IR-192, LOW-DOSE RATE ENDOBRONCHIAL BRACHYTHERAPY IN THE TREATMENT OF MALIGNANT AIRWAY-OBSTRUCTION

Purpose: To assess the value of low-dose-rate endobronchial brachytherapy in the treatment of malignant airway obstruction. Methods and Materials: Between September 1986 and April 1989, 39 patients with malignant airway obstruction had 49 catheter placements for an afterloading, low-dose-rate Ir-192 endobronchial brachytherapy. A flexible fiberoptic bronchoscope with fluoroscopic guidance was used for positioning. Thirty-eight of 39 (97%) patients completed the prescribed treatments. Ninety-seven percent had received previous external radiation in doses ranging from 36-60 Gy. One patient had metastatic renal cell carcinoma; the remainder had recurrent lung cancer. Endobronchial laser treatments were given to three patients 2-3 weeks prior to endobronchial brachytherapy. All patients were followed until death. The median dose delivered in 48 of the 49 placements was 20 Gy at 1 cm. Results: Follow-up bronchoscopy was performed in 28 (72%) of 39 patients. Of these, 13 (46%) had a complete response, 12 (43%) had a partial response, and 3 (17%) had a minor response. Dyspnea improved in 30 of 37 patients (82%); hemoptysis in 17 of 19 patients (89%); cough in 31 of 39 patients (79%); and postobstructive pneumonia in 21 of 23 patients (92%). The median survival for the entire group was 5 months (range 1-31 months). Conclusion: This technique is simple, well-tolerated and offered significant palliation.