Document Detail

The role of serum testosterone to prostate-specific antigen ratio as a predictor of prostate cancer risk.
MedLine Citation:
PMID:  23217356     Owner:  NLM     Status:  In-Data-Review    
We analyzed the ratio of serum total testosterone (sTT) to prostate-specific antigen (PSA) as a predictor of prostate cancer risk. One-hundred-four consecutive men with a normal digital rectal examination and a serum PSA level of 2.5-10 ng/ml underwent transrectal ultrasonography-guided biopsy using a 10-core scheme. The sTT level was determined before the procedure using a chemiluminescent assay, and the ratio of sTT to PSA (sTT/PSA) was calculated after transforming sTT measurements from ng/dL to ng/mL. The overall cancer detection rate was 17.3%. The median sTT level was 332 ng/dl in men with cancer and 413 ng/dL in those without (p = 0.032). The median sTT/PSA ratio in these groups was 0.55 and 0.74, respectively (p = 0.035). The receiver operator characteristic (ROC) method was used to evaluate the properties of the sTT/PSA ratio, with testosterone and PSA as predictors of prostate cancer risk. The accuracy of the sTT/PSA ratio in prostate cancer diagnosis, represented by the area under the curve (AUC), was 0.739 (95% CI 0.640-0.823, p < 0.05). Optimizing the sensitivity and specificity of the sTT/PSA ratio using the ROC provided a cutoff point of 0.60, which corresponded to 82% sensitivity and 62% specificity. When the patients were divided into normal- and low-sTT level groups according to testosterone value (300 ng/dl), the probability of detecting prostate cancer was 3.3-fold higher in hypogonadal men as compared with eugonadal men. These results support the use of the sTT-to-PSA ratio for predicting the risk of prostate cancer and increasing the specificity of PSA measurement.
Cenk Gurbuz; Lutfi Canat; Gokhan Atis; Bayram Guner; Turhan Caskurlu
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Publication Detail:
Type:  Journal Article     Date:  2012-03-31
Journal Detail:
Title:  The Kaohsiung journal of medical sciences     Volume:  28     ISSN:  1607-551X     ISO Abbreviation:  Kaohsiung J. Med. Sci.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100960562     Medline TA:  Kaohsiung J Med Sci     Country:  China (Republic : 1949- )    
Other Details:
Languages:  eng     Pagination:  649-53     Citation Subset:  IM    
Copyright Information:
Copyright © 2012. Published by Elsevier B.V.
Department of 2nd Urology, Istanbul Goztepe Training and Research Hospital, Istanbul, Turkey. Electronic address:
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