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Radiation-induced malignant gliomas: a current review
Aladine A Elsamadicy1, Ranjith Babu1, John P Kirkpatrick2
1Division of Neurosurgery, Department of Surgery, Duke University Medical Center, Durham, North Carolina, USA.
World Neurosurgery
|December 20, 2014
Summary
Radiation-induced malignant gliomas (RIMGs) are rare but possible after brain irradiation. The risk of RIMGs is consistent across patient age, tumor type, and radiation dose, emphasizing the need for patient awareness.
Area of Science:
- Neuro-oncology
- Radiation oncology
- Medical physics
Background:
- Radiation-induced malignant gliomas (RIMGs) are uncommon but serious sequelae of brain irradiation.
- Characterizing RIMGs is crucial for understanding their risk factors and clinical outcomes.
Purpose of the Study:
- To comprehensively review and characterize RIMGs.
- To analyze the relationship between radiotherapy (RT) dose, patient age, and latency period.
- To determine the radiation threshold for RIMG development and assess survival trends.
Main Methods:
- Literature review of RIMG cases via PubMed, supplemented by institutional cases.
- Statistical analysis including Pearson R correlation, Student t-test, and Kaplan-Meier survival analysis.
- Biologic equivalent dose calculations to establish radiation thresholds for neoplasia.
Main Results:
- Analysis of 176 RIMG cases (172 literature, 4 institutional) with a median RT dose of 35.6 Gy.
- Median latency period to RIMG diagnosis was 9 years; 82% occurred within 15 years post-irradiation.
- No significant correlation found between patient age or RT dose and RIMG latency period; mean biologic equivalent dose was 63.3 Gy.
- Median survival for RIMG patients improved significantly over time, from 9 months before 2007 to 11.5 months after.
Conclusions:
- RIMG risk is uniform across different age groups, histologies, and radiotherapy dosages.
- Patients undergoing brain irradiation should be informed about the potential risk of developing RIMGs.
- Despite low incidence, RIMGs represent a critical long-term complication of cranial radiotherapy.
