POSTN and neoplasm: The correlation analysis showed a significant positive correlation (Spearman’s correlation test) between POSTN expression in tumor cells and its expression in the tumor stroma (r = 0.68; p < 0.001; Figure 5A) in the entire group of patients with NSCLC, as well as in individual subtypes: AC (r = 0.77, p < 0.001; Figure 5B), SCC (r = 0.67, p < 0.001; Figure 5C), and LCC (r = 0.44, p = 0.007; Figure 5D).