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IHC analysis of GISTs representing different expression of PTEN and Ki-67 (3,3′-Diaminobenzidine, magnification × 20). (A) PTEN, cytoplasmic staining (H-score, 4) and (B) both cytoplasmic and nuclei staining (H-score, 8). (C) Ki-67 nuclei staining in 5% and (D) 20% of tumor cells.
