Figure 1. Examples of ALK FISH patterns and ALK IHC.
A. ALK FISH fusion and split signal with D. corresponding strong ALK IHC staining (magnification 20x); B. ALK FISH single orange signal and E. corresponding ALK IHC weak staining (magnification 20x). C. ALK FISH split pattern with F. ALK IHC negative staining (magnification 20x).