title: The impact of core length on prostate cancer diagnosis during a standard 14-core prostate biopsy scheme.
abstract: BACKGROUND
  Even if many studies in the literature purposed to evaluate the improvement of the prostate biopsy (PBx), few studies assessed the diagnostic value of core length in PBx. In this study, we evaluated the length of needle cores sampled during transrectal PBx (TRUSBx) and its impact on cancer diagnosis in a standard 14-core scheme.
  
  
  METHODS
  Medical records of 573 patients who underwent an initial TRUSBx with 14-cores scheme for suspicious prostate cancer (PCa) at our Department were reviewed. The PBx procedure and pathological evaluation were standardized. Cores lengths were compared in patients with versus without cancer, and were divided into group A and B, respectively. Statistical analysis was done to define an acceptable cut-off for biopsy length.
  
  
  RESULTS
  The mean age of the entire cohort was 62.1 ± 7.2 years, while median total prostate-specific antigen (PSA) and prostate volume were 4.2 ng/ml and 44.7 ml, respectively. PCa was showed in 33.3% of patients. Mean core length in group A versus B was 11.9 ± 3.9 versus 11.1 ± 3.2 mm (p = 0.016). Thus, core lengths were significantly longer in patients with cancer. There were no statistically significant differences when we considered the whole length of cores sampled from the right lobe (p = 0.58) and left lobe (p = 0.34).
  
  
  CONCLUSIONS
  The cancer detection rates in cores may be increased by core length in PCa patients during a TRUSBx. Our results suggest a core length of greater than 11.8 mm as a cut-off for quality warranty.
authors.affiliation: Department of Urology, University Hospital "St. Anna", Cona (Ferrara) - Italy.
authors.forename: Lucio
authors.initials: L
authors.lastname: Dell'Atti
authors.affiliation: Department of Urology, University Hospital "St. Anna", Cona (Ferrara) - Italy.
authors.forename: Carmelo
authors.initials: C
authors.lastname: Ippolito
mesh_terms: D001707:Biopsy, Needle / Q000592:standards; D006801:Humans; D008297:Male; D008875:Middle Aged; D011467:Prostate / Q000473:pathology*; D011471:Prostatic Neoplasms / Q000473:pathology*; D012189:Retrospective Studies