Indian Journal of Urology Users online:637  
IJU
Home Current Issue Ahead of print Editorial Board Archives Symposia Guidelines Subscriptions Login 
Print this page  Email this page Small font sizeDefault font sizeIncrease font size


 
  Table of Contents 
UROSCAN
Year : 2011  |  Volume : 27  |  Issue : 3  |  Page : 430-431
 

Olfactory detection of prostate cancer by dogs sniffing urine: A step forward in early diagnosis


Department of Urology, CSM Medical University (Upgraded King George's Medical College), Lucknow, Uttar Pradesh, India

Date of Web Publication26-Sep-2011

Correspondence Address:
Apul Goel
Department of Urology, CSM Medical University (Upgraded King George's Medical College), Lucknow, Uttar Pradesh
India
Login to access the Email id

Source of Support: None, Conflict of Interest: None


Rights and PermissionsRights and Permissions

 

How to cite this article:
Kumar M, Mandal S, Goel A. Olfactory detection of prostate cancer by dogs sniffing urine: A step forward in early diagnosis. Indian J Urol 2011;27:430-1

How to cite this URL:
Kumar M, Mandal S, Goel A. Olfactory detection of prostate cancer by dogs sniffing urine: A step forward in early diagnosis. Indian J Urol [serial online] 2011 [cited 2019 Aug 24];27:430-1. Available from: http://www.indianjurol.com/text.asp?2011/27/3/430/85461

Cornu JN, Cancel-Tassin G, Ondet V, Girardet C, Cussenot O. Olfactory Detection of Prostate Cancer by Dogs Sniffing Urine: A Step Forward in Early Diagnosis. EurUrol 2011;59:197-201.



   Summary Top


Serum Prostate Specific Antigen is the most widely used biomarker for detection of cancer prostate (PCa).Volatile organic compounds (VOCs) in the urine have been proposed as alternative biomarkers. [1] The authors through this study tried to determine if some VOCs in urine could result in specific odor associated with PCa that could be detected by a specially trained dog. They conducted a double-blind study to check the ability of the dog to detect PCa by sniffing urine.

A dog was trained by a professional and dedicated team to discriminate between urine from individual with PCa from that of control. The dog was taught to sit in front of sample of urine recognized as cancer. The study included a "training phase" where the dog was conditioned to detect VOCs and a "testing phase" where the dog's ability to detect cancer was checked. In case of success (dog sitting in front of PCa urine sample), the result was classified as a true positive and the controls as true negatives, and the next cancer sample was tested. In case of mistake (dog sitting in front of control urine sample), the control sample was classified as false positive and the cancer sample as a false negative. Thirty-three runs were conducted during the double-blind testing phase. In 30 cases, the dog sat in front of the cancer sample. In three runs, the dog sat in front of a control sample. In these three cases, the control samples incorrectly classified were considered false positives, and the three cancer cases were considered false negatives. During the testing phase, the dog correctly classified 60 samples out of 66. The three patients who provided the urine samples that were classified as false positive underwent a new biopsy, and one was diagnosed with PCa. The sensitivity and specificity of the dog for detecting VOCs in the urine was 91% for both.


   Comments Top


Specific VOCs are present in the urine of patients with PCa. Previous work suggests that dogs can be trained to smell urine and recognize lung, bladder and breast cancer with various success rates. [2] The scientific basis of this ability of dogs to detect the odor signature of cancer is believed to be linked to the VOCs produced by malignant cells. [3] Basic research studies have established that during tumor growth, protein changes in malignant cells lead to per-oxidation of the cell membrane components and produce VOCs that can be detected in urine. [4] This study shows for the first time that, regularly trained by a dedicated team, a dog can distinguish a PCa urine sample among controls with powerful results. These preliminary data reflect the existence of a potential odor signature of PCa that may correspond to one or multiple VOCs. These molecules remain unknown for the moment and should be assessed by specific gas chromatography/mass spectrometry analysis. To date, metabolomics studies have only individualized sarcosine as a potential biomarker for PCa. [5] This study opens the door of VOC detection for PCa diagnosis. Metabolomic studies should complete this approach by determining the volatile molecular signature of PCa.

 
   References Top

1.JemalA,SiegelR,WardE,HaoY,XuJ,ThunMJ.Cancerstatistics,2009.ACancerJClin2009;59: 225-49.  Back to cited text no. 1
    
2.Willis CM, Church SM, Guest CM, Cook WA, McCarthy N, Bransbury AJ, et al. Olfactory detection of human bladder cancer by dogs: Proof of principle study. BMJ 2004;329:712-4.  Back to cited text no. 2
[PUBMED]  [FULLTEXT]  
3.Kneepkens CM, Lepage G, Roy CC. The potential of the hydrocarbon breath test as a measure of lipid peroxidation. Free Rad Biol Med 1994;17:127-60.  Back to cited text no. 3
[PUBMED]    
4.Bajaj A, Miranda OR, Kim IB, Phillips RL, Jerry DJ, Bunz UH, et al. Detection and differentiation of normal, cancerous, and metastatic cells using nanoparticle- polymer sensor arrays. ProcNatlAcadSci U S A 2009;106:10912-6.  Back to cited text no. 4
    
5.Sreekumar A, Poisson LM, Rajendiran TM, Khan AP, Cao Q, Yu J, et al. Metabolomic profiles delineate potential role for sarcosine in prostate cancer progression. Nature 2009;457:910-4.  Back to cited text no. 5
[PUBMED]  [FULLTEXT]  




 

Top
Print this article  Email this article
 

    

 
   Search
 
  
    Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
    Article in PDF (174 KB)
    Citation Manager
    Access Statistics
    Reader Comments
    Email Alert *
    Add to My List *
* Registration required (free)  


   Summary
   Comments
    References

 Article Access Statistics
    Viewed1752    
    Printed70    
    Emailed0    
    PDF Downloaded51    
    Comments [Add]    

Recommend this journal

HEALTHWARE INDIA