Abstract: The present invention provides a method of determining the susceptibility of a subject to treatment with a leukotriene modifier by determining the subject's cysteinyl leukotriene (CysLT) level and the subject's level of eosinophilic airway inflammation and identifying a subject with a high ratio of CysLT levels to eosinophilic airway inflammation as susceptible to treatment with the leukotriene modifier. Also discussed is a method of treatment of subjects who are susceptible to treatment that includes administering a leukotriene modifier to such a subject.

Abstract: The present invention provides a method of determining the susceptibility of a subject to treatment with a leukotriene modifier by determining the subject's cysteinyl leukotriene (CysLT) level and the subject's level of eosinophilic airway inflammation and identifying a subject with a high ratio of CysLT levels to eosinophilic airway inflammation as susceptible to treatment with the leukotriene modifier. Also discussed is a method of treatment of subjects who are susceptible to treatment that includes administering a leukotriene modifier to such a subject.

Abstract: The present invention provides a method of determining the susceptibility of a subject to treatment with a leukotriene modifier by determining the subject's cysteinyl leukotriene (CysLT) level and the subject's level of eosinophilic airway inflammation and identifying a subject with a high ratio of CysLT levels to eosinophilic airway inflammation as susceptible to treatment with the leukotriene modifier. Also discussed is a method of treatment of subjects who are susceptible to treatment that includes administering a leukotriene modifier to such a subject.

Abstract: The invention provides methods for predicting the risk for a subject of exacerbation of an inflammatory disease of the airways upon exposure to an environmental agent as well as methods for reducing a subject's risk of exacerbation of an inflammatory disease of the airways upon exposure to an environmental agent.

Abstract: The present invention provides a new analytical method for measuring leukotrienes in a clinical sample using liquid chromatography and tandem mass spectrometry (LCMSMS). The method provides a simple, rapid and low-cost assay for the measurement of leukotriene levels in a clinical sample with high accuracy and precision over the physiological range. The present invention further provides a method to determine the susceptibility of a subject to treatment with a leukotriene modifier, as wells as methods for diagnosis of a chronic obstructive disease of the airways and for predicting the risk of exacerbation of the same.

Abstract: The present invention provides a method of determining the susceptibility of a subject to treatment with a leukotriene modifier by determining the subject's cysteinyl leukotriene (CysLT) level and the subject's level of eosinophilic airway inflammation and identifying a subject with a high ratio of CysLT levels to eosinophilic airway inflammation as susceptible to treatment with the leukotriene modifier. Also discussed is a method of treatment of subjects who are susceptible to treatment that includes administering a leukotriene modifier to such a subject.