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Types of Cancer > Lung Cancer > Diagnosis, Screening, and Staging
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| The Revised International Staging System for Lung Cancer |
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The Revised International System for Staging Lung Cancer was adopted in 1997 by the American Joint Committee on Cancer (AJCC) and the Union Internationale Contre le Cancer. These revisions were made to provide greater specificity for patient groups. Stage I is divided into 2 categories by the size of the tumor: IA (T1, N0, M0) and IB (T2, N0, M0). Stage II is divided into 2 categories by the size of the tumor and by the nodal status: IIA (T1, N1, M0) and IIB (T2, N1, M0). T3N0 has been moved from stage IIIA in the 1986 version of the staging system to stage IIB. The other change has been to clarify the classification of multiple tumor nodules. Satellite tumor nodules in the same lobe as the primary lesion that are not lymph nodes should be classified as T4 lesions. Intrapulmonary ipsilateral metastasis in a lobe other than the lobe containing the primary lesions should be classified as an M1 lesion (stage IV).
The AJCC has designated staging by TNM classification.
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