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Children's National researchers develop novel anti-tumor vaccine
Date:10/2/2008

WASHINGTON, DCA novel anti-tumor vaccine for neuroblastoma and melanoma developed by scientists and clinicians at Children's National Medical Center in collaboration with investigators from the University of Iowa is showing significant impact on tumor growth in mice, according to new research published in the October edition of the research journal Cancer Immunology, Immunotherapy. The vaccine uses the tumor's own protein to induce an immune system response, allowing for a personalized approach to treatment.

The vaccine and delivery system, developed in the laboratory of Children's National Chief of General and Thoracic Surgery Anthony Sandler, MD, involves the creation of synthetic microparticles known as "immune stimulatory antigen loaded particles" (ISAPs), that consist of tumor antigens (proteins) from the specific tumor to be targeted, as well as immune stimulatory agents. The ISAPs are detected and engulfed by specialized immune cells and sensed to be immune-stimulating "foreign bodies."

The study shows that ISAPs are effective at blocking the growth of tumors in mice by inducing activation of immune cells that then stimulate the immune system to specifically target the tumor whose antigens match those that are loaded in the particles known as tumor specific immunity.

The research team also discovered, however, that the impact of ISAPs on tumor growth was partially mitigated by an increased presence of regulatory t-cells (T-reg) when ISAPs are introduced into the body. The researchers believ
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Contact: Jennifer Leischer
jleische@cnmc.org
202-476-4500
Children's National Medical Center
Source:Eurekalert

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