Among them, IL-13 is thought to be important cytokine in the pathogenesis of asthma, and more recently has been shown to play a pivotal role in a number of fibrotic diseases including hepatic and pulmonary fibrosis, and nodular sclerosing Hodgkin’s disease [6,7,8,9,10,11,12]. Here, IL13 is linked to pulmonary fibrosis.