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Immunotherapy in high-risk pediatric sarcomas shows promising response
Date:7/31/2008

PHILADELPHIA Based on a pilot study in children with sarcoma, researchers at the National Institutes of Health (NIH) believe that immunotherapy could prove beneficial in treating high-risk forms of this cancer.

The researchers tested a novel dendritic vaccine as well as a standard flu vaccine to potentially strengthen the immune system post chemotherapy. Their findings, published in the August 1 issue of Clinical Cancer Research, a journal of the American Association for Cancer Research, show that although the dendritic vaccine they tested did not perform as well as hoped, children participating in the study responded well to the standard flu vaccine suggesting that a strategy to bolster immune function in these patients holds promise for fighting their cancer.

Researchers also found that survival in these patients was at the higher end of what is generally seen with recurrent and/or metastatic Ewing's sarcoma (ESFT) or alveolar rhabdomyosarcoma (AR) the two sarcomas tested in this single arm study. The 22 enrolled patients who did not receive immunotherapy had a 31 percent five-year overall survival, compared to 43 percent five-year survival in 30 patients who ultimately received the novel immunotherapy.

Although the study is small, these early findings are promising, says the study's senior investigator, Crystal Mackall, M.D., of the National Cancer Institute's (NCI) Pediatric Oncology Branch. "We need new therapies. While outcomes overall for these tumors have improved during the past 40 years, there has not been substantial improvement for patients with metastatic or recurrent disease. This study shows that immunotherapy is safe and well tolerated, and could ultimately be beneficial for this high risk population. Mackall calls the study a rational approach to improving treatment of ESFT and AR. "We now know that the immune system of patients recovering from chemotherapy is malleable, so we just need to find the best
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Contact: Jeremy Moore
Jeremy.moore@aacr.org
267-646-0557
American Association for Cancer Research
Source:Eurekalert

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