Abstract
Following tumor resection, the majority of high-grade glioma (HGG) patients are treated with a combined modality regimen of radiotherapy and temozolomide. As a result of the tumor itself or as treatment-related neurotoxic side-effects, these patients may experience cognitive deficits. Additionally, radiological abnormalities expressed as white matter hyperintensities (WMH) and cerebral atrophy (CA) can develop. In this study, these functional and morphological parameters are evaluated, and their relation is investigated. After surgery, HGG patients underwent chemo-irradiation for six weeks, followed by six cycles of temozolomide. Assessments were performed before chemo-irradiation, post-concomitantly, after the third and sixth adjuvant cycle, and 3 and 7 months after treatment. Degree of WMH and CA was scored on MRI. Patients’ neuropsychological performance was compared to healthy matched controls, yielding six cognitive domain z-scores. Development or progression of pre-existing WMH and CA during follow-up was observed in 36 and 45 % of the patients (n = 39) respectively. Cognitive functioning remained stable or improved in 70 % of the patients and deteriorated in 30 % of the patients (n = 33). Of the cognitive decliners, 80 % had tumor progression within 4 months thereafter. No clear association between cognitive functioning and WMH or CA was found. Central neurotoxic effects of combined modality treatment in HGG patients expressed by radiological abnormalities are encountered in approximately 40 % of patients. However, functional impact as indexed by cognitive functioning was found to be limited. Furthermore, development or progression of pre-existing WMH and CA does not consistently result in functional impairment as measured by cognitive tests.
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Acknowledgments
We thank Lies Braam, Claudia Nijboer and Alieke Weerdesteijn for their participation in tracing patients and Wilmy Cleijne for her valuable help in testing patients.
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F. E. Froklage and L. J. Oosterbaan have made equal contributions to the manuscript. M. Klein and T. J. Postma have made equal contributions to the manuscript.
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Online Resource 1
Cognitive z-scores over time of the six cognitive domains. Psychomotor functioning (a), attention (b), information processing speed (c), working memory (d), verbal memory (e), and executive functioning (f). Circles represent first and last available time point per subject. Lines are dotted in the case of missing neuropsychological data before dropout
Online Resource 2
Average cognitive z-scores per time point of the six cognitive domains. T1 before the start of chemo-irradiation, T2 post-concomitantly, T3 after the third adjuvant temozolomide cycle, T4 after the 6th adjuvant temozolomide cycle, T5, 3 months after adjuvant treatment, T6 7 months after adjuvant treatment. Scores represent mean ± standard deviation. a One patient did not finish certain cognitive test(s) belonging to this domain. b Two patients did not finish certain cognitive test(s) belonging to this domain. c Four patients did not finish certain cognitive test(s) belonging to this domain
Online Resource 3
Generalized estimating equations analyses
Online Resource 4
Individual cognitive scores. T1 before the start of chemo-irradiation, T2 post-concomitantly, T3 after the third adjuvant temozolomide cycle, T4 after the sixth adjuvant temozolomide cycle, T5 3 months after adjuvant treatment, T6 7 months after adjuvant treatment. Scores represent mean ± standard deviation
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Froklage, F.E., Oosterbaan, L.J., Sizoo, E.M. et al. Central neurotoxicity of standard treatment in patients with newly-diagnosed high-grade glioma: a prospective longitudinal study. J Neurooncol 116, 387–394 (2014). https://doi.org/10.1007/s11060-013-1310-4
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DOI: https://doi.org/10.1007/s11060-013-1310-4