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Representative staining results in the primary prostatic extra-gastrointestinal stromal tumor. (A) Hematoxylin and eosin staining showed that the tumor cells predominantly consisted of spindle cells growing in fascicles. Immunohistochemistry staining revealed positive staining for (B) prostate-specific antigen, (C) androgen receptor, (D) DOG1, (E) CD34, (F) CD117; negative staining for (G) cytokeratin, (H) SMA, (J) S-100 and (J) Desmin, and (K) Ki-67 (at 5%).
