Fig. 1

Immunohistochemical staining and mutation analysis of MPA and LA patients. Three micrometers FFPE sections of MPA (patient 1) and LA (patient 16) were immunostained with hematoxylin and eosin (× 100 magnification). Scale bar 20 μm. Abbreviations: MPA, micropapillary lung adenocarcinoma; LA, lung adenocarcinoma without micropapillary component