New 1997 Staging 5 Year Survival StageD TI NO MO 61 Stage IB 12N0M0 38 Stage IIA TI NI MO 34% Stage lB T2 NI MO 24 T3 NO MO 22% Stage I A T3 NI MO T1-3N2M0 Stage Ilib T4 Anyn mo Anyt N3 MO age Any T Anyn M 10 T= tumor size(1< 3cm, T2 >3cm atelectasis), tumor site(T 3 extension to pleura, chest wall, pericardium or total atelectasis), local involvement (T 4 invasion of mediastinum or pleural effusion) N= lymph node spread N1 bronchopulmonary, N2 (ipsilateral mediastinal) and N3 (contralateral or supraclavicular) M= absence(MO) or presence(M1)of metastasesT= tumor size (T1< 3cm,T2 >3cm + atelectasis), tumor site ( T 3 extension to pleura, chest wall, pericardium or total atelectasis) , local involvement (T 4 invasion of mediastinum or pleural effusion); N= lymph node spread N1 bronchopulmonary, N2 (ipsilateral mediastinal) and N3 (contralateral or supraclavicular); M= absence (M0) or presence (M1) of metastases New 1997 Staging 5 Year Survival Stage I A T1 N0 M0 Stage 1B T2 N0 M0 61 % 38 % Stage IIA T1 N1 M0 Stage IIB T2 N1 M0 T3 N0 M0 34 % 24 % 22 % Stage III A T3 N1 M0 T1-3 N2 M0 13 % Stage III B T4 Any N M0 Any T N3 M0 5 % Stage IV Any T Any N M1 1 %