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Keywords:

  • prostate cancer;
  • erectile function;
  • IIEF score;
  • prostate needle biopsy

What's known on the subject? and What does the study add?

  • There have been several studies that have suggested there may be a relationship between prostate biopsy and erectile function and LUTS. Previous studies have suggested a specific association between the type of local anaesthesia administered and/or the number of biopsies performed. Other studies have suggested an exacerbation of LUTS after prostate biopsy.
  • The present study identifies a positive cancer diagnosis as a novel characteristic that may explain a relationship between biopsy and worsening erectile function.

Objective

  • To evaluate prospectively the characteristics, erectile function and lower urinary tract symptoms (LUTS) of men undergoing prostate needle biopsy (PNBx).

Patients and Methods

  • From 2008 to 2011, 134 men were prospectively administered the International Index of Erectile Function (IIEF), American Urological Association Symptom Index (AUA-SI), and quality-of-life (QoL) questionnaires before and after undergoing a single 12-core PNBx.
  • Comparisons of IIEF and AUA-SI scores before and after PNBx, based upon baseline characteristics and prostate cancer (PCa) diagnosis, were performed.
  • Univariable and multivariable logistic regression models were used to characterize predictors of change in IIEF scores.

Results

  • In the 85 men who fulfilled the inclusion criteria, there were no significant differences between the mean (sd) total pre-biopsy and the mean (sd) post-biopsy IIEF scores: 57.8 (12.9) vs 54.3 (17.2).
  • Subgroup analysis showed that men who had biopsy-proven PCa had significantly greater changes in their post-biopsy IIEF scores compared with men without (−10.1 vs. 1.0; P < 0.001).
  • After specific analyses of the IIEF domains in these groups we found significant decreases in every domain, including erectile function (P = 0.01). On multivariate analyses, only PCa diagnosis was associated with a significant change in IIEF (odds ratio 7.2; P = 0.003).
  • There were no differences in AUA-SI or QoL scores in the overall population or in subgroups.

Conclusions

  • Cancer diagnosis appears to have an adverse effect on the erectile function of men undergoing PNBx but no effect on LUTS. This study highlights a potential negative psychological confounder that may influence erectile function before the treatment of PCa.
  • Additional prospective trials evaluating these relationships are warranted.