Diffusion-weighted magnetic resonance imaging detects significant prostate cancer with high probability

Area of Science:

• Radiology
• Oncology
• Medical Imaging

Background:

• Prostate cancer diagnosis relies on accurate staging.
• Diffusion-weighted magnetic resonance imaging (DW-MRI) shows promise for noninvasive cancer detection.

Purpose of the Study:

• To assess the diagnostic accuracy of 3 Tesla DW-MRI for detecting significant prostate cancer.
• To evaluate DW-MRI's sensitivity and specificity without contrast or endorectal coils.

Main Methods:

• Prospective study of 111 men undergoing pelvic DW-MRI before prostatectomy.
• Three independent readers assessed cancer suspicion qualitatively.
• Final pathology served as the reference standard for significant cancer (index lesion ≥1 cm, extraprostatic extension, or Gleason score ≥7).

Main Results:

• DW-MRI demonstrated high sensitivity (89-91%) and specificity (77-81%) for significant prostate cancer across three readers.
• Good interreader agreement (Fleiss κ 0.65-0.74) was observed.
• Median reading time was 13-18 minutes.

Conclusions:

• 3 Tesla DW-MRI is a noninvasive, accurate tool for detecting significant prostate cancer.
• The technique offers good interreader agreement and short reading times, without needing contrast or endorectal coils.
• DW-MRI warrants further evaluation for patient stratification and personalized treatment planning.