TNF and pulmonary fibrosis: The high numbers of eosinophils in pulmonary fibrosis lungs are thought to be associated with the expression of TNF‐α and possibly also with the release of eosinophil chemotactic activity by lung fibroblasts and bronchial epithelial cells (Sato, Koyama, & Robbins, 2000; Zhang, Gharaee‐Kermani, McGarry, Remick, & Phan, 1997).