Broad antigenic coverage induced by vaccination with virus-based cDNA libraries cures established tumors |
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Authors: | Kottke Timothy Errington Fiona Pulido Jose Galivo Feorillo Thompson Jill Wongthida Phonphimon Diaz Rosa Maria Chong Heung Ilett Elizabeth Chester John Pandha Hardev Harrington Kevin Selby Peter Melcher Alan Vile Richard |
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Institution: | Department of Molecular Medicine, Mayo Clinic, Rochester, Minnesota, USA. |
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Abstract: | Effective cancer immunotherapy requires the release of a broad spectrum of tumor antigens in the context of potent immune activation. We show here that a cDNA library of normal tissue, expressed from a highly immunogenic viral platform, cures established tumors of the same histological type from which the cDNA library was derived. Immune escape occurred with suboptimal vaccination, but tumor cells that escaped the immune pressure were readily treated by second-line virus-based immunotherapy. This approach has several major advantages. Use of the cDNA library leads to presentation of a broad repertoire of (undefined) tumor-associated antigens, which reduces emergence of treatment-resistant variants and also permits rational, combined-modality approaches in the clinic. Finally, the viral vectors can be delivered systemically, without the need for tumor targeting, and are amenable to clinical-grade production. Therefore, virus-expressed cDNA libraries represent a novel paradigm for cancer treatment addressing many of the key issues that have undermined the efficacy of immuno- and virotherapy to date. |
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