Tumor samples, henceforth named M23, M41 and M43, were chosen for the presence of EGFR only in tumor cells (Fig. 7A, blue arrows) and PDGFRβ only in the stromal component (Fig. 7B), specifically in vascular endothelial cells (green arrows) and/or mesenchymal stromal cells (orange arrows), as assessed by immunohistochemical analyses. Here, PDGFRB is linked to neoplasm.