From Yale: Revised staging system for lung cancer

http://www.ncbi.nlm.nih.gov/pubmed/22054882

Clin Chest Med. 2011 Dec;32(4):741-8.
The revised stage classification system for primary lung cancer.
Boffa DJ.
Source
Thoracic Surgery, Yale University School of Medicine, 330 Cedar Street, BB205, 208062, New Haven, CT 06520, USA.

Abstract
The revised stage classification system has improved the ability of clinicians to estimate prognosis based on specific staging determinations. Several important questions have been addressed, although many remain and will likely fuel the discussion for subsequent revisions. Perhaps more than previous revisions, the current iteration may cause confusion because of the emphasis on stage-specific treatment recommendations. However, prognosis is only 1 of the factors in a multidisciplinary treatment plan, and clinicians are encouraged to apply randomized trial data whenever possible. This global staging effort is testament to the progress that is possible through international collaboration.