• GartonAndrew L AALA1Department of Neurological Surgery, NewYork-Presbyterian Hospital/Weill Cornell Medical Center., Connor J Kinslow, Ali I Rae, Amol Mehta, Susan C Pannullo, Rajiv S Magge, Rohan Ramakrishna, Guy M McKhann, Michael B Sisti, Jeffrey N Bruce, Peter Canoll, Simon K Cheng, Adam M Sonabend, and WangTony J CTJC2Department of Radiation Oncology, Vagelos College of Physicians and Surgeons, NewYork-Presbyterian Hospital/Columbia University Irving Medical Center, New York, New York.7Herbert Irving Comprehensive Cancer Center, Vagelos College of Physi.
• 1Department of Neurological Surgery, NewYork-Presbyterian Hospital/Weill Cornell Medical Center.
• J. Neurosurg. 2021 May 1; 134 (5): 135713671357-1367.

ObjectiveGenomic analysis in neurooncology has underscored the importance of understanding the patterns of survival in different molecular subtypes within gliomas and their responses to treatment. In particular, diffuse gliomas are now principally characterized by their mutation status (IDH1 and 1p/19q codeletion), yet there remains a paucity of information regarding the prognostic value of molecular markers and extent of resection (EOR) on survival. Furthermore, given the modern emphasis on molecular rather than histological diagnosis, it is important to examine the effect of maximal resection on survival in all gliomas with 1p/q19 codeletions, as these will now be classified as oligodendrogliomas under the new WHO guidelines. The objectives of the present study were twofold: 1) to assess the association between EOR and survival for patients with oligodendrogliomas in the National Cancer Database (NCDB), which includes information on mutation status, and 2) to demonstrate the same effect for all patients with 1p/19q codeleted gliomas in the NCDB.MethodsThe NCDB was queried for all cases of oligodendroglioma between 2004 and 2014, with follow-up dates through 2016. The authors found 2514 cases of histologically confirmed oligodendrogliomas for the final analysis of the effect of EOR on survival. Upon further query, 1067 1p/19q-codeleted tumors were identified in the NCDB. Patients who received subtotal resection (STR) or gross-total resection (GTR) were compared to those who received no tumor debulking surgery. Univariable and multivariable analyses of both overall survival and cause-specific survival were performed.ResultsEOR was associated with increased overall survival for both histologically confirmed oligodendrogliomas and all 1p/19q-codeleted-defined tumors (p < 0.001 and p = 0.002, respectively). Tumor grade, location, and size covaried predictably with EOR. When evaluating tumors by each classification system for predictors of overall survival, facility setting, age, comorbidity index, grade, location, chemotherapy, and radiation therapy were all shown to be significantly associated with overall survival. STR and GTR were independent predictors of improved survival in historically classified oligodendrogliomas (HR 0.83, p = 0.18; HR 0.69, p = 0.01, respectively) and in 1p/19q-codeleted tumors (HR 0.49, p < 0.01; HR 0.43, p < 0.01, respectively).ConclusionsBy using the NCDB, the authors have demonstrated a side-by-side comparison of the survival benefits of greater EOR in 1p/19q-codeleted gliomas.

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