title: Prostate cancer transrectal HIFU ablation: detection of local recurrences using T2-weighted and dynamic contrast-enhanced MRI.
abstract: The objective was to evaluate T2-weighted (T2w) and dynamic contrast-enhanced (DCE) MRI in detecting local cancer recurrences after prostate high-intensity focused ultrasound (HIFU) ablation. Fifty-nine patients with biochemical recurrence after prostate HIFU ablation underwent T2-weighted and DCE MRI before transrectal biopsy. For each patient, biopsies were performed by two operators: operator 1 (blinded to MR results) performed random and colour Doppler-guided biopsies ("routine biopsies"); operator 2 obtained up to three cores per suspicious lesion on MRI ("targeted biopsies"). Seventy-seven suspicious lesions were detected on DCE images (n = 52), T2w images (n = 2) or both (n = 23). Forty patients and 41 MR lesions were positive at biopsy. Of the 36 remaining MR lesions, 20 contained viable benign glands. Targeted biopsy detected more cancers than routine biopsy (36 versus 27 patients, p = 0.0523). The mean percentages of positive cores per patient and of tumour invasion of the cores were significantly higher for targeted biopsies (p < 0.0001). The odds ratios of the probability of finding viable cancer and viable prostate tissue (benign or malignant) at targeted versus routine biopsy were respectively 3.35 (95% CI 3.05-3.64) and 1.38 (95% CI 1.13-1.63). MRI combining T2-weighted and DCE images is a promising method for guiding post-HIFU biopsy towards areas containing recurrent cancer and viable prostate tissue.
authors.affiliation: Department of Urinary and Vascular Radiology, Hospices Civils de Lyon, Hôpital Edouard Herriot, Lyon 69437, France. olivier.rouviere@netcourrier.com
authors.forename: Olivier
authors.initials: O
authors.lastname: Rouvière
authors.forename: Nicolas
authors.initials: N
authors.lastname: Girouin
authors.forename: Ludivine
authors.initials: L
authors.lastname: Glas
authors.forename: Alexandre
authors.initials: A
authors.lastname: Ben Cheikh
authors.forename: Albert
authors.initials: A
authors.lastname: Gelet
authors.forename: Florence
authors.initials: F
authors.lastname: Mège-Lechevallier
authors.forename: Muriel
authors.initials: M
authors.lastname: Rabilloud
authors.forename: Jean-Yves
authors.initials: JY
authors.lastname: Chapelon
authors.forename: Denis
authors.initials: D
authors.lastname: Lyonnet
mesh_terms: D000368:Aged; D003287:Contrast Media; D057086:High-Intensity Focused Ultrasound Ablation / Q000379:methods*; D006801:Humans; D008297:Male; D008536:Meglumine; D009364:Neoplasm Recurrence, Local / Q000175:diagnosis* / Q000517:prevention & control*; D009942:Organometallic Compounds; D011379:Prognosis; D011471:Prostatic Neoplasms / Q000175:diagnosis* / Q000628:therapy*; D012007:Rectum; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D016896:Treatment Outcome
chemical_list: D003287:Contrast Media; D009942:Organometallic Compounds; D008536:Meglumine; C072417:gadoterate meglumine
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