IL10 and chronic obstructive pulmonary disease: 2010) and COPD patients (Byers et al. 2013). In addition, several recent studies have shown that elevated IL‐33 also promotes the initiation and progression of lung fibrosis (Luzina et al. 2013; Li et al. 2014). IL‐10 is known as an anti‐inflammatory cytokine involved in the processing of immunosuppressive effects which are necessary for regulating inflammation. Sun et al. (2011) have demonstrated that IL‐10 drives fibrocyte recruitment to the lung and promotes the development of lung fibrosis.