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Abstract #5542

Unseen Clinically Significant Prostate Cancer on 3T Multiparametric MRI Challenging Screening and Focal Therapy: An In-bore MRI-Guided Biopsy Study of MRI Negative Areas

Kareem K Elfatairy1, Christopher P Filson2, Omer G Kucuk3, Peter J Rossi4, Viraj A Master2, and Sherif G Nour1

1Radiology, Emory University-School of Medicine, Atlanta, GA, United States, 2Urology, Emory University-School of Medicine, Atlanta, GA, United States, 3Hematology-Oncology and Urology, Emory University-School of Medicine, Atlanta, GA, United States, 4Radiation Oncology, Emory University-School of Medicine, Atlanta, GA, United States

The use of multiparametric MRI for prostate cancer screening is challenged by the potential missing of clinically significant cancer in areas with no visible abnormalities. We randomly biopsied areas with no visible targets under direct MRI guidance. Out of 43 biopsied areas, negative predictive value for clinically significant cancers was 90.7% suggesting a very low potential for harboring clinically significant cancers and supporting the use of mpMRI in cancer screening and active surveillance. An extended biopsy approach including sampling of areas without visible MRI abnormalities may still need to be considered prior to focal therapy.

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