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Experimental Melanoma Immunotherapy Model Using Tumor Vaccination with a Hematopoietic Cytokine
Published on: February 24, 2023
Cytolytic T-cell responses of cancer patients vaccinated with a MAGE antigen
Pierre G Coulie1, Vaios Karanikas, Christophe Lurquin
1Cellular Genetics Unit, Institute of Cellular Pathology, Université de Louvain, Brussels, Belgium.
Abstract:
'Cancer-germline' genes such as the MAGE gene family are expressed in many tumors and in male germline cells but not in normal tissues. They encode shared tumor-specific antigens, which have been used in therapeutic vaccination trials of metastatic melanoma patients. To establish whether there is a correlation between tumoral regressions and T-cell responses against the vaccine antigen, we evaluated the responses of patients vaccinated with a MAGE-3 antigenic peptide or a recombinant virus coding for the peptide. Blood lymphocytes were stimulated with antigenic peptide followed by detection with tetramer, T-cell cloning, and TCR analysis. In 4/9 regressor patients and in 1/14 progressors we found a low level, usually monoclonal cytolytic T lymphocyte response against the MAGE-3 peptide.
Insights
Therapeutic cancer vaccines targeting MAGE antigens showed a correlation between tumor regression and T-cell responses. A low-level T-cell response against the MAGE-3 peptide was observed in some patients who experienced tumor regression.
Area of Science:
- Immunology
- Oncology
- Vaccinology
Background:
- Cancer-germline genes, like the MAGE family, are expressed in tumors and male germ cells but not normal tissues.
- These genes encode tumor-specific antigens used in therapeutic vaccination trials for metastatic melanoma.
- Evaluating the link between tumor regression and T-cell responses to vaccine antigens is crucial.
Observation:
- This study evaluated the T-cell responses in patients vaccinated with a MAGE-3 antigenic peptide or a recombinant virus encoding the peptide.
- Blood lymphocytes were stimulated and analyzed for T-cell responses using tetramer, T-cell cloning, and TCR analysis.
Findings:
- A low-level, typically monoclonal, cytolytic T lymphocyte response against the MAGE-3 peptide was detected in 4 out of 9 patients with tumor regression.
- Only 1 out of 14 patients with progressive disease exhibited a similar T-cell response.
Implications:
- These findings suggest a correlation between tumoral regressions and T-cell responses against MAGE-3 peptide vaccination in metastatic melanoma.
- This could inform future cancer vaccine development and patient selection strategies.
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