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New Therapy Enlists Immune System to Boost Cure Rate in a Childhood Cancer
Date:5/28/2009

--In a First, Immunotherapy Works Against Neuroblastoma--

PHILADELPHIA, May 28 /PRNewswire-USNewswire/ -- A multicenter research team has announced encouraging results for an experimental therapy using elements of the body's immune system to improve cure rates for children with neuroblastoma, a challenging cancer of the nervous system.

John M. Maris, M.D., chief of Oncology at The Children's Hospital of Philadelphia, co-authored the phase 3 clinical trial, which was led by Alice Yu, M.D., Ph.D., of the University of California, San Diego. Maris chairs the committee supervising the trial for the Children's Oncology Group, a cooperative organization that pools resources from leading medical centers to study and devise new treatments for pediatric cancers.

Neuroblastoma, a cancer of the peripheral nervous system, usually appears as a solid tumor in the chest or abdomen. Neuroblastoma accounts for 7 percent of all childhood cancers, but due to its often aggressive nature, causes 15 percent of all childhood cancer deaths.

Yu will present the neuroblastoma study results on June 2 at the annual meeting of the American Society of Clinical Oncology (ASCO) in Orlando, Fla. In advance of the meeting, ASCO published the findings online on May 14.

Maris explained that immunotherapy for cancer involves triggering the body's immune system to attack cancer cells. Monoclonal antibodies are molecules customized to target particular cancers, while cytokines are naturally occurring signaling proteins that regulate the body's immune responses.

In the current study, Children's Oncology Group researchers studied 226 children with high-risk neuroblastoma. Half received the immunotherapy, while half received standard therapy (chemotherapy and stem cell transplantation). The patients who received the immunotherapy were 20 percent more likely than those in the standard therapy group to live disease-free two years after treatment. "This 20 percent improvement in preventing relapse led to a greater cure rate -- the first substantial increase in cure rate for neuroblastoma for more than a decade," said Maris.

The researchers halted the trial earlier than expected after early results showed the benefits of immunotherapy. "This experimental immunotherapy is poised to become part of the new standard of care for children with the aggressive form of neuroblastoma," said Maris.

Maris added that the supply of the antibodies and cytokines used in the trial was limited, and that pediatric oncologists were seeking biotechnology companies to move the biological agents into commercial production to make the treatment readily available to children with neuroblastoma.

The Children's Hospital of Philadelphia has one of the nation's largest clinical and research programs in neuroblastoma. In 2008, Maris led a study that was the first to identify the gene location at which neuroblastoma originates. His laboratory continues to investigate how genes contribute to the disease, using that knowledge to devise new treatments.

Maris served as an oncologist for Alex Scott, the child with neuroblastoma who started a lemonade stand in 2000 to raise money for programs in childhood cancer. Now operated through the Scott family, the Alex's Lemonade Stand Foundation supports ongoing research by members of the Children's Oncology Group.

About The Children's Hospital of Philadelphia: The Children's Hospital of Philadelphia was founded in 1855 as the nation's first pediatric hospital. Through its long-standing commitment to providing exceptional patient care, training new generations of pediatric healthcare professionals and pioneering major research initiatives, Children's Hospital has fostered many discoveries that have benefited children worldwide. Its pediatric research program is among the largest in the country, ranking second in National Institutes of Health funding. In addition, its unique family-centered care and public service programs have brought the 430-bed hospital recognition as a leading advocate for children and adolescents. For more information, visit http://www.chop.edu.

    Contact: Rachel Salis-Silverman
    Phone: (267) 426-6063
    Salis@email.chop.edu


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SOURCE The Children's Hospital of Philadelphia
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