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There is abundant interest in the potential therapeutic and supportive role of a ketogenic diet (KD) for glioblastoma patients. We conducted a single-arm phase 1 trial to assess the safety and feasibility of KD plus standard-of-care (SOC) in glioblastoma patients (NCT03451799). METHODS Adults within 3 months of diagnosis participated in a 16-week intervention of a classic 3:1 KD (grams fat : grams carbohydrate + protein) with dietitian support. Blood glucose and ketone levels were assessed twice daily (Keto-Mojo), with remote monitoring of daily weight and activity (Fitbit). The primary objective was to assess safety (weight stability, CTCAE) and feasibility (maintaining ketosis &amp;gt; 0.3mM for &amp;gt; 50% of study period). Secondary objectives included assessments of progression-free survival (PFS), overall survival (OS), health-related quality of life (HRQOL), and cognition (MoCA). RESULTS From 04/2018-02/2021, 14 patients were evaluable: female:male, 8:6, median age 55 years, KPS 80, BMI 24.5. MGMT promoter methylation: 6 present, 7 absent, 1 indeterminate. Adherence to KD was high, with all patients maintaining ketosis ( &amp;gt; 0.3mM) &amp;gt; 50% and 11 patients maintaining ketosis &amp;gt; 85% of study days. Adverse events (&amp;gt; Grade 2) potentially attributable to KD: appetite loss (Grade 2: 2); fatigue (Grade 2: 5); flu-like symptoms (Grade 2: 1); constipation (Grade 2: 5, Grade 3: 1). No patients were removed from study for safety reasons. HRQOL was stable, with improvements in role function (not statistically significant). MoCA score improved in 10/14 patients. Median PFS and OS from KD initiation were 11.7 and 29.1 months, respectively. CONCLUSION Our findings suggest that a supervised KD plus SOC is safe and feasible in glioblastoma patients. KD was well-tolerated with encouraging trends in HRQOL and cognition. PFS and OS in this small trial compare favorably to historical control. A multicenter phase 2 trial powered to assess efficacy is planned.

QOLP-04. THE KETOGENIC DIET PLUS STANDARD CARE FOR RECENTLY DIAGNOSED GLIOBLASTOMA: A PHASE 1 SAFETY AND FEASIBILITY TRIAL