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Related Concept Videos

Magnetic Resonance Imaging01:24

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Use of MRI-ultrasound Fusion to Achieve Targeted Prostate Biopsy
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MRI-Targeted Prostate Biopsy Introduces Grade Inflation and Overtreatment.

Abderrahim Oussama Batouche1,2,3, Eugen Czeizler1,3, Timo-Pekka Lehto1,3

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Summary

MRI-targeted biopsies may lead to over-treatment of Gleason Grade Group 2 (GG2) prostate cancer. Patients with GG2 cancer detected by MRI-targeted biopsies have similar recurrence risks to GG1 prostate cancer patients, suggesting updated guidelines are needed.

Keywords:
Magnetic Resonance ImagingNeoplasm GradingRecurrenceSurvivalWatchful Waiting

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Area of Science:

  • Urology
  • Oncology
  • Radiology

Background:

  • MRI-targeted biopsies detect less Gleason Grade Group 1 (GG1) and more GG2 prostate cancer.
  • This shift may be due to improved MRI sensitivity or grade inflation.

Purpose of the Study:

  • To compare definitive treatment likelihood and post-treatment recurrence risk.
  • To evaluate patients with GG2 cancer (targeted biopsy) versus GG1 cancer (systematic biopsy).

Main Methods:

  • Retrospective study using a tertiary center registry (1993-2019).
  • Included 3317 men with GG1 (systematic biopsy) and 554 men with GG2 (targeted biopsy).
  • Assessed curative treatment risk and post-treatment recurrence using Kaplan-Meier curves and Cox regression.

Main Results:

  • Patients with GG1 cancer (systematic biopsy) had a significantly longer median time-to-treatment (31 months) compared to GG2 cancer (targeted biopsy) (4 months).
  • The risk of recurrence after curative treatment was similar between the two groups (HR: 0.94, 95% CI [0.71-1.25]).

Conclusions:

  • GG2 cancers from MRI-targeted biopsies are treated more aggressively than GG1 cancers from systematic biopsies, despite similar oncologic risk.
  • Updated treatment guidelines are necessary to address diagnostic pathway changes and prevent overtreatment.