Fig. 2From: The prognostic role of PD-1, PD-L1, ALK, and ROS1 proteins expression in non-small cell lung carcinoma patients from EgyptDetection of ROS1 gene rearrangement using FISH. a FISH-negative case showing intact two fused signals per nucleus. b FISH-positive cases representing split (red and green) signals. Original magnification × 1000. c Bar plot showing the frequency of the ROS1 gene rearrangementBack to article page