Overview Effect of Omalizumab (Xolair) on Basophils in Patients With Chronic Idiopathic Urticaria Status: Completed Trial end date: 2017-10-01 Target enrollment: Participant gender: Summary This study looks at changes in cell proteins in people with chronic hives treated with omalizumab. Phase: Phase 4 Details Lead Sponsor: University of Colorado, DenverCollaborator: Genentech, Inc.Treatments: Omalizumab