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Strategies to improve dendritic cell cancer immunotherapy outlined.

Vaccine Weekly

| October 06, 2004 | COPYRIGHT 2004 NewsRX. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

2004 OCT 6 - (NewsRx.com & NewsRx.net) -- Researchers outline strategies to improve dendritic cell-based immunotherapy against cancer in a recent issue of the Yonsei Medical Journal.

"Dendritic cells (DCs) play a pivotal role in T cell-mediated immunity and have been shown to induce strong antitumor immune responses in vitro and in vivo. Various approaches utilizing different vaccine cell formats, cell numbers, vaccination schedule, site of vaccination and maturation stages of DCs were investigated worldwide. While clinical trials have demonstrated the safety of such strategies, the clinical outcome was less than expected in most cases," scientists in South Korea report.

"This is due to in part host immunodeficiency imposed by tumors and immuno-editing of tumor cells," said Si Young Song and Han-Soo Kim at Yonsei University. "To overcome these obstacles, new approaches to improve DC-mediated immunotherapeutic strategies are under investigation. First, functional enhancement of monocyte-derived DCs can be generated with using flt3-ligand (FL). Second, diverse antigenic determinants from heat shock-treated tumor cells may improve the immunogenicity of DC-based vaccines. Third, inclusion of ex vivo expanded NK/NKT cells in DC-based vaccines could be beneficial since the bidirectional interaction of these two cell types are known to enhance NK cell ...

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