PD71-03 NOVEL DNA METHYLATION MARKERS FOR ACCURATE PROGNOSTIC ASSESSMENT OF PROSTATE CANCER: DISCOVERY AND EARLY VALIDATION

You have accessJournal of UrologyProstate Cancer: Markers III1 Apr 2017PD71-03 NOVEL DNA METHYLATION MARKERS FOR ACCURATE PROGNOSTIC ASSESSMENT OF PROSTATE CANCER: DISCOVERY AND EARLY VALIDATION Matthew T. Gettman, Brian A. Dukek, William R. Taylor, Tracy C. Yab, Xiaoming Cao, Patrick H. Foote, Calise K. Berger, Thomas C. Smyrk, John C. Cheville, Douglas W. Mahoney, R. Jeffrey Karnes, John B. Kisiel, and David A. Ahlquist Matthew T. GettmanMatthew T. Gettman More articles by this author , Brian A. DukekBrian A. Dukek More articles by this author , William R. TaylorWilliam R. Taylor More articles by this author , Tracy C. YabTracy C. Yab More articles by this author , Xiaoming CaoXiaoming Cao More articles by this author , Patrick H. FootePatrick H. Foote More articles by this author , Calise K. BergerCalise K. Berger More articles by this author , Thomas C. SmyrkThomas C. Smyrk More articles by this author , John C. ChevilleJohn C. Cheville More articles by this author , Douglas W. MahoneyDouglas W. Mahoney More articles by this author , R. Jeffrey KarnesR. Jeffrey Karnes More articles by this author , John B. KisielJohn B. Kisiel More articles by this author , and David A. AhlquistDavid A. Ahlquist More articles by this author View All Author Informationhttps://doi.org/10.1016/j.juro.2017.02.3170AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookTwitterLinked InEmail INTRODUCTION AND OBJECTIVES Current prognostic classification of prostate cancer (PCa) is based on Gleason scoring, which is subjective & lacks precision. We sought to identify discriminant methylated DNA markers with potential to enhance prognostic assessment. METHODS For discovery, whole methylome sequencing was applied to DNA extracted from 54 frozen archival tissues [36 PCa cases (18 Gleason 3+3, 18 Gleason ≥7) and 18 normal-appearing prostate controls]. For tissue validation, top candidate markers were assayed by methylation-specific PCR on an independent set of 50 case and 35 control tissues. Tissues were obtained from radical prostatectomies done between 2003-2007; all were reviewed pathologically and micro-dissected prior to DNA extraction and bisulfite treatment. Marker levels were standardized to total human DNA. From the discovery set, marker distributions in cases and controls were assessed to identify discriminant candidates. Markers were correlated with progression (PSA >0.4 ng/ml or confirmed recurrence) using regression partitioning trees (rPart) in PCa cases. From the rPart model, subjects were categorized as low, medium, and high risk progression groups. The prognostic value of methylation markers relative to Gleason scoring was assessed with the likelihood ratio test of competing cox proportional hazards models. RESULTS In the discovery set, 120 candidate markers exceeded filtering criteria (AUC>0.95, fold-change >10, p<0.005). Of these, the top 72 candidate markers were evaluated in the independent set. Numerous markers were identified that highly discriminated PCa from normal-appearing prostate controls, with some achieving AUCs > 0.99. Five prognostic markers (FAM78A, WNT3A, GAS6, LOC100129726, and MAXchr727) were selected by the rPart modeling. The risk grouping defined by methylated DNA markers added significant prognostic content in predicting progression-free survival relative to Gleason scoring (p<0.0001) whereas Gleason scoring had no added value relative to methylated DNA marker risk grouping (p=0.43) (figure) CONCLUSIONS Based on these discovery and early validation data, we identify novel methylated DNA markers with potential to accurately predict progression in PCa. Further exploration is clearly warranted to corroborate and extend these intriguing findings. © 2017FiguresReferencesRelatedDetails Volume 197Issue 4SApril 2017Page: e1356 Advertisement Copyright & Permissions© 2017MetricsAuthor Information Matthew T. Gettman More articles by this author Brian A. Dukek More articles by this author William R. Taylor More articles by this author Tracy C. Yab More articles by this author Xiaoming Cao More articles by this author Patrick H. Foote More articles by this author Calise K. Berger More articles by this author Thomas C. Smyrk More articles by this author John C. Cheville More articles by this author Douglas W. Mahoney More articles by this author R. Jeffrey Karnes More articles by this author John B. Kisiel More articles by this author David A. Ahlquist More articles by this author Expand All Advertisement Advertisement PDF downloadLoading ...