EGFR and neoplasm: Figure 9 shows immunohistochemical staining of PDX tumor tissues with positive staining for EGFR (4NSG-SLNBT = 14.2 ± 5.5, 4NSG-SLNWT = 5 ± 2.2), HER2 4NSG-SLNBT = 2.3 ± 1.2 4NSG-SLNWT = 3.6 ± 1.9) and VEGFR (4NSG-SLNBT = 6.6 ± 1.8, 4NSG-SLNWT = 7.7 ± 1.4).