title: Six additional systematic lateral cores enhance sextant biopsy prediction of pathological features at radical prostatectomy.
abstract: OBJECTIVE
  We evaluated the contribution of 6 additional systematically obtained, laterally directed biopsy cores to traditional sextant biopsy for the prediction of final pathological findings in the radical prostatectomy specimen.
  
  
  METHODS
  We studied 178 consecutive patients with no history of prostate biopsy in whom prostate cancer was diagnosed during an initial systematic 12 core biopsy and who subsequently underwent radical prostatectomy. Of the systematic 12 cores we compared the subset of the 6 traditional sextant cores (S6C), the set of 6 laterally directed cores (L6C) and the complete 12 core set, which included the 6 traditional sextant and the 6 laterally directed cores. Biopsy Gleason score, number of positive cores, total cancer length and percent of tumor in the biopsy sets were examined for their ability to predict extracapsular extension, total tumor volume and pathological Gleason score.
  
  
  RESULTS
  On univariable analyses the biopsy parameters of the complete 12 core set correlated more strongly with extracapsular extension and total tumor volume than the biopsy parameters of S6C or L6C. On multivariable analyses S6C and L6C were independent predictors of pathological features at prostatectomy.
  
  
  CONCLUSIONS
  The addition of 6 systematically obtained, laterally directed cores to traditional sextant biopsy improved the ability to predict pathological features at prostatectomy by a statistically and prognostically significant margin. Preoperative nomograms that use data from a full complement of 12 systematic cores, specifying sextant and laterally directed biopsy cores, should demonstrate improved performance in predicting prostatectomy pathology.
authors.affiliation: Baylor Prostate Center, Scott Department of Urology, Baylor College of Medicine, Houston, Texas 77030, USA.
authors.forename: Herb
authors.initials: H
authors.lastname: Singh
authors.forename: Eduardo I
authors.initials: EI
authors.lastname: Canto
authors.forename: Shahrokh F
authors.initials: SF
authors.lastname: Shariat
authors.forename: Dov
authors.initials: D
authors.lastname: Kadmon
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Miles
authors.forename: Thomas M
authors.initials: TM
authors.lastname: Wheeler
authors.forename: Kevin M
authors.initials: KM
authors.lastname: Slawin
mesh_terms: D000368:Aged; D001706:Biopsy / Q000379:methods / Q000706:statistics & numerical data; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011467:Prostate / Q000473:pathology*; D011468:Prostatectomy; D011471:Prostatic Neoplasms / Q000473:pathology* / Q000601:surgery*