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Reproducibility of the WHO classification of thymomas: practical implications.
P A Zucali1, L Di Tommaso, I Petrini
1Humanitas Cancer Center, Via Manzoni 56, Rozzano, Milan, Italy.
Lung Cancer (Amsterdam, Netherlands)
|January 3, 2013
Summary
The World Health Organization (WHO) classification for thymomas showed only moderate agreement among pathologists, impacting patient management. Improving diagnostic criteria or using consensus conferences can reduce discrepancies in thymoma classification.
Area of Science:
- Oncology
- Pathology
- Thoracic Surgery
Background:
- The World Health Organization (WHO) classification is a potential prognostic marker for thymomas, but its reproducibility has been questioned in prior studies.
- Variability in diagnostic interpretation may affect the reliability of the WHO classification for thymomas.
Purpose of the Study:
- To assess the reproducibility of the WHO classification system for thymomas.
- To evaluate the prognostic implications of the WHO classification in a large cohort of resected thymomas.
Main Methods:
- Four pathologists independently and blindly classified 129 thymic tumors using the WHO classification.
- Inter-observer agreement was assessed using Fleiss' kappa and Cohen's kappa coefficients.
- Disease-related survival (DRS) and progression-free survival (PFS) were analyzed using Kaplan-Meier curves and log-rank tests.
Main Results:
- Complete agreement on WHO classification was observed in only 48.8% of cases, with a moderate overall kappa correlation coefficient of 0.53.
- A web-based consensus review resolved discrepancies in cases with differing diagnoses.
- Thymoma histotype significantly impacted PFS and DRS when classified by at least two pathologists.
Conclusions:
- The reproducibility of the WHO classification for thymomas is only moderate, potentially influencing patient management decisions.
- Implementing consensus conferences, refining diagnostic criteria, or establishing referral centers could improve diagnostic accuracy and reduce variability.
