CAV1 and pulmonary fibrosis: In this study, comparing the P and H groups, there were no significant differences in the airsacculitis score and fibrosis score, as well as the protein expression level of Cav-1 between the two groups, indicating the similar effects of pirfenidone and prednisone on airsacculitis and pulmonary fibrosis as well as the Cav-1 expression.