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Researchers discover mutations linked to relapse of childhood leukemia
Date:2/3/2013

After an intensive three-year hunt through the genome, medical researchers have pinpointed mutations that leads to drug resistance and relapse in the most common type of childhood cancerthe first time anyone has linked the disease's reemergence to specific genetic anomalies.

The discovery, co-lead by William L. Carroll, MD, director of NYU Langone Medical Center's Cancer Institute, is reported in a study published online February 3, 2013, in Nature Genetics.

"There has been no progress in curing children who relapse, in spite of giving them very high doses of chemotherapy and bone marrow transplants," said Dr. Carroll.

The discovery suggests how scientists may be able to thwart a dangerous form of acute lymphoblastic leukemia, a rapidly progressing blood-borne cancer that strikes about 6,000 people in the United States every year and accounts for more than one in four pediatric cancers. Eventually, such information could help doctors detect the early emergence of chemotherapy-resistant leukemia cells in patients and switch to a different treatment strategy before the disease can fully reassert itself.

In acute lymphoblastic leukemia, abbreviated ALL, the body's bone marrow produces an abnormally large number of lymphocytes, or white blood cells. Improved treatments have increased the overall cure rate to roughly 80 percent. But Dr. Carroll says the prognosis is especially dire for some 20 percent of patients who relapse.

Medical researchers have suspected that the reemergence of disease could be due to drug resistance, but previous efforts had not uncovered any definitive pathway. For the new study, led by Dr. Carroll and graduate student Julia Meyer, researchers at five U.S. institutions spent three years analyzing multiple bone marrow samples from pediatric ALL patients for more clues to the disease's progression.

With the help of the Children's Oncology Group, a multi-institutional clinical trial
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Contact: Christopher Rucas
Christopher.Rucas@nyumc.org
212-404-3525
NYU Langone Medical Center / New York University School of Medicine
Source:Eurekalert

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