MKI67 and neoplasm: Despite the similar size of tumours from Calu1 cells was observed, immunohistochemical (IHC) staining for Ki‐67 revealed a decrease in the mitotic index in m126+i221 Calu1 tumours compared with SCR Calu1 tumours and an increase in the necrotic area, as evaluated by IHC staining (Fig. S8B).