Fig. 1

a Western Blot analysis comparison of YKL-40 gene expressions in normal lung tissues and non-small cell lung cancer (NSCLC). b YKL-40 immunohistochemistry staining comparison between normal lung tissue and lung tumor tissue (200 x magnification). c YKL-40 expression comparison analysis between normal lung cell and lung adenocarcinoma (Luad) & Lung squamous carcinoma (Lusc), *, P < 0.05, **, P < 0.005 (d) The correlation between YKL40 expression and NSCLC patient prognosis. Comparison of YKL40 expression and patient prognosis was examined using the Prognoscan database