Abstract
Background
The role of radiotherapy and chemotherapy in the treatment of low-grade gliomas (LGG) is controversial regarding their effect on survival and the development of neurotoxicity. The few published studies examining adverse treatment effects on cognition revealed conflicting results.
Objective
To assess cognitive functioning in LGG patients who received conformal radiation therapy (RT), chemotherapy, or no treatment.
Design
40 LGG patients participated in the study; 16 patients had RT ± chemotherapy, and 24 patients had no treatment. All patients underwent a neuropsychological evaluation. APOE genotype was obtained in 36 patients who were classified in two groups based on the presence or absence of at least one apolipoprotein E є-4 (APOE є-4) allele.
Results
Treated LGG patients had lower scores than untreated patients on several cognitive domains; patients who completed treatment at intervals greater than 3 years and had long disease duration had significantly lower scores on the Non-Verbal Memory domain. Antiepileptic polytherapy, treatment history, and disease duration jointly contributed to low Psychomotor domain scores. 62% of treated patients showed white matter confluence on MRI, whereas only 9% of the untreated patients had such changes. Preliminary comparisons between APOE є-4 carriers (n = 9) and non-carriers (n = 27) on cognitive domain scores revealed no statistically significant differences, but APOE є-4 carriers had lower mean scores on the Verbal Memory domain than did non-є-4 carriers.
Conclusions
RT ± chemotherapy, disease duration, and antiepileptic treatment contributed to mild cognitive difficulties in LGG patients.
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Acknowledgments
The authors thank Aviva Glass, Angeles Cheung, and Jocelyn Dantis for their assistance with data acquisition and management.
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Supported by a research grant from the Charles Dana Foundation to Dr. Denise D. Correa.
Presented in part at the American Academy of Neurology Annual Meeting in April 2004, and at the World Federation of Neuro-Oncology (WFNO) II/ European Association for Neuro-Oncology VI Meeting in May 2005.
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Correa, D.D., DeAngelis, L.M., Shi, W. et al. Cognitive functions in low-grade gliomas: disease and treatment effects . J Neurooncol 81, 175–184 (2007). https://doi.org/10.1007/s11060-006-9212-3
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DOI: https://doi.org/10.1007/s11060-006-9212-3