Urinary Volatile Organic Compounds for the Detection of Prostate Cancer

PLoS One. 2015 Nov 24;10(11):e0143283. doi: 10.1371/journal.pone.0143283. eCollection 2015.

Abstract

The aim of this work was to investigate volatile organic compounds (VOCs) emanating from urine samples to determine whether they can be used to classify samples into those from prostate cancer and non-cancer groups. Participants were men referred for a trans-rectal ultrasound-guided prostate biopsy because of an elevated prostate specific antigen (PSA) level or abnormal findings on digital rectal examination. Urine samples were collected from patients with prostate cancer (n = 59) and cancer-free controls (n = 43), on the day of their biopsy, prior to their procedure. VOCs from the headspace of basified urine samples were extracted using solid-phase micro-extraction and analysed by gas chromatography/mass spectrometry. Classifiers were developed using Random Forest (RF) and Linear Discriminant Analysis (LDA) classification techniques. PSA alone had an accuracy of 62-64% in these samples. A model based on 4 VOCs, 2,6-dimethyl-7-octen-2-ol, pentanal, 3-octanone, and 2-octanone, was marginally more accurate 63-65%. When combined, PSA level and these four VOCs had mean accuracies of 74% and 65%, using RF and LDA, respectively. With repeated double cross-validation, the mean accuracies fell to 71% and 65%, using RF and LDA, respectively. Results from VOC profiling of urine headspace are encouraging and suggest that there are other metabolomic avenues worth exploring which could help improve the stratification of men at risk of prostate cancer. This study also adds to our knowledge on the profile of compounds found in basified urine, from controls and cancer patients, which is useful information for future studies comparing the urine from patients with other disease states.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Biomarkers, Tumor*
  • Case-Control Studies
  • Discriminant Analysis
  • Endoscopic Ultrasound-Guided Fine Needle Aspiration
  • Gas Chromatography-Mass Spectrometry
  • Humans
  • Male
  • Middle Aged
  • Models, Statistical
  • Prostate-Specific Antigen / metabolism
  • Prostatic Neoplasms / diagnosis*
  • Prostatic Neoplasms / urine*
  • ROC Curve
  • Reproducibility of Results
  • Volatile Organic Compounds / urine*

Substances

  • Biomarkers, Tumor
  • Volatile Organic Compounds
  • Prostate-Specific Antigen

Grant support

This work was funded by the Rotary club, https://www.rotary.org/en. Additional funding was provided by the Ralph Shackman Trust, Woodfines Llp, Lockton House, Clarendon Road, Cambridge, CB28FH. No official URL is available though registration details of the charity can be found at: http://opencharities.org/charities/287406. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.