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OBJECTIVES This single institution retrospective study aims to evaluate the association between body mass index (BMI) and survival in glioblastoma (GBM). METHODS Patients were identified using a single institution cancer registry. Baseline height and weight were obtained at first clinical visit after diagnosis. Inclusion criteria were GBM diagnosis after 1999 with available height and weight data. Follow up was through July 2018. RESULTS 779 patients were included who had available BMI data. Median age was 58 (IQR 48–66). 38% of patients were female and 62% were male. Median overall survival (OS) was 1.34 years (IQR 0.78–2.12) and median BMI was 26.01 (IQR 23.3–29.1). There was no strong linear correlation between OS and BMI using Pearson correlation (r=0.045). Patients with higher BMI had significantly improved OS when comparing the top 50% to bottom 50% (2.20 vs 1.89 years, p=0.03) and top 25% to bottom 25% (2.25 vs 1.84 years, p=0.03). When comparing patients classified as overweight or obese (BMI &gt;/= 25) to those within normal range or below (BMI &lt; 25), there was a trend towards increased OS (2.14 vs 1.90 years, p=0.075). There was no significant trend for BMI when comparing patients with higher OS with lower OS. There was also no significance for BMI on Cox proportional hazard multivariate analysis. CONCLUSIONS There was no significant linear correlation between BMI and survival for GBM patients, although there appears to be statistically significant improved survival benefit for patients with higher BMI compared to patients with lower BMI. Further investigation is warranted to explore this finding and if BMI could be used as a potential prognostic marker for GBM.

HOUT-07. ASSOCIATION BETWEEN BASELINE BODY MASS INDEX (BMI) AND OUTCOMES FOR PATIENTS WITH GLIOBLASTOMA