"A leukemia drug might also effectively treat severe asthma a smallscale clinical trial suggests. Gleevec imatinib reduced the twitchiness of airways making them less likely to reflexively constrict when exposed to an allergen or asthma trigger said senior researcher Dr. Elliot Israel. We showed we could decrease the amount of airway twitchiness by a third Israel said. Thats a substantial change and that was significant compared with the placebo group. Israel is director of the respiratory therapy department at Brigham and Womens Hospital in Boston. The drug also improved overall airway function an effect researchers hadnt expected Israel said. People whose severe asthma isnt controlled despite use of highdose steroid medications are at risk of declining lung function and poor quality of life the researchers said in background notes. But this powerful cancer drug cant be recommended for them on the basis of this small study Israel and other specialists noted. Gleevec fights leukemia by blocking a specific receptor on cancerous white blood cells inhibiting their ability to multiply and spread Israel said. That same action also affects mast cells a type of white blood cell distributed throughout the body that promotes inflammation and causes allergic reactions Israel said. For example mast cells in the skin are responsible for hives while mast cells in the lungs have been associated with severe asthma he said. By blocking the signal that helps keep mast cells alive we were hoping to reduce the number of these cells Israel said. By doing that we hoped to produce improvements beyond the maximal therapy that these patients with severe asthma are on. Israel and his colleagues recruited  severe asthma sufferers for the study. All received topnotch asthma treatment and were randomly assigned to take either Gleevec or a placebo pill once daily during the month trial. Blood tests showed that Gleevec did reduce mast cell activity in patients Israel said. Further allergy challenge tests showed a decrease in airway reactivity among patients taking Gleevec the researchers reported. Airways became less likely to close off after exposure to an allergen. Physical examinations showed that people taking Gleevec actually experienced a slight overall widening of their airways Israel added. There was a small but significant improvement in the airway narrowing in these patients which we didnt expect because we didnt think the mast cells were necessarily promoting that airway narrowing all the time Israel said. Sideeffects were not as severe as expected he added. One person dropped out because of a sharp decline in white blood cells which bounced back after the drug was discontinued. Another person dropped out because of leg cramps associated with the drug. All in all we were expecting a significantly greater pattern of sideeffects and we didnt see it Israel explained. According to Dr. Len Horovitz a pulmonary specialist with Lenox Hill Hospital in New York City This drug represents a new mechanism for the immune modulation of severe asthma. Horovitz was not involved with the study.  It has been a while since a new approach and treatment for severe asthma has emerged Horovitz said. Further studies will be needed to assess its utility in moderate asthma. Pulmonologist Dr. Theodore Maniatis is medical director of Staten Island University Hospital in New York City. He sounded a more cautionary note. This is a very early work that in no way should encourage asthmatics Maniatis said. While it is a very interesting study for pulmonologists and immunologists it is a very small study. Until now this immunemodulating drug has been used only for cancer and is toxic he added. It will take years of study to determine the usefulness of this drug in treatment. Israel agreed that further clinical trials are needed. Before you go out and recommend this be used in general you really want to repeat this in a larger population with greater numbers he said. It likely will be three to four years before Gleevec could be approved for asthma treatment Israel estimated. If proven effective Gleevec might provide a relatively inexpensive new treatment for asthma patients. Two generic versions of the drug were launched last year which could make it less pricey than newwave asthma drugs headed for the market Israel added. The study was published May  in the New England Journal of Medicine. More information For more on asthma visit the U.S. National Heart Lung and Blood Institute https SOURCES Elliot Israel M.D. director respiratory therapy department and director clinical research pulmonary and critical care medicine division Brigham and Womens Hospital Boston Len Horovitz M.D. pulmonary specialist Lenox Hill Hospital New York City Theodore Maniatis M.D. medical director Staten Island University Hospital New York City May   New England Journal of Medicine"