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Prostate cancer with lower Gleason grade and well-formed glands on hematoxylin and eosin (H&E) slides showing (A) positive ETS related gene (ERG) immunostaining. (B) Tumor with high Gleason grade and ill-defined glands on H&E slide (C) showing negative ERG immunostaining (D). (B, D) Endothelial cells showing positive ERG immunoreactivity.
