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Management of oligodendrogliomas
K T Shimizu1, L M Tran, R J Mark
1Department of Radiation Oncology, University of California, Los Angeles 90024-6951.
Radiology
|February 1, 1993
Summary
Optimal treatment for oligodendrogliomas involves considering patient age, tumor grade, and calcifications. Postoperative radiation therapy significantly improves survival, especially after subtotal resection, with predominantly local recurrence patterns observed.
Area of Science:
- Neuro-oncology
- Neurosurgery
- Radiation Oncology
Background:
- Oligodendrogliomas are rare brain tumors requiring defined treatment strategies.
- Understanding recurrence patterns and prognostic factors is crucial for patient outcomes.
Purpose of the Study:
- To determine optimal treatment protocols for oligodendrogliomas.
- To delineate recurrence patterns and identify prognostic factors for these tumors.
Main Methods:
- Retrospective review of 49 patients treated between 1957 and 1990 with at least 5 years follow-up.
- Statistical analysis (chi-squared, Wilcoxon log-rank tests) of prognostic factors including age, CT, tumor characteristics, and radiation therapy.
- Meta-analysis of relevant literature.
Main Results:
- Actuarial survival rates at 5, 10, and 15 years were 61%, 41%, and 24%.
- Recurrence was predominantly local (97%).
- Statistically significant prognostic factors included younger age (<40), low-grade tumors, calcifications, and CT use. Postoperative radiation therapy showed a trend toward improved survival, becoming significant with subtotal resection (74% vs 25%). Meta-analysis confirmed survival advantage for surgery plus radiation therapy.
Conclusions:
- Younger age, low-grade histology, calcifications, and CT imaging are favorable prognostic indicators for oligodendroglioma patients.
- Postoperative radiation therapy, particularly after subtotal resection, significantly enhances survival rates.
- Local recurrence is the primary pattern, emphasizing the importance of localized treatment strategies.