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BACKGROUND Glioblastoma is an aggressive primary central nervous system malignancy with poor prognosis and limited treatment options. Tumor treating fields (TTFs) are a novel treatment modality utilizing alternating electric fields that have demonstrated promise in randomized clinical trials for primary and recurrent glioblastomas. In addition to these studies, a multitude of smaller investigations have been performed examining their efficacy in a variety of combination therapies. This systematic review of available literature aims to summarize and evaluate the efficacy and safety of TTFs for primary and recurrent glioblastoma patients. METHODS A systematic review of the literature was performed according to PRISMA guidelines from database inception through 2/27/2019. Databases queried include PubMed, Embase, Cochrane, Scopus, Web of Science, and ClinicalTrials.gov. 856 unique studies were initially identified in this search, 9 of which met final inclusion criteria. 2 authors independently performed the screening and data extraction of the studies. RESULTS Excluding historical controls, 1569 patients were identified in these studies, 1191 of which received TTFs therapy. TTFs were evaluated in single-arm clinical trials (n = 2), randomized clinical trials (n = 2), and retrospective studies (n = 5). These 9 studies are presented based on treatments provided, baseline patient characteristics, and patient outcomes. No adverse events appear to be associated with TTFs other than adverse skin reactions. Given the heterogeneity in the presented studies, a quantitative meta-analysis was not performed. CONCLUSIONS TTFs are a novel treatment modality that have demonstrated safety and efficacy in a number of settings and study designs. However, further investigation is needed to continue characterizing treatment outcomes and assessing TTFs interactions with various drug regimens.

INNV-20. A SYSTEMATIC REVIEW OF TUMOR TREATING FIELDS THERAPY FOR PRIMARY FOR RECURRENT AND GLIOBLASTOMA