Likert score 3 prostate lesions: Association between whole-lesion ADC metrics and pathologic findings at MRI/ultrasound fusion targeted biopsy

Andrew B. Rosenkrantz, Xiaosong Meng, Justin M. Ream, James S. Babb, Fang Ming Deng, Henry Rusinek, William C. Huang, Herbert Lepor, Samir S. Taneja

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Background To assess associations between whole-lesion apparent diffusion coefficient (ADC) metrics and pathologic findings of Likert score 3 prostate lesions at MRI/ultrasound fusion targeted biopsy. Methods This retrospective Institutional Review Board-approved study received a waiver of consent. We identified patients receiving a highest lesion score of 3 on 3 Tesla multiparametric MRI reviewed by a single experienced radiologist using a 5-point Likert scale and who underwent fusion biopsy. A total of 188 score 3 lesions in 158 patients were included. Three-dimensional volumes-of-interest encompassing each lesion were traced on ADC maps. Logistic regression was used to predict biopsy results based on whole-lesion ADC metrics and patient biopsy history. Biopsy yield was compared between metrics. Results By lesion, targeted biopsy identified tumor in 22.3% and Gleason score (GS) > 6 tumor in 8.5%, although results varied by biopsy history: biopsy-naïve (n = 80), 20.0%/8.8%; prior negative biopsy (n = 53), 9.4%/1.9%; prior positive biopsy (n = 55): 40.0%/14.5%. Biopsy history, whole-lesion mean ADC, whole-lesion ADC10-25, and whole-lesion ADC25-50 were each significantly associated with tumor or GS > 6 tumor at fusion biopsy (P ≤ 0.047). In men without prior negative prostate biopsy, whole-lesion ADC25-50 ≤ 1.04∗10-3 mm2/s achieved 90.0% sensitivity and 50.0% specificity for GS > 6 tumor, which was significantly higher (P < 0.001) than specificity of PSA (17.5%) at identical sensitivity. Conclusion For score 3 lesions in patients without prior negative biopsy, whole-lesion ADC metrics help detect GS > 6 cancer while avoiding negative biopsies. However, deferral of fusion biopsy may be considered for score 3 lesions in patients with prior negative biopsy (without applying whole-lesion ADC metrics) given exceedingly low (∼ 2%) frequency of GS > 6 tumor in this group. J. Magn. Reson. Imaging 2016;43:325-332.

    Original languageEnglish (US)
    Pages (from-to)325-332
    Number of pages8
    JournalJournal of Magnetic Resonance Imaging
    Volume43
    Issue number2
    DOIs
    StatePublished - Feb 1 2016

    Keywords

    • MRI
    • apparent diffusion coefficient
    • diffusion-weighted imaging
    • prostate biopsy
    • prostate cancer

    ASJC Scopus subject areas

    • Radiology Nuclear Medicine and imaging

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