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New T1 classification

  • Peter M. F. Lin
  • Michael K. HsinEmail author
Special Edition Diagnosis and Treatment for Early Stage Non-small Cell Lung Cancer
  • 32 Downloads

Abstract

The IASLC staging and Prognostic Factor Committee proposed new changes to the descriptors for the 8th edition of the Tumour Node Metastasis Staging for Lung Cancer. The T1 descriptor changes include (1) T1 tumours are subclassified into T1a (< 1 cm), T1b (> 1 to < 2 cm), T1c (> 2 to < 3 cm). The corresponding changes are introduced to the overall staging: T1aN0M0 = Stage IA1; T1bN0M0 = Stage IA2; T1cN0M0 = Stage IA3. (2) The introduction of the pathological entities Adenocarcinoma-In-Situ (AIS), Minimally Invasive Adenocarcinoma, and Lepidic Predominant Adenocarcinoma. The corresponding changes on the T descriptor are as follows: Adenocarcinoma-in situ is coded as Tis (AIS); Minimally Invasive Adenocarcinoma is coded as T1a(mi). In this review, the basis for these changes will be described, and the implications on clinical practice will be discussed.

Keywords

TNM T1 classification, 8th edition Lung cancer 

Notes

Compliance with ethical standards

Conflict of interest

All authors declare that they have no conflict of interest.

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Copyright information

© The Japanese Association for Thoracic Surgery 2019

Authors and Affiliations

  1. 1.Department of Cardiothoracic SurgeryQueen Mary HospitalPok Fu LamHong Kong

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