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Background: Primary gliosarcoma is a rare malignant brain tumor with dismal prognosis. Previous reports are limited to case reports and small retrospective case series. Objective: To evaluate treatment and survival outcomes in a large cohort of primary gliosarcoma patients treated in the United States. Results: 1622 patients met the inclusion criterion. Median age was 63 years. The 3-year OS rate for the entire cohort was 11.9%. Patients aged 18 to 60 years were significantly more likely to receive trimodality therapy (defined as the use of surgery, radiotherapy [RT] and chemotherapy [CT]) than patients older than 60 (68.1% vs. 56.7%, p < 0.001). The utilization of trimodality therapy significantly increased during the study period (57.5% in 2004–2008 vs. 65.1% in 2009–2013; p = 0.002). On multivariate Cox regression analysis, GTR, surgery followed by RT and the use of trimodality therapy were associated with longer OS, while older age, Charlson-Deyo score ≥ 1 and multi-focal tumor were associated with shorter OS. The use of trimodality therapy was consistently associated with longer OS in subgroup analyses based on age and extent of resection. Materials and Methods: The National Cancer Database was used to identify all primary gliosarcoma patients aged 18 to 90 years who were diagnosed between 2004 and 2013. Overall survival (OS) was evaluated by Kaplan-Meir analysis, univariate and multivariate Cox proportional hazard regression analysis. Conclusions: The use of trimodality therapy significantly increased during the study period and was associated with improved outcomes regardless of age and extent of resection.

Assessment of treatment approach and survival outcomes in a modern cohort of patients with primary gliosarcoma using the national cancer database