Rifaquat Rahman1, Kelly Hempfling1, Andrew D Norden1, David A Reardon1, Lakshmi Nayak1, Mikael L Rinne1, Rameen Beroukhim1, Lisa Doherty1, Sandra Ruland1, Arun Rai1, Jennifer Rifenburg1, Debra LaFrankie1, Brian M Alexander1, Raymond Y Huang1, Patrick Y Wen1, Eudocia Q Lee1. 1. Harvard Medical School, Boston, Massachusetts (R.R., A.D.N., D.A.R., L.N., M.L.R., R.B., B.M.A., R.Y.H., P.Y.W., E.Q.L.); Center of Neuro-Oncology, Dana-Farber/Brigham and Women's Cancer Center, Boston, Massachusetts (K.H., A.D.N., D.A.R., L.N., M.L.R., R.B., L.D., S.R., J.R., D.L., P.Y.W., E.Q.L.); Department of Neurology, Brigham and Women's Hospital, Boston, Massachusetts (A.D.N., D.A.R., L.N., M.L.R., R.B., P.Y.W., E.Q.L.); Department of Radiation Oncology, Brigham and Women's Hospital, Boston, Massachusetts (B.M.A.); Department of Radiology, Brigham and Women's Hospital, Boston, Massachusetts (R.Y.H.); Boston University School of Medicine, Boston, Massachusetts (A.R.).
Abstract
BACKGROUND: Currently, there are no known effective treatments for recurrent glioblastoma once patients have progressed on a bevacizumab-containing regimen. We examined the efficacy of adding nitrosoureas to bevacizumab in patients who progressed while on an initial bevacizumab-containing regimen. METHODS: In this retrospective study, we identified adult patients with histologically confirmed glioblastoma (WHO grade IV) who were treated with lomustine or carmustine in combination with bevacizumab as a second or third regimen after failing an alternative initial bevacizumab-containing regimen. Response rate (RR), 6-month progression free survival (PFS6), and progression-free survival (PFS) were assessed for each treatment. RESULTS: Forty-two patients were identified (28 males) with a median age of 49 years (range, 24-78 y). Of 42 patients, 28 received lomustine (n = 22) or carmustine (n = 6) with bevacizumab as their second bevacizumab-containing regimen, and 14 received lomustine (n = 11) or carmustine (n = 3) as their third bevacizumab-containing regimen. While the median PFS for the initial bevacizumab-containing regimen was 16.3 weeks, the median PFS for the nitrosourea-containing bevacizumab regimen was 6.3 weeks. Patients had an RR of 44% and a PFS6 rate of 26% during the initial bevacizumab regimen and an RR of 0% and a PFS6 rate of 3% during the nitrosourea-containing bevacizumab regimen. There was increased grade 3-4 toxicity (45% vs 19%, P = .010) during the nitrosourea-containing bevacizumab regimen relative to the initial bevacizumab regimen. Median overall survival was 18.7 weeks from initiation of the nitrosourea-containing bevacizumab regimen. CONCLUSION: The addition of lomustine or carmustine to bevacizumab after a patient has already progressed on a bevacizumab-containing regimen does not appear to provide benefit for most patients and is associated with additional toxicity with the doses used in this cohort.
BACKGROUND: Currently, there are no known effective treatments for recurrent glioblastoma once patients have progressed on a bevacizumab-containing regimen. We examined the efficacy of adding nitrosoureas to bevacizumab in patients who progressed while on an initial bevacizumab-containing regimen. METHODS: In this retrospective study, we identified adult patients with histologically confirmed glioblastoma (WHO grade IV) who were treated with lomustine or carmustine in combination with bevacizumab as a second or third regimen after failing an alternative initial bevacizumab-containing regimen. Response rate (RR), 6-month progression free survival (PFS6), and progression-free survival (PFS) were assessed for each treatment. RESULTS: Forty-two patients were identified (28 males) with a median age of 49 years (range, 24-78 y). Of 42 patients, 28 received lomustine (n = 22) or carmustine (n = 6) with bevacizumab as their second bevacizumab-containing regimen, and 14 received lomustine (n = 11) or carmustine (n = 3) as their third bevacizumab-containing regimen. While the median PFS for the initial bevacizumab-containing regimen was 16.3 weeks, the median PFS for the nitrosourea-containing bevacizumab regimen was 6.3 weeks. Patients had an RR of 44% and a PFS6 rate of 26% during the initial bevacizumab regimen and an RR of 0% and a PFS6 rate of 3% during the nitrosourea-containing bevacizumab regimen. There was increased grade 3-4 toxicity (45% vs 19%, P = .010) during the nitrosourea-containing bevacizumab regimen relative to the initial bevacizumab regimen. Median overall survival was 18.7 weeks from initiation of the nitrosourea-containing bevacizumab regimen. CONCLUSION: The addition of lomustine or carmustine to bevacizumab after a patient has already progressed on a bevacizumab-containing regimen does not appear to provide benefit for most patients and is associated with additional toxicity with the doses used in this cohort.
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