CD34 and neoplasm: This study found a significantly higher expression of POSTN in cancer cells and tumor stroma (Figure 1A,B) and a significantly higher expression of pro-angiogenic factors (VEGF-A—Figure 1C; CD31—Figure 1D; CD34—Figure 1E; CD105—Figure 1F) in NSCLC cells compared to NMLT (*** p < 0.001; Mann–Whitney U test) (Figure 1).