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Blood, 19 February 2009, Vol. 113, No. 8, pp. 1651-1660. Prepublished online as a Blood First Edition Paper on December 12, 2008; DOI 10.1182/blood-2008-07-168666.
GENE THERAPY Peripheral blood lymphocytes genetically modified to express the self/tumor antigen MAGE-A3 induce antitumor immune responses in cancer patients1 Cancer Gene Therapy Unit, Cancer Immunotherapy and Gene Therapy Program, Department of Oncology, 2 Strategic Program of Oncology, 3 Bone Marrow Transplantation Unit, 4 Department of Surgery, and 5 Department of Pathology, Scientific Institute San Raffaele, Milan, Italy; 6 de Duve Institute, Université Catholique de Louvain, Brussels, Belgium; 7 Ludwig Institute for Cancer Research, Brussels, Belgium; 8 Università Vita-Salute San Raffaele, Milan, Italy; and 9 MolMed SpA, Milan, Italy
Dendritic cell (DC) targeting in vivo has recently been shown to confer strong and protective cytotoxic T lymphocyte (CTL)–based immunity in tumor murine models. Our group has recently demonstrated in preclinical models that the infusion of genetically modified lymphocytes (GMLs) expressing the self/tumor antigen TRP-2 is able to elicit functional TRP-2–specific effectors with antitumor activity by targeting DCs in vivo. Here we have analyzed vaccine- and tumor-specific immune responses of 10 melanoma patients treated with autologous GMLs expressing the cancer germline gene MAGE-A3. Three of 10 patients treated with MAGE-A3–GML showed an increase of circulating anti–MAGE-A3 T cells, and developed skin delayed-type hypersensitivity to MAGE-A3. Interestingly, in 2 of these patients, with progressive and measurable tumors at study entry, anti–MAGE-A3 T cells were detected not only in the blood but also within tumors resected after vaccination. These results demonstrate that the infusion of MAGE-A3–GML elicits antitumor T cells, which are capable of trafficking to inflamed tissues and of infiltrating tumors. Clinical studies on a larger group of patients are needed to evaluate the clinical efficacy of such a strategy.
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