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August 16, 2025

[Guide to the application of the 9th TNM classification for lung cancer : Statement/position paper of the Thoracic Pathology Working Group].

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Position paper recommends structured implementation of the 9th TNM classification for lung cancer, highlighting prognostic differentiation.

The 9th TNM classification improves prognostic differentiation for lung cancer cases, particularly through pN2 and M1c subclassification.
A survey found that only 22% of pathology institutes are currently using the 9th TNM classification, highlighting the need for broader implementation.
Recommendations include using both TNM 8 and 9 documentation during the transition period until January 2026.
Strengthening pleural status documentation as PL0-3 is also advised to enhance clinical practice for lung cancer.

Laffert et al. (2025) studied this question.

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Position paper recommends structured implementation of the 9th TNM classification for lung cancer, highlighting prognostic differentiation.