PDCD5 and idiopathic pulmonary fibrosis: Similar to the results obtained from the IF analysis using CCSP, which showed the co-localization of PDCD5 with another club cell marker, the co-expression between PDCD5 and Scgb3a2 was significantly increased in IPF patients, but PDCD5 co-localization did not increase significantly with goblet cell or ciliated cell markers.