Abstract
Following our pilot clinical study of combined IL-2/HSV-TK gene therapy for recurrent glioblastoma multiforme (GBM), we extended the protocol to a larger population of patients and evaluated safety, feasibility, and biological activity of treatment. A total of 12 patients received intratumor injection of retroviral vector-producing cells (RVPCs), followed by intravenous ganciclovir (GCV). Treatment was well tolerated with only minor adverse events. Transduction of tumor cells was demonstrated in tumor biopsies. A marked and persistent increase of intratumor and plasma Th1 cytokine levels was demonstrated after RVPC injection. At magnetic resonance imaging evaluation, two patients had a partial response (including a patient showing disappearance of a distant noninjected tumor mass), four had a minor response, four had stable disease, and two had progressive disease. The 6- and 12-month progression-free survival rates were 47 and 14%, respectively. The 6- and 12-month overall survival rates were 58 and 25%, respectively. In conclusion, the results of our clinical protocol of gene therapy for recurrent GBM, based on combined delivery of a suicide and a cytokine gene, demonstrate that intratumor injection of RVPCs was safe, provided effective transduction of the therapeutic genes to target tumor cells, and activated a systemic cytokine cascade, with tumor responses in 50% of cases.
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Acknowledgements
This work was supported by grants from MIUR no. 2002062741 and FIRB no. RBNE0127YS-006.
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Colombo, F., Barzon, L., Franchin, E. et al. Combined HSV-TK/IL-2 gene therapy in patients with recurrent glioblastoma multiforme: biological and clinical results. Cancer Gene Ther 12, 835–848 (2005). https://doi.org/10.1038/sj.cgt.7700851
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DOI: https://doi.org/10.1038/sj.cgt.7700851
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