Fig. 3From: Successful salvage surgery followed by second ALK–TKI after alectinib failure in a patient with ALK-positive NSCLCMicroscopic findings of the tumor indicated pleomorphic carcinoma with adenocarcinoma features. a Hematoxylin and eosin staining (× 200). b TTF-1 immunostaining. c Vimentin immunostaining. d ALK immunostaining. TTF-1 thyroid transcription factor-1, ALK anaplastic lymphoma kinaseBack to article page