Figure 1. Positive IHC reactions in NSCLC. a) Adenocarcinoma - the tumor cells stain strongly for cytokeratin CK7, 400x; b) Squamous cell carcinoma - the tumor cells are positive for p40 and c) positive for cytokeratin CK5/6, 400x. The tissue samples were obtained from archived paraffin blocks collected in the Department of Oncological Pathology University Clinical Hospital in Poznań (photos and IHC reactions A. Grodzka, K. Kowalska, M. Krzyżaniak).
