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A Vaccine of Melanoma Peptide Loaded Dendritic<br />

Cells: Preclinical <strong>and</strong> Clinical Data<br />

Albrecht Lindemann, Birgit Herbst, Gabi Kóhler,<br />

Thomas Krause, Andreas Mckensen<br />

Departments of Internal Medicine I (Hematology/Oncology), Pathology <strong>and</strong><br />

Nuclear Medicine, Freiburg University Medical Center, Freiburg, Germany<br />

Dendritic cells (DC) are professional antigen presenting cells (APC) that can be<br />

used for an adoptive transfer to induce a specific T cell response in vivo against<br />

melanoma-associated antigens. We have recently demonstrated that Langerhanstype<br />

cells (LC) as well as mature interdigitating DC can be generated from CD34 +<br />

hematopoietic progenitor cells (HPC) <strong>and</strong> from CD14 +<br />

monocytes by the<br />

sequential use of hematopoietic growth factors including IL-4, GM-CSF, <strong>and</strong> TNF-<br />

(. HPC <strong>and</strong> monocyte-derived DCs were found to exhibit highly similar characteristics.<br />

For clinical use, HPC-derived DC were employed first <strong>and</strong> APC function<br />

was tested by IFN-( production of melan-A-specific CTL after stimulation with<br />

melan-A peptide-loaded DC. In a phase I clinical trial of adoptive immunotherapy,<br />

HLA-A1 or -A2 expressing melanoma patients received a total of four infusions of<br />

5X10 6<br />

-10 7<br />

DC loaded with MAGE-1, MAGE-3 (HLA-A1) or melan-A, gplOO,<br />

tyrosinase (HLA-A2) peptides, respectively. Clinical side effects were mild <strong>and</strong><br />

consisted of low-grade fever (WHO grade I—II) <strong>and</strong> some local inflammatory<br />

responses at the tumor site. To investigate the distribution <strong>and</strong> localization of<br />

infused DC, cells were labeled with 11<br />

'In or "Tc. Results of in vivo tracing <strong>and</strong><br />

immunologic responses will be presented (supported by SFB364).<br />

630

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