Mutant genes in high-risk childhood leukemias identified

    Memphis, Tennessee, May 19, 2009



    A research team has pinpointed a new class of gene mutations, which identify cases of childhood acute lymphoblastic leukemia (ALL) that have a high risk of relapse and death. The finding suggests specific drugs that could treat this high-risk leukemia subtype in children, particularly because such drugs are already in clinical trials for similar blood diseases in adults.

    While the cure rate in pediatric ALL has reached about 85 percent, the remaining high-risk cases have proven especially intractable because they arise from different, unidentified genetic mutations.

    Discovery of the mutations was led by scientists from St. Jude Children’s Research Hospital, the Children’s Oncology Group (COG), 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 (NIH). This research was done as part of the NCI Therapeutically Applicable Research to Generate Effective Treatments (TARGET) initiative, which seeks to utilize the study of genomics to identify therapeutic targets in order to develop more effective treatments for childhood cancers. The article appears online May 18 in the early edition of the Proceedings of the National Academy of Sciences.

    “We have made such great progress in curing children with ALL that the main challenge is now the remaining high-risk patients,” said St. Jude Scientific Director, James Downing, M.D., a co-senior author of the study. “We still do not know how to accurately identify these patients and effectively treat them to provide the highest chance for a cure. The problem is that this high-risk group is likely a heterogeneous mixture of biologic subtypes.”

    The new study builds on the researchers’ previous genetic analysis of the leukemic cells from pediatric ALL patients.

    “The findings from our previous studies have hinted that some high-risk ALL cases might arise from mutations in genes that produce enzymes called kinases, which function as biological on-off switches in cells,” said Charles Mullighan, M.D., Ph.D., assistant member in the St. Jude Department of Pathology and a co-first author of the study. “Such mutations would cause those kinases to be stuck in the on position, triggering the uncontrolled proliferation of white blood cells that is seen in leukemia.”

    Thus, the researchers began to analyze the genetic sequences of many kinases known to be components of the proliferation machinery of white blood cells. The team analyzed the leukemic cells from 187 patients with high-risk ALL. That analysis revealed mutations in about 10 percent of the cases in a family of protein kinases called JAK, whose members were also known to be mutated in other types of leukemias and related diseases.

    “Further studies of these mutant JAK proteins revealed that the changes in their molecular structures could switch them on to drive the blood cell proliferation that is characteristic of ALL,” said Stephen Hunger, M.D., chairman of the COG ALL committee and a co-senior author of the study. “What’s more, in test tube studies, we found that drugs blocking the activation of the mutant JAK kinases prevented uncontrolled growth suggesting that drugs that target JAK proteins might be effective in this subtype of ALL.”

    The researchers discovered, in some high-risk ALL patients, that mutations in JAK appeared to work in concert with another mutation—in the gene IKZF1—which they had earlier found to underlie such cases.

    “Our studies of these leukemia subtypes indicate that leukemia is not necessarily a single-cause disease,” said Cheryl Willman, M.D., director and CEO of the University of New Mexico Cancer Research and Treatment Center and a co-senior author of the study. “A patient may have multiple different genetic lesions that target different cellular pathways to induce leukemia. Thus, it is very important to develop new therapies that target these specific mutations, and our discovery of JAK as target now allows us to begin to develop clinical trials with JAK inhibitors for children and adults with this form of disease.”

    In further studies, the researchers plan to identify mutations in kinase genes and other enzymes that underlie high-risk ALL, as well as explore how these abnormalities might work together to drive the cancers.

    The discovery that mutations in JAK underlie some cases of high-risk ALL is enough to warrant clinical trials of inhibitory drugs to treat such cancers.

    “JAK-inhibiting drugs are now moving into clinical trials for treatment of such adult myeloproliferative diseases as polycthemia vera, essential thrombocytosis and primary myelofibrosis,” Downing said. “We expect that there will soon be initial clinical studies to assess the safety and effectiveness of these drugs in children with relapsed ALL in which JAK mutations have been identified within their leukemic cells.”

    Such studies would be coordinated by the COG, an international clinical trial cooperative group supported by the NCI.

    Other authors of the paper are Racquel Collins-Underwood, Letha A. Phillips, Xiaoping Su, Wei Liu and Brenda Schulman (St. Jude); Sarah Tasian and Mignon Loh (University of California San Francisco); Meenakshi Devidas (Children’s Oncology Group); Susan Atlas, I-Ming Chen and Richard C. Harvey (University of New Mexico Cancer Research and Treatment Center, Albuquerque); Robert J. Clifford, Daniela Gerhard, Malcolm Smith and Jinghui Zhang (National Cancer Institute); William Carroll (New York University Cancer Institute); and Gregory H. Reaman (The George Washington University).

    This research was supported in part by a supplement to the Children’s Oncology Group Chair’s award; a National Cancer Institute Strategic Partnering to Evaluate Cancer Signatures Program award; the National Institutes of Health/National Institute of General Medical Sciences Pharmacogenetics Research Network and Database; National Institutes of Health Cancer Center Core Grants; the Children’s Oncology Group and Statistical Center; the Leukemia and Lymphoma Society Specialized Center of Research grant supporting University of New Mexico Cancer Center; CureSearch; St. Baldrick’s Foundation; a National Health and Medical Research Council (Australia) CJ Martin Traveling Fellowship; and ALSAC.

    St. Jude Children’s Research Hospital
    St. Jude Children’s Research Hospital is internationally recognized for its pioneering work in finding cures and saving children with cancer and other catastrophic diseases. Founded by late entertainer Danny Thomas and based in Memphis, Tenn., St. Jude freely shares its discoveries with scientific and medical communities around the world. No family ever pays for treatments not covered by insurance, and families without insurance are never asked to pay. St. Jude is financially supported by ALSAC, its fundraising organization.

    The Children’s Oncology Group/CureSearch
    Children’s Oncology Group (COG), the world’s largest cooperative pediatric cancer research organization, which includes every recognized pediatric cancer program in North America, comprises a network of more than 5,000 physician, nurse, and other clinical and laboratory investigators whose collaboration in clinical and translational research has turned childhood cancer from a virtually incurable disease to one with an overall cure rate approaching 80 percent. COG is committed to conquering childhood cancer through scientific discovery and compassionate care. For more information, please visit www.childrensoncologygroup.org.

    The University of New Mexico Cancer Research and Treatment Center
    The UNM Cancer Center is New Mexico’s only National Cancer Institute-designated cancer center, and is home to the state’s largest and most experienced team of cancer experts with 85 board-certified oncology physicians and more than 120 research scientists, supported by more than $50 million in grants annually. The UNM Cancer Center has major programs in research in hematologic malignancies, focusing specifically on leukemia. As the Official Cancer Center of the State of New Mexico, the Center served 7,600 new patients last year in over 90,000 patient visits, treating nearly half of all adults with cancer in the state and virtually all the children.

    The National Cancer Institute
    NCI leads the National Cancer Program and the NIH effort to dramatically reduce the burden of cancer and improve the lives of cancer patients and their families, through research into prevention and cancer biology, the development of new interventions, and the training and mentoring of new researchers. For more information about cancer, please visit the NCI Web site at http://www.cancer.gov  or call NCI's Cancer Information Service at 1-800-4-CANCER (1-800-422-6237).