Journal
JOURNAL OF NEUROLOGY
Volume 251, Issue 12, Pages 1455-1464Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00415-004-0561-6
Keywords
low grade glioma; insula; interstitial irradiation; long term follow up
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Objectives To present long-term results after interstitial iodine-125 irradiation of adult patients with de-novo World Health Organization (WHO) Grade II astrocytomas and oligoastrocytomas of the insula of Reil with special respect to the treatment-related risk. Methods 55 consecutively treated patients (from 1979 to 1992) with circumscribed tumors with a diameter <5 cm (astrocytomas: 46 patients, oligoastrocytomas: 9 patients) were included. The reference dose - calculated to the outer boundary of the tumor - was in the range of 60-100 Gy and the dose rate was low (<10 cGy/h). Progression-free survival, risk of malignant transformation, survival, and the incidence of radiogenic complications were estimated by the Kaplan-Meier method. Prognostic factors were obtained from the Cox-model. Results Median follow up for the survivors was >10 years. 5-year (10-year) progression-free survival was 40.7 % (20.2 %), and 5-year (10-year) survival 54.6 % (28.4 %).Malignant transformation occurred in 42.4 % after 5 years. Neither of the Kaplan-Meier curves showed a leveling off over time. Transient (progressive) radiogenic complications were observed in 13 [4] patients (one-year overall complication rate: 18%), and were significantly associated with a tumor diameter >3.5 cm (p<0.001). No long term side-effects were detected and delayed external beam irradiation (in case of tumor progression) did not enhance the risk. Tumor enhancement on CT was the only unfavorable predictor for survival. Conclusion A limited overall prognosis for adult patients with insular WHO grade II astrocytomas and oligoastrocytomas was detected. Interstitial I-125 irradiation offers a minimal-invasive and low-risk treatment option for circumscribed tumors with a diameter <3.5 cm. Larger tumors require further evaluation for optimal treatment.
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