251. Impact of Detecting Occult Pathologic Nodal Disease During Resection for Malignant Pleural Mesothelioma.
- Author
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Verma V, Wegner RE, Stahl JM, Barsky AR, Raghavan D, Busquets TE, Hoppe BS, Grover S, Friedberg JS, and Simone CB 2nd
- Subjects
- Aged, Female, Follow-Up Studies, Humans, Lymphatic Metastasis, Male, Mesothelioma, Malignant surgery, Middle Aged, Pleural Neoplasms surgery, Prognosis, Retrospective Studies, Survival Rate, Lymph Node Excision mortality, Mesothelioma, Malignant pathology, Pleural Neoplasms pathology
- Abstract
Background: Lymph node (LN) involvement is a poor prognostic factor for malignant pleural mesothelioma (MPM). However, to our knowledge, postresection outcomes of node-negative (cN0/pN0), occult pathologic nodal disease (cN0/pN+), and clinical node-positive disease (cN+) have not been compared to date., Patients and Methods: The National Cancer Data Base was queried for newly diagnosed, resected MPM with known clinical/pathologic LN information. Three cohorts were compared: cN0/pN0, cN+, and cN0/pN+. Multivariable logistic regression examined predictors of pathologic nodal upstaging. Kaplan-Meier analysis with propensity matching assessed overall survival (OS); multivariate Cox proportional hazards modeling examined predictors thereof., Results: Of 1369 patients, 687 (50%) had cN0/pN0, 457 (33%) cN+, and 225 (16%) cN0/pN+ disease. Median follow-up was 29 months. In patients with cN0 disease, factors associated with pathologic nodal upstaging were younger age, greater number of examined LNs, and nonsarcomatoid histology (P < .05 for all). Relative to pN0 cases, occult LN involvement (65% being pN2) was associated with 51% higher hazard of mortality on multivariate analysis (P = .005). Following propensity matching, the OS of cN0/pN+ was similar to cN+ cases (P = .281). On multivariate analysis, the number of involved LNs (continuous variable, P = .013), but not nodal tumor, node, metastasis (TNM) classification or LN ratio (P > .05 for both), was associated with OS., Conclusion: Detecting occult nodal disease during resection for cN0 MPM is associated with poorer prognosis, with similar survival as cN+ cases, underscoring the importance of routine preoperative pathologic nodal assessment for potentially resectable MPM. The number of involved LNs (rather than current location-based classification) may provide more robust prognostic stratification for future TNM staging., (Copyright © 2020 Elsevier Inc. All rights reserved.)
- Published
- 2020
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