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13 Dec 2011 08:35 AM

Immune Response To Multiple Myeloma Stimulated By Peptide 'Cocktail'

Scientists at Dana-Farber Cancer Institute have created a "cocktail" of immune-stimulating peptides they believe could provoke the body's defenses to attack multiple myeloma in its early "smoldering" phase and slow or prevent the blood cancer.

Based on laboratory results (abstract 3990) presented at the annual meeting of the American Society of Hematology, the researchers say the immunotherapy approach merits testing in human clinical trials.

The combination of four antigenic peptides derived from myeloma cells sparked a stronger diverse response from immune defenses in laboratory culture than any of the individual peptides, according to the team, led by first author Jooeun Bae, PhD, and senior author Nikhil Munshi, MD.

"Thus, targeting multiple myeloma-associated antigens using a cocktail of specific peptides may provide an effective therapeutic application" in patients with the blood cancer and related diseases, the authors wrote.

Multiple myeloma, in which abnormal blood cells accumulate in bones and other organs, causing life-threatening malfunctions, will be diagnosed in about 20,520 Americans in 2011, according to American Cancer Society estimates, and there will be some 10,610 deaths.

Immunotherapy - getting the body's immune system to recognize cancer cells as "foreign" and then unleash a defensive reaction against them - has proven difficult in multiple myeloma. This type of therapy, also referred to as "cancer vaccines," relies on using a peptide - a piece of a protein from the myeloma cell itself - to spark an immune response.

But multiple myeloma, like many cancers, is a shape-shifting foe: Its tumor-associated antigens can appear and disappear, or undergo mutations that change their identity sufficiently to escape immune detection. For this reason, explained Munshi, previous efforts using a single myeloma antigen have failed to elicit effective immune responses against the disease.

In the new study, the Dana-Farber scientists reasoned that challenging the immune system with not just one, but several myeloma antigens...
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