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. 2019 May;6(3):209-217.
doi: 10.1093/nop/npy022. Epub 2018 Jul 9.

Seizure burden pre- and postresection of low-grade gliomas as a predictor of tumor progression in low-grade gliomas

Fernando Santos-Pinheiro  1 , Mingjeong Park  2 , Diane Liu  2 , Lawrence N Kwong  3 , Savannah Cruz  4 , Nicholas B Levine  5 , Barbara J O'Brien  1 , Merry Chen  1
Affiliations

Seizure burden pre- and postresection of low-grade gliomas as a predictor of tumor progression in low-grade gliomas

Fernando Santos-Pinheiro et al. Neurooncol Pract. 2019 May.

Abstract

Background: Low-grade gliomas (LGGs) are slow-growing, infiltrative tumors frequently associated with seizures. Predicting which patients will develop early tumor recurrence based on clinical indicators following initial surgical intervention remains a challenge. Seizure recurrence following surgery may be an early indicator of tumor recurrence, especially in patients presenting with increase in seizure frequency.

Methods: This study analyzed 148 patients meeting inclusion criteria (age >18 years, LGG diagnosis, at least 1 seizure event recorded before and after initial surgical intervention). All patients were treated at the Brain and Spine Center at The University of Texas MD Anderson Cancer Center from January 2000 to March 2013. Seizure frequency in a 6-month period before and after tumor resection was categorized as none, 1, few (2 to 3 seizures) or several (>3 seizures). Immediately postoperative seizures (up to 48 hours from surgery) were not included in the analysis.

Results: A total of 116 (78.4%) patients had seizures at initial presentation and most (95%) were started on antiepileptic drugs (AEDs). We found 2 clinical variables with a significant impact on progression-free survival (PFS): Higher seizure frequency during the 6-month postoperative period and seizure frequency increase between the 6-month pre- and the 6-month postoperative periods were both correlated to higher risk of early tumor recurrence (P = .007 and P = .004, respectively).

Conclusion: Seizure frequency following surgical resection of LGGs and the seizure frequency change between the 6-month preoperative and postoperative periods may serve as clinical predictors of early tumor recurrence in patients with LGGs who are also afflicted by seizures.

Keywords: low-grade glioma; refractory epilepsy; seizures; tumor outcome; tumor-related epilepsy.

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Figures

Fig. 1
Fig. 1
Kaplan-Meier curves for tumor progression-free survival (PFS) according to the following categorical variables: seizure-frequency preoperatively (preop), seizure-frequency postoperatively (postop), tumor location, surgery extension, seizure type before surgery, and seizure frequency change from 6 months prior to surgery to 6 months after surgery.
See this image and copyright information in PMC

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