Recurrent brainstem gliomas treated with oral VP-16

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Abstract
12 patients: (7 males and 5 females) with recurrent brainstem gliomas were treated with the oral topoisomerase inhibitor VP-16 (Etoposide). Patients ranged in age from 3 to 49 years with a median age of 7 years. All patients had been previously treated with radiation therapy (conventional fractionation: 4; hyperfractionation: 8) and 5 had received prior nitrosourea-based chemotherapy at time of tumor recurrence. Tumor recurrence was documented by radiographic tumor enlargement utilizing brain MRI with gadolinium enhancement (12) and clinical neurologic deterioration (9). Two patients underwent biopsy pathologically documenting tumor recurrence. Each cycle of therapy consisted of 21 days of VP-16 (50 mg/m2/day) followed by a 14 day rest followed by an additional 21 days of VP-16 (50mg/m2 day). Complete blood counts were followed bi-weekly and a neurologic examination and brain MRI scan with contrast were performed prior to initiation of each cycle of therapy. Treatment related complications included: partial alopecia (5); diarrhea (5); weight loss (4); neutropenia (2); and thrombocytopenia (4). No patient required transfusion or antibiotic treatment of neutropenic fever. There were no treatment related deaths. 12 patients were evaluable of whom 6 demonstrated a radiographic response (1 complete; 3 partial; 2 stable disease) with a median duration of response of 8 months. In summary; oral VP-16 is a well tolerated and relatively non-toxic chemotherapeutic agent with apparent activity in this small cohort of patients with recurrent brainstem gliomas.