Correlations of periostin (POSTN) expression levels in stromal cells (CAFs) with podoplanin (D2-40) in (A) non-small cell lung carcinoma (NSCLC) (r = 0.27, *** p < 0.001), (B) squamous cell cancer (SCC) (r = 0.25, *** p < 0.001), and (C) adenocarcinoma (AC), (r = 0.20, *** p < 0.001).