Concurrent systemic immunosuppressant therapy (e.g., cyclosporine A, tacrolimus, etc., or chronic administration [> 14 days] of > 20 mg/day of prednisone) within 28 days of the first dose of study drug Concurrent systemic immunosuppressant therapy (e.g., cyclosporine A, tacrolimus, etc., or chronic administration [> 14 days] of > 20 mg/day of prednisone) within 28 days of the first dose of study drug Concurrent systemic immunosuppressant therapy (eg, cyclosporine A, tacrolimus, etc.) within 28 days of the first dose of study drug Regular use of immunosuppressant drugs such as steroids (> 15 mg prednisone equivalents), azathioprine, tacrolimus, cyclosporine, etc; use is not permitted within 4 weeks before recruitment Concurrent systemic immunosuppressant therapy (eg, cyclosporine A, tacrolimus, etc, or chronic administration [> 14 days] of > 20 mg/day of prednisone) within 28 days of the first dose of study drug Concurrent systemic immunosuppressant therapy (eg, cyclosporine A, tacrolimus, etc); any use of corticosteroids EITHER for > 14 days OR at dosages > 20 mg/day of prednisone or equivalent is prohibited Concurrent systemic immunosuppressant therapy (e.g., cyclosporine A, tacrolimus, etc., or chronic administration [> 14 days] of > 10 mg/day of prednisone) within 28 days of the first dose of study drug Patients who are on immunosuppressant medication Concurrent systemic immunosuppressant therapy (e.g., cyclosporine A, tacrolimus, etc., or chronic administration of > 20 mg/day of prednisone) within 28 days of the first dose of study drug Concurrent systemic immunosuppressant therapy (e.g., cyclosporine A, tacrolimus, etc., or chronic administration [> 14 days] of > 60 mg/day of prednisone or equivalent) within 28 days of the first dose of study drug Concurrent systemic immunosuppressant therapy other than corticosteroids (e.g., cyclosporine A, tacrolimus, etc.) within 28 days of the first dose of study drug Chronic treatment with immunosuppressant drugs Participants who received acute, low-dose systemic immunosuppressant medication or a one-time pulse dose of systemic immunosuppressant medication are elgible for study after discussion and approval by the Medical Monitor. Concurrent systemic immunosuppressant therapy other than corticosteroids (e.g., cyclosporine A, tacrolimus, etc.) within 28 days of the first dose of study drug Concurrent systemic immunosuppressant therapy (e.g., cyclosporine, tacrolimus, etc., or chronic administration glucocorticoid equivalent of > 10 mg/day of prednisone) within 28 days of the first dose of study drug Concurrent systemic immunosuppressant therapy (eg, cyclosporine A, tacrolimus, etc., or chronic administration [> 14 days] of > 20mg/day of prednisone) within 14 days of the first dose of study drug Concurrent systemic immunosuppressant therapy (e.g., cyclosporine A, tacrolimus, etc., or chronic administration [> 14 days] of > 10 mg/day of prednisone) within 28 days of the first dose of study drug (prednisone should not be started during screening or be given during the study for treatment of mastocytosis) Concurrent systemic immunosuppressant therapy (e.g., cyclosporine, tacrolimus, etc., or chronic administration glucocorticoid equivalent of > 10 mg/day of prednisone) within 28 days of the first dose of study drug Subjects receiving systemic immunosuppressant therapy (e.g., cyclosporine, tacrolimus, etc.) within 28 days of the first dose of study drug are not eligible Patient must not be on any other systemic immunosuppressant therapy other than corticosteroids within 28 days of the first dose of study drug Concurrent systemic immunosuppressant therapy other than corticosteroids (e.g. cyclosporine A, tacrolimus, etc) within 28 days of the first dose of study drug Concurrent systemic immunosuppressant therapy (e.g., cyclosporine A, tacrolimus, etc., or chronic administration of > 20 mg/day of prednisone) within 28 days of the first dose of study drug Treatment with chronic immunosuppressant (e.g., cyclosporine following transplantation) Concurrent systemic immunosuppressant therapy (eg, cyclosporine A, tacrolimus, etc., or chronic administration [> 14 days] of > 60 mg/day of prednisone) within 28 days of the first dose of study drug Concurrent systemic immunosuppressant therapy (e.g., cyclosporine A, tacrolimus, etc., or chronic administration of > 20 mg/day of prednisone) within 28 days of the first dose of study drug Patient is using systemic immunosuppressant therapy, including cyclosporine A, tacrolimus, sirolimus, and other such medications, or chronic administration of > 5 mg/day or prednisone or the equivalent; participants must be off of immunosuppressant therapy for at least 28 days prior to the first dose of the study drug Concurrent systemic immunosuppressant therapy (e.g., cyclosporine A, tacrolimus, etc.) within 28 days of the first dose of study drug