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Phase I clinical trial of a TGF-β antisense-modified tumor cell vaccine in patients with advanced glioma

Abstract

We performed a phase I clinical trial in grade IV astrocytoma to assess the safety of a whole-cell vaccine comprising autologous tumor cells genetically modified by a transforming growth factor-β2 (TGF-β2) antisense vector. Blocking secretion of the immunosuppressive molecule TGF-β in this manner should inhibit one of the major mechanisms by which tumor cells evade immune surveillance and should lead to clinically effective antitumor immunity. Six patients with progressive WHO grade IV astrocytoma were enrolled in the trial. Patients received 2–7 subcutaneous injections of 5 × 106–2 × 107 autologous tumor cells per injection. TGF-β2 secretion by the tumor cells used to vaccinate patients was inhibited by 53–98%. Treatment was well tolerated with only low-grade, transient treatment-related toxicities reported. Two patients had partial regressions and two had stable disease following therapy. The overall median survival was 68 weeks. Median survival of the responding patients was 78 weeks, compared to a historic value of 47 weeks for glioma patients treated conventionally. There were indications of humoral and cellular immunity induced by the vaccine. These findings support further clinical evaluation of vaccines comprised of TGF-β antisense-modified tumor cells.

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Acknowledgements

We thank Helen Lin, MD and Ali Haghighi for their helpful contributions to this project. This work was partially supported by grants no. CA96025 and CA105964 from the National Institutes of Health, Bethesda, MD to NovaRx Corporation, San Diego, CA.

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Correspondence to D L Shawler.

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Fakhrai, H., Mantil, J., Liu, L. et al. Phase I clinical trial of a TGF-β antisense-modified tumor cell vaccine in patients with advanced glioma. Cancer Gene Ther 13, 1052–1060 (2006). https://doi.org/10.1038/sj.cgt.7700975

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