ERBB2 and neoplasm: A similar athymic nude mouse model of lung metastasis (consisting of 3T3-RFP, 3T3/HER2-luc-GFP and mixtures of 3T3-RFP and 3T3/HER2-luc-GFP) was also adopted to confirm the selective action of NIR-PIT on HER2-positive tumour cells (Sato et al., 2015c).