The electromagnetic detection of prostatic cancer: evaluation of diagnostic accuracy

Urology. 2008 Aug;72(2):340-4. doi: 10.1016/j.urology.2007.11.058. Epub 2008 Mar 12.


Objectives: To evaluate the accuracy of the TRIMprob in the diagnosis of prostate neoplasm.

Methods: Consecutive patients referred for prostate biopsy were prospectively enrolled. Patients had history taken, physical examination by digital rectal examination (DRE) of the prostate, assessment of total and free serum prostate-specific antigen (PSA) levels, prostate transrectal ultrasonography (TRUS), and TRIMprob test. Indications for prostate biopsy included one or more of the following conditions: total serum PSA levels of 4.0 ng/mL or more, free/total serum PSA ratio of 0.18 or less, positive results on DRE, and suspicious findings on TRUS. Twelve-core, TRUS-guided biopsies were performed with local anesthesia. A blinded investigator performed the TRIMprob test; the lowest value of the signal at 465 MHz was looked for and recorded, although data of the electromagnetic signal at 930 and 1295 MHz were also recorded.

Results: One hundred eleven patients (aged 64.9 +/- 8.1 years, mean +/- standard deviation), enrolled between November 2004 and August 2005, were analyzed. Total serum PSA level was 8.4 +/- 3.6 ng/mL, and free/total serum PSA ratio was 0.15 +/- 0.7. TRIMprob sensitivity for the diagnosis of prostate cancer was 0.86%; specificity and positive and negative predictive values were 0.60 and 0.88; accuracy was 72%. TRIMprob accuracy outperformed any other diagnostic parameter considered, including the rule of chance. The association of TRIMprob and DRE offered a sensitivity and a negative predictive value of 0.86% or greater.

Conclusions: TRIMprob had the highest accuracy rate, among all other tests, for the diagnosis of prostate cancer. Electromagnetic detection with the TRIMprob test seems to be a promising technology and a useful additional tool for the early detection of prostate cancer.

MeSH terms

  • Aged
  • Biopsy, Needle
  • Digital Rectal Examination
  • Electromagnetic Fields*
  • False Negative Reactions
  • False Positive Reactions
  • Humans
  • Male
  • Middle Aged
  • Prospective Studies
  • Prostate / pathology*
  • Prostate-Specific Antigen
  • Prostatic Neoplasms / pathology*
  • Sensitivity and Specificity


  • Prostate-Specific Antigen