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Prostatic intraepithelial neoplasia characterized by the presence of morphologically malignant cells lining the acini and ducts. The malignant cells are enlarged, contain prominent nucleoli, and have increased nuclear/cytoloplasmic ratio. The malignant cells may grow within the ducts and acini in four architectural patterns: flat, tufting, micropapillary, and cribriform. The presence of high grade prostatic intraepithelial neoplasia in needle biopsy is a risk factor for the subsequent detection of carcinoma on repeat biopsy. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C5541\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C5541\' NCI Thesaurus)
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