The present invention features, inter alia, methods of treating patients having a mast cell-mediated inflammatory disease, methods of determining whether patients having a mast cell-mediated inflammatory disease are likely to respond to a therapy (e.g., a therapy comprising an agent selected from the group consisting of a tryptase antagonist, an Fc epsilon receptor (FcεR) antagonist, an lgE+ B cell depleting antibody, a mast ceil or basophil depleting antibody, a protease activated receptor 2 (PAR2) antagonist, an IgE antagonist, and a combination thereof), methods of selecting a therapy for a patient having a mast cell-mediated inflammatory disease, methods for assessing a response of a patient having mast cell-mediated inflammatory disease, and methods for monitoring the response of a patient having a mast cell-mediated inflammatory disease.
