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Published in: Cancer Immunology, Immunotherapy 3/2006

01-03-2006 | Original Article

Induction of cellular immune responses against carcinoembryonic antigen in patients with metastatic tumors after vaccination with altered peptide ligand-loaded dendritic cells

Authors: Jana Babatz, Christoph Röllig, Bärbel Löbel, Gunnar Folprecht, Michael Haack, Heinrich Günther, Claus-Henning Köhne, Gerhard Ehninger, Marc Schmitz, Martin Bornhäuser

Published in: Cancer Immunology, Immunotherapy | Issue 3/2006

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Abstract

Purpose: Dendritic cells (DCs) are characterized by their extraordinary capacity to induce T-cell responses, providing the opportunity of DC-based cancer vaccination protocols. In the present study, we conducted a phase I/II clinical trial to determine the capability of DCs differentiated from immunomagnetically isolated CD14+ monocytes and pulsed with a carcinoembyonic antigen-derived altered peptide (CEAalt) to induce specific CD8+ T cells in cancer patients. Experimental design: Nine patients with CEA-positive colorectal cancer (n=7) or lung cancer (n=2) were enrolled in this study. Autologous CD14+ monocytes were isolated by large-scale immunomagnetic separation and differentiated to mature DCs in sufficient numbers and at high purity. After incubation with the CEAalt peptide and keyhole limpet hemocyanin, DCs were administered to patients intravenously at dose levels of 1×107 and 5×107 cells. Patients received four immunizations every second week. Results: ELISPOT analysis revealed a vaccine-induced increase in the number of CEAalt peptide-specific Interferon (IFN)-gamma producing CD8+ T cells in five of nine patients and of CD8+ T lymphocytes recognizing the native CEA peptide in three of nine patients. In addition, CD8+ T lymphocytes derived from one patient exhibiting an immunological response after vaccination efficiently lysed peptide-loaded T2 cells and tumor cells. Immunization was well tolerated by all patients without severe signs of toxicity. Conclusion: Vaccination with CEAalt-pulsed DCs derived from immunomagnetically isolated CD14+ monocytes efficiently expand peptide-specific CD8+ T lymphocytes in vivo and may be a promising alternative for cancer immunotherapy.
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Metadata
Title
Induction of cellular immune responses against carcinoembryonic antigen in patients with metastatic tumors after vaccination with altered peptide ligand-loaded dendritic cells
Authors
Jana Babatz
Christoph Röllig
Bärbel Löbel
Gunnar Folprecht
Michael Haack
Heinrich Günther
Claus-Henning Köhne
Gerhard Ehninger
Marc Schmitz
Martin Bornhäuser
Publication date
01-03-2006
Publisher
Springer-Verlag
Published in
Cancer Immunology, Immunotherapy / Issue 3/2006
Print ISSN: 0340-7004
Electronic ISSN: 1432-0851
DOI
https://doi.org/10.1007/s00262-005-0021-x

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