Figure 1.

PDGFR-α expression in invasive breast carcinomas by immunohistochemistry (streptavidin-biotin-peroxidase). (a) Platelet-derived growth factor receptor α (PDGFR-α) expression in pericytes and smooth muscle cells of a blood vessel: internal control (original magnification × 200); (b) Absence of PDGFR-α expression in neoplastic cells (original magnification × 200); (c) PDGFR-α diffuse cytoplasmic expression in neoplastic cells (original magnification × 200; inset × 400); (d) Neoplastic cells showing strong and diffuse cytoplasmic PDGFR-α expression (original magnification × 400).