To investigate the IL-9 expression in the lung of patients with NSCLC, we did immunohistochemistry for IL-9 on post-surgery lung samples collected on tissue arrays and compared IL-9 production from the tumoral region (TU: solid tumor tissue), and the tumor-free control region (CTR: > 5cm away from the solid tumor) in NSCLC (see Materials and Methods and Figure 1A). This evidence concerns the gene IL9 and neoplasm.