Abstract
Purpose
To investigate the performance of pre-surgery CT and multiparametric MRI (mpMRI) to identify lymph node (LN) metastases in the Michigan Urological Surgery Improvement Collaborative (MUSIC). Abdominopelvic CT and mpMRI are commonly used for intermediate- and high-risk prostate cancer (PCa) staging.
Methods
Retrospective analysis of the MUSIC registry identified patients undergoing robot-assisted radical prostatectomy (RP) between 3/2012 and 7/2018. Patients were classified according to pre-surgery imaging modality. Primary outcomes were operating characteristics of CT and mpMRI for detection of pathologic LN involvement (pN1).
Results
A total of 10,250 patients underwent RP and 3924 patients (38.3%) underwent CT and/or mpMRI prior to surgery. Suspicion for LN involvement was identified on 2.3% CT and 1.9% mpMRI. Overall, 391 patients were pN1(3.8%), including 0.1% low-, 2.1% intermediate-, and 10.9% high-risk PCa patients. Of 235 pN1 patients that underwent CT prior, far more had negative (91.1%) than positive (8.9%) findings, yielding sensitivity: 8.9%, specificity: 98.3%, negative predictive value (NPV): 92.1%, and positive predictive value (PPV): 32.3% for CT with regard to LN metastases. Similarly, more patients with pN1 disease had negative mpMRI (81.0%) then suspicious or indeterminate MRI (19.0%), yielding sensitivity: 19.0%, specificity: 97.3%, NPV: 95.9%, and PPV: 26.7%.
Conclusions
Abdominopelvic CT and mpMRI have clear limitations in identifying LN metastases. Additional clinicopathologic features should be considered when making management decisions, as 2.1% and 10.9% with intermediate-and high-risk cancer had metastatic LNs. The majority of pN1 patients had a negative CT or a negative/indeterminate mpMRI prior to RP. Pelvic LN dissection should be performed in RP patients with intermediate- or high-risk PCa, independent of preoperative imaging results.
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Acknowledgements
We would like to acknowledge the significant contribution of the clinical champions, urologists, and data abstractors in each participating practice. In addition, we would like to acknowledge the support provided by the Value Partnerships program at Blue Cross Blue Shield of Michigan. We would also like to acknowledge the support provided by the Betz Family Endowment for Cancer Research (RG0813-1036). Funding was provided in part by the Spectrum Health Foundation. We also acknowledge Crystal Farrell and Stephen Babitz for critical review of the manuscript and Sabrina Noyes for administrative support.
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HP: data collection, manuscript writing. BR Lane: project development, data management, data analysis, manuscript writing/editing. JQ: data analysis. TK: data management, manuscript editing. JEM: project development, manuscript editing. AM: data management, manuscript editing. CMB: project development, data management, manuscript editing. JM: project development; manuscript editing. Michigan Urological Surgery Improvement Collaborative: project development, data collection and management.
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Each MUSIC practice obtained an exemption or approval for collaborative participation from a local Institutional Review Board.
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Peabody, H., Lane, B.R., Qi, J. et al. Limitations of abdominopelvic CT and multiparametric MR imaging for detection of lymph node metastases prior to radical prostatectomy. World J Urol 39, 779–785 (2021). https://doi.org/10.1007/s00345-020-03227-7
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DOI: https://doi.org/10.1007/s00345-020-03227-7