Author of

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  MA13 - Interventional Pulmonology (ID 914)

  • Event: WCLC 2018
  • Type: Mini Oral Abstract Session
  • Track: Interventional Diagnostics/Pulmonology
  • Presentations: 1
  • Moderators:
  • Coordinates: 9/25/2018, 10:30 - 12:00, Room 206 AC

  • 26011

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    MA13.05 - The Canada Lymph Node Sonographic Score: National Validation of a Sonographic Score to Determine Mediastinal Lymph Node Malignancy (ID 12084)

    11:00 - 11:05  |  Author(s): Forough Farrokhyar
    • Abstract
    • Presentation
    • Slides

    Background
    

    At the time of endobronchial ultrasound (EBUS) staging for Non-Small Cell Lung Cancer (NSCLC), 6 ultrasonic criteria (Fig. 1) are used to assign a Lymph Node Sonographic Score (LNSS) that is predictive of malignancy. The LNSS has not gained widespread use due to lack of research demonstrating its validity and reliability among endoscopists. We hypothesized that LNSS correlates well with the probability of malignancy, potentially guiding decisions for lymph node (LN) biopsy.

    

    a9ded1e5ce5d75814730bb4caaf49419 Method
    

    We conducted a prospective study to assess the validity and reliability of the LNSS. The validation cohort comprised LN that were video-recorded from patients with NSCLC, and assigned a LNSS by an experienced endoscopist. Videos were then circulated to thoracic surgeons and interventional respirologists across Canada, who were asked to assign a score to each LN. All raters had demonstrated proficiency using our online education module, were blinded to staging information, and to each other. Each LN was scored by at least 3 independent raters. Pathological specimens were used as the gold standard for determination of malignancy. Regression, receiver operator curve (ROC), and Gwet’s AC1 analyses were used to test LNSS score performance, discriminatory capacity, and inter-rater reliability.

    4c3880bb027f159e801041b1021e88e8 Result
    

    A total of 300 LNs (18% malignant) from 140 patients were analyzed by 11 endoscopists across 7 Canadian centres. LNSS=0 was strongly predictive of benign LN (NPV= 95.69%, OR=49.2, p=0.001). LNSS ≤2.5 (OR=44, p=0.001) was determined as the cutoff for malignancy based on ROC analysis (c= 0.7757, 95%CI: 0.70281-0.84853). Inter-rater reliability for LNSS=0 was 0.8553 (95%CI:0.8158-0.8947, p=0.0001) and 0.46 for LNSS ≤2.5 (95%CI=0.3521-0.5012, p=0.0001).

    8eea62084ca7e541d918e823422bd82e Conclusion
    

    The Canada LNSS shows excellent performance in identifying benign LN at the time of EBUS. A cutoff ≤2.5 has the potential to inform decision-making regarding biopsy or repeat biopsy/mediastinoscopy if the initial results are inconclusive. Further teaching and education are required to improve inter-rater reliability.

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