A phase II trial with bevacizumab and irinotecan for patients with primary brain tumors and progression after standard therapy

Søren Møller, Kirsten Grunnet, Steinbjørn Hansen, Henrik Schultz, Mats Holmberg, Morten Sorensen, Hans S Poulsen, Ulrik Lassen
Acta Oncologica 2012, 51 (6): 797-804

UNLABELLED: The combination of irinotecan and bevacizumab has shown efficacy in the treatment of recurrent glioblastoma multiforme (GBM). A prospective, phase II study of 85 patients with various recurrent brain tumors was carried out. Primary endpoints were progression free survival (PFS) and response rate.

MATERIAL AND METHODS: Patients with recurrent primary brain tumors with performance status 0-2 were eligible. Intravenous bevacizumab 10 mg/kg and irinotecan 125/340 mg/m(2) were administered every 14 days. Evaluation was carried out every eight weeks using MRI and Macdonald response criteria. Treatment was continued until progression.

RESULTS: In total 85 patients were included with the following histologies: GBM (n = 32), glioma WHO gr. III (n = 33), glioma WHO gr. II (n = 12) and others (n = 8). Patients received a median of four cycles. ORR (overall response rate) for glioblastoma was 25% and 59% achieved stable disease (SD). Median PFS was 5.2 months. For grade III gliomas ORR was 21% and 45% had SD. Median PFS was 3.7 months. No objective responses occurred in grade II gliomas. In the non-glioma population, one PR as well as several long PFS times were observed.

DISCUSSION AND CONCLUSION: The combination of bevacizumab and irinotecan is well tolerated and moderately efficacious in glioblastoma and glioma WHO gr. III. A majority of patients achieve at least disease stabilization. Prolonged progression-free survival in non-glioma patients warrants further research.

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