The vast majority of patients treated for malignant gliomas with surgery, conventional radiation therapy, and systemic chemotherapy recur within 2 cm of their original disease site as documented by CT scanning. We have analyzed the clinical patterns of failure in patients treated with stereotactic interstitial irradiation (brachytherapy) for malignant gliomas in order to determine if this modality has altered the recurrence pattern in this disease. Between December 1985 and December 1989, 53 patients with malignant glioma were treated with stereotactic interstitial irradiation using temporary high activity iodine-125. Thirty-three patients were treated as part of a primary treatment protocol that included 5940 cGy external beam prior to implantation. Twenty patients were treated at time of recurrence. The median dose of radiation given at implantation was 5040 cGy for the primary lesions and 5450 cGy for the recurrent lesions. Twenty-two patients have suffered relapse as documented by clinical and radiographic studies. The predominant patterns of failure in these 22 patients were in the margins of the implant volume (8) and distant sites (10) within the CNS (distant ipsilateral or contralateral hemisphere, spinal axis) or extraneural. Thus, marginal and distant recurrences accounted for 82% of the relapses in our patients. We conclude stereotactic interstitial irradiation has changed the recurrence pattern in patients with malignant glioma with true local recurrence no longer being the predominant pattern of failure as is seen with conventional therapy.
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