Abstract: Methods of detecting and quantifying IL-13 are provided. Also provided are methods of diagnosing, selecting and identifying patients with Th2-associated diseases (Type 2-associated diseases) for treatment with certain therapeutic agents that are Th2 pathway inhibitors (Type 2 pathway inhibitors).

Abstract: The present invention describes novel methods that measure in a mammal the level of at least one biomarker, such as a protein and/or mRNA transcript. Based on the level of at least one biomarker in a mammal exposed to a test compound, compared to the level of the biomarker(s) in a mammal that has not been exposed to a test compound, the ability of the test compound to inhibit tyrosine kinase activity can be determined. The invention also relates to novel methods, wherein a change in the level of at least one biomarker in a mammal exposed to a compound, compared to the level of the biomarker(s) in a mammal that has not been exposed to the compound, indicates whether the mammal is being exposed to, or is experiencing or will experience a therapeutic or toxic effect in response to, a compound that inhibit tyrosine kinase activity.