ERBB3 and rhabdomyosarcoma: In contrast, EGFR (epidermal growth factor receptor), VEGFR2 (VEGF receptor 2 = KDR), and PDGFRA (platelet-derived growth factor receptor α) were overexpressed in embryonal, and ERBB3 (ErbB3) in alveolar and unclassified rhabdomyosarcomas (Fig. 1).