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Gene abnormality found to predict childhood leukemia relapse
Date:1/7/2009

Scientists have identified mutations in a gene that predict a high likelihood of relapse in children with acute lymphoblastic leukemia (ALL). Although the researchers caution that further research is needed to determine how changes in the gene, called IKZF1 or IKAROS, lead to leukemia relapse, the findings are likely to provide the basis for future diagnostic tests to assess the risk of treatment failure. By using a molecular test to identify this genetic marker in ALL patients, physicians should be better able to assign patients to appropriate therapies.

The findings of the Children's Oncology Group (COG) study, led by scientists from St. Jude Children's Research Hospital, Memphis, Tenn., the University of New Mexico Cancer Research and Treatment Center, Albuquerque, N.M., and the National Cancer Institute (NCI), part of the National Institutes of Health, appear online Jan.7, 2009, in the New England Journal of Medicine, and in print on Jan. 29, 2009.

ALL, a cancer of the white blood cells, is the most common childhood cancer, in that it affects about one in 29,000 children annually. Using currently available therapies, cure rates for ALL are now upwards of 80 percent. However, those therapies carry with them substantial side effects, and even with treatment, only 30 percent of children who experience a relapse of ALL will survive five years. Determining the risk of relapse faced by an individual patient would help physicians tailor treatment intensity appropriately, but until now there has been no good marker for predicting outcome.

"Great progress has been made in recent years in improving the cure rate of childhood ALL," said Stephen Hunger, M.D., chairman of the COG ALL committee and the lead COG investigator on this study. "The findings of this study help us further subdivide those patients who are unlikely to be cured, and identify patients in whom different therapies should be tested."

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Contact: NCI Office of Media Relations
ncipressofficers@mail.nih.gov
301-496-6641
NIH/National Cancer Institute
Source:Eurekalert

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