MKI67 and small cell lung carcinoma: Of note, we performed hematoxylin/eosin- (Fig. 4B) and Ki-67 stainings (Fig. S4A) of lung tumor sections isolated from transplant recipients, to verify that the transplanted SCLC- and NSCLC-derived cell lines retain their histological properties and proliferation characteristics upon serial passaging in vitro and subsequent transplantation.