Integration of autologous dendritic cell-based immunotherapy in the standard of care treatment for patients with newly diagnosed glioblastoma: results of the HGG-2006 phase I/II trial |
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Authors: | Hilko Ardon Stefaan W. Van Gool Tina Verschuere Wim Maes Steffen Fieuws Raf Sciot Guido Wilms Philippe Demaerel Jan Goffin Frank Van Calenbergh Johan Menten Paul Clement Maria Debiec-Rychter Steven De Vleeschouwer |
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Affiliation: | 1. Department of Neurosurgery, Catholic University of Leuven, Leuven, Belgium 2. Department of Experimental Medicine, Catholic University of Leuven, Leuven, Belgium 8. Department of Child and Women, Catholic University of Leuven, Leuven, Belgium 3. Department of Biostatistics and Statistical Bioinformatics, Catholic University of Leuven, Leuven, Belgium 4. Department of Pathology, Catholic University of Leuven, Leuven, Belgium 5. Department of Imaging, Catholic University of Leuven, Leuven, Belgium 6. Department of Radiotherapy, Catholic University of Leuven, Leuven, Belgium 7. Department of Oncology, Catholic University of Leuven, Leuven, Belgium 9. Department of Human Genetics, Catholic University of Leuven, Leuven, Belgium 10. Department of Neurosurgery, University Hospital Leuven, Herestraat 49, 3000, Leuven, Belgium
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Abstract: | Purpose Dendritic cell (DC)-based tumor vaccination has rendered promising results in relapsed high-grade glioma patients. In the HGG-2006 trial (EudraCT 2006-002881-20), feasibility, toxicity, and clinical efficacy of the full integration of DC-based tumor vaccination into standard postoperative radiochemotherapy are studied in 77 patients with newly diagnosed glioblastoma. Patients and methods Autologous DC are generated after leukapheresis, which is performed before the start of radiochemotherapy. Four weekly induction vaccines are administered after the 6-week course of concomitant radiochemotherapy. During maintenance chemotherapy, 4 boost vaccines are given. Feasibility and progression-free survival (PFS) at 6?months (6mo-PFS) are the primary end points. Overall survival (OS) and immune profiling, rather than monitoring, as assessed in patients’ blood samples, are the secondary end points. Analysis has been done on intent-to-treat basis. Results The treatment was feasible without major toxicity. The 6mo-PFS was 70.1?% from inclusion. Median OS was 18.3?months. Outcome improved significantly with lower EORTC RPA classification. Median OS was 39.7, 18.3, and 10.7?months for RPA classes III, IV, and V, respectively. Patients with a methylated MGMT promoter had significantly better PFS (p?=?0.0027) and OS (p?=?0.0082) as compared to patients with an unmethylated status. Exploratory “immunological profiles” were built to compare to clinical outcome, but no statistical significant evidence was found for these profiles to predict clinical outcome. Conclusion Full integration of autologous DC-based tumor vaccination into standard postoperative radiochemotherapy for newly diagnosed glioblastoma seems safe and possibly beneficial. These results were used to power the currently running phase IIb randomized clinical trial. |
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