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Oral Presentations

2010 AANS Annual Meeting Philadelphia, Pennsylvania May 1–5, 2010

patient was unaccounted. The median preoperative tumor volume was 57.0 cm 3 and most tumors (N = 206) occupied eloquent territories. All patients underwent resection followed by chemotherapy and radiation therapy. The median postoperative tumor volume was 1.4 cm 3 , equating to a 98% EOR. The median overall survival was 12.2 months. Using Cox proportional hazards analysis, the following were predictive of survival: patient age, KPS, and EOR (p less than 0.0001). A significant survival advantage was seen with as little as 70% EOR, and stepwise improvement in survival