IL9 and non-small cell lung carcinoma: We further investigated IL-9 in epithelial cells isolated from the lung of one NSCLC patient and found decreased numbers of epithelial cells (EpCAM+) producing IL-9 (IL-9+ cells) in the tumoral region as compared to the control region by flow cytometric analysis (Figure 1F). Furthermore, we found few epithelial cells expressing IL-9 distributed in the different regions of the lung of the patients with NSCLC by immunohistochemistry (IHC) (Supplementary Figure 1A).