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Some of you who are following this site may remember that I poste...

Posted at 10:36 AM on Apr 10, 2008 by concernedcitizen, #29408
Some of you who are following this site may remember that I posted that when I was following the pathways of the leukeotriene receptor antagonist Singulair that I got to a point where I concluded that there has to be a genetic component (meaning that there are different gene groups of people) and that the efficacy of Singulair (and possibly safety) can vary depending upon what gene group people are in. So I took a little time to see if anybody else was already studying that issue. And YES, they are -- including Merck. quote: " However, logically one might predict that it will be the combination of the polymorphisms in these different key regulatory enzymes and receptors that may ultimately determine treatment response. There have been some attempts to tease out the possible contribution of different genes important in this pathway for treatment response to a Cys leukotriene receptor 1 antagonist.18 However, because of the number of potential gene variants that may contribute to efficacy, large studies will be needed to fully evaluate the potential contribution of pharmacogenetic variability in this pathway to treatment response to Cys leukotriene receptor 1 antagonists. Work in the cardiovascular field has demonstrated the potential importance of genetic variants in this pathway to disease risk and also to treatment response,19 suggesting the potential for important effects to be defined in asthma." (Chest. 2006;130:1873-1878.) © 2006 American College of Chest Physicians Pharmacogenetics of Asthma Ian P. Hall, DM * From the Division of Therapeutics and Molecular Medicine, University Hospital of Nottingham, Nottingham, UK. Correspondence to: Ian P. Hall, DM, Division of Therapeutics and Molecular Medicine, University Hospital of Nottingham, Nottingham NG7 2UH, UK; e-mail: Ian.Hall@nottingham.ac.uk http://www.chestjournal.org/cgi/content/full/130/6/1873 And Merck sponsored a study on this which is now completed. http://clinicaltrials.gov/ct2/show/NCT00116324?intr=%22Montelukast%22&rank=79 Of course, it was sponsored by Merck and paid for by Merck. I don't know if the study discovered anything but I believe this is an indication that Merck acknowledges genetic differences in populations that may predict the success of montelukast. I am not any where close to being an expert in this field. I have another background but I believe that there are experts who can tell you exactly why you had side effects from Singulair.
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Reply about 1 year ago on Apr 10, 2008 by togetherweareloud, #6952

Thanks for your research. I have been wondering about the genetic component to this since my son has neurological problems from birth and reacted to Singulair. I have a friend, her son has cerebral palsy, we both felt that our boys were affected because of their genetic make-up. I wonder what the connection is? Obviously this is not just affecting people with neurological disabilities, yet I wonder if the people who were affected were in some way genetically predisposed to things like depression, etc. With my son, the Singulair did not affect him right away, but rather once he began to have problems from a cyst in his brain. This leads me to believe that there were metabolic or chemical changes taking place as the cyst grew causing him to react to the Singular. He stayed on the Singulair for another year, suffering from many of the side effects listed on this site. He is now off the medication and doing very well. I wonder however what the effect of this will be on the developing mind of children. We need more information about the long term effects if there are any.
Again thanks for all your research.

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Reply about 1 year ago on Apr 10, 2008 by concernedcitizen, #6955

" However, logically one might predict that it will be the combination of the polymorphisms in these different key regulatory enzymes and receptors that may ultimately determine treatment response. There have been some attempts to tease out the possible contribution of different genes important in this pathway for treatment response to a Cys leukotriene receptor 1 antagonist.18 However, because of the number of potential gene variants that may contribute to efficacy, large studies will be needed to fully evaluate the potential contribution of pharmacogenetic variability in this pathway to treatment response to Cys leukotriene receptor 1 antagonists. Work in the cardiovascular field has demonstrated the potential importance of genetic variants in this pathway to disease risk and also to treatment response,19 suggesting the potential for important effects to be defined in asthma."

When I saw that researchers acknowledged the number of potential gene variants that are involved in determining the efficacy of montelukast and then I am reading the reports of the side effects, I am wondering why montelukast was ever approved for seasonal allergies. Asthma is potentially life threatening but why take montelukast for annoying allergies that won't kill you.

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