CONCURRENT CARBOPLATIN AND I-125 BRACHYTHERAPY FOR RECURRENT GLIOBLASTOMA-MULTIFORME

Toxicity and safety study of concurrent carboplatin chemotherapy and i odine-125 (I-125) brachytherapy. I-125 brachy therapy has an establish ed albeit limited role in surgically accessible recurrent gliomas. Car boplatin has anti-tumoral; activity against gliomas and demonstrated s ensitization of tumor to radiotherapy. In 15 patients (age range 30-77 years; median 53) with recurrent glioblastoma multiforme, stereotacti cally placed catheters were afterloaded with I-125 sources. A median 5 0 Gy minimum treatment volume dose was delivered during a 100 h period in conjunction with continuous infusion carboplatin (100 mg/m(2)/20 h x 5). Tumor volumes ranged from 13 to 63 cm(3) (median, 32 cm(3)). Ea rly complications included: headache (n=7), transient exacerbations of pre existing neurologic deficits (n=5), seizures (n=2), nausea/vomiti ng (n=2), myelosuppression (n=2) and a catheter site wound CSF leak (n =1). Late complications included: steroid dependency (n=10), carcinoma tous meningitis in association with hydrocephalus (n=1) and radiation- induced necrosis requiring reoperation (n=6). All patients were evalua ble with a median survival of 10 months. In 12 patients, best clinical and neuroradiographic response was stable disease all of whom died of recurrent tumor (local recurrence in 11; CSF dissemination in 1). In 3 patients best response was either complete (n=2) or partial (n=1) al l of whom are alive with a median follow-up of 31 months. I-125 brachy therapy with concurrent carboplatin chemotherapy is associated with an acceptable level of toxicity, has anti-tumoral activity and warrants further investigation in carefully selected patients with recurrent gl iomas.