IL4 and asthma: Peripheral blood T lymphocytes of asthmatic patients who were treated with Chuankezhi injection (CKZ) secreted more interferon-gamma (IFN-γ) and less interleukin-4 (IL-4).[12,13,14] With the publication of a number of trials on CKZ for asthma, they have certificated that CKZ has a good clinical effect.