In the present study, we demonstrated that IL-33 and TSLP, two important cytokines of the innate immune response, were elevated in the BAL fluids of the patients with IPF relative to those of the normal controls, as well as the patients with other interstitial lung diseases, including HP, NSIP, and sarcoidosis. The gene discussed is IL33; the disease is idiopathic pulmonary fibrosis.