFIELDS) PLUS RADIATION THERAPY (RT) PLUS TEMOZOLAMIDE (TMZ) COMPARED TO RT PLUS TEMOZOLOMIDE IN NEWLY DIAGNOSED GLIOBLASTOMA (ndGBM)