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Differences in treatment patterns and overall survival between grade II and anaplastic pleomorphic xanthoastrocytomas

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Abstract

Introduction

Pleomorphic xanthoastrocytomas (PXAs) are classified as a grade II neoplasm, typically occur in children, and have favorable prognoses. However, their anaplastic counterparts remain poorly understood and vaguely characterized. In the present study, a large cohort of grade II PXA patients were compared with primary anaplastic PXA (APXA) patients to characterize patterns in treatment and survival.

Methods

Data were collected from the National Cancer Institute’s SEER database. Univariate and multivariate Cox regressions were used to evaluate the prognostic impact of demographic, tumor, and treatment-related covariates. Propensity score matching was used to balance baseline characteristics. Kaplan–Meier curves were used to estimate survival.

Results

A total of 346 grade II PXA and 62 APXA patients were identified in the SEER database between 2000 and 2016. Kaplan–Meier analysis revealed substantially inferior survival for APXA patients compared to grade II PXA patients (median survival: 51 months vs. not reached) (p < 0.0001). After controlling across available covariates, increased age at diagnosis was identified as a negative predictor of survival for both grade II and APXA patients. In multivariate and propensity-matched analyses, extent of resection was not associated with improved outcomes in either cohort.

Conclusions

Using a large national database, we identified the largest published cohort of APXA patients to date and compared them with their grade II counterparts to identify patterns in treatment and survival. Upon multivariate analysis, we found increased age at diagnosis was inversely associated with survival in both grade II and APXA patients. Receipt of chemoradiotherapy or complete surgical resection was not associated with improved outcomes in the APXA cohort.

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Authors and Affiliations

  1. Department of Neurosurgery, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, CA, 94305, USA

    Adrian Rodrigues, Hriday Bhambhvani, Zachary A. Medress, Shreya Malhotra & Melanie Hayden-Gephart

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  1. Adrian Rodrigues
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Correspondence to Melanie Hayden-Gephart.

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Rodrigues, A., Bhambhvani, H., Medress, Z.A. et al. Differences in treatment patterns and overall survival between grade II and anaplastic pleomorphic xanthoastrocytomas. J Neurooncol 153, 321–330 (2021). https://doi.org/10.1007/s11060-021-03772-0

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  • DOI: https://doi.org/10.1007/s11060-021-03772-0

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