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Combined BRAF-targeted and immunotherapy shows promise for melanoma treatment
Date:6/15/2010

PHILADELPHIA Combined targeted therapy against the BRAF/MAPK pathway with immunotherapy shows promise as a new therapeutic approach for the treatment of melanoma, according to results of a preclinical study published in Cancer Research, a journal of the American Association for Cancer Research.

"Our results provide preclinical evidence for the rational combination of BRAF-targeted therapy and immunotherapy in the treatment of this most dangerous type of skin cancer," said lead researcher Jennifer A. Wargo, M.D., division of surgical oncology at Massachusetts General Hospital, Boston.

"By blocking the oncogenic BRAF, tumor antigen expression may be restored. This would make the melanoma tumors susceptible to strategies incorporating immunotherapy," she said.

Previous studies have shown that melanoma treatment with selective BRAF inhibitors are very effective and result in a high initial response rate, but the response is temporary. An alternative approach would be to combine other agents and extend the duration of treatment response.

Using biopsies of melanoma tumors, the researchers investigated the effects of mitogen-activated protein kinase (MAPK) pathway inhibition vs. selective inhibition of BRAF-V600E on T-cell function.

Inhibition of the MAPK pathway with a specific inhibitor of BRAF-V600E resulted in increased expression of antigens, which was associated with improved recognition by antigen-specific T-cell. T-cell function was not compromised after treatment with BRAF-V600E.

Mario Colombo, Ph.D., director of molecular immunology at the Italian National Cancer Institute and senior editor for Cancer Research, said these results advance cancer research by offering new arguments to sustain the combination of selective targeted therapy with immunotherapy.

"This study shows the need for considering the effect of off-targeted drug therapy on the many aspects of host immune respo
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Contact: Tara Yates
tara.yates@aacr.org
267-646-0558
American Association for Cancer Research
Source:Eurekalert  

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