Associations between NSCLC grading and (A) PDPN, (B) SYK and (C) FGF2 mRNA expression level, defined as log2(FC). NSCLC, non-small cell lung cancer; PDPN, podoplanin; SYK, spleen protein kinase; FGF2, fibroblast growth factor 2; FC, fold-change, difference in mRNA level between tumor and normal lung tissues.