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Table 1 TNM for NSCLC according to the 7th classification [23]

From: The role of general practice in routes to diagnosis of lung cancer in Denmark: a population-based study of general practice involvement, diagnostic activity and diagnostic intervals

T/M N0 N1 N2 N3
T1a (≤2 cm) IA IIA IIIA IIIB
T1b (>2 cm) IA IIA IIIA IIIB
T2a (≤5 cm) IB IIA IIIA IIIB
T2b (>5 cm) IIA IIB IIIA IIIB
T3 (>7 cm) IIB IIIA IIIA IIIB
T3 (invasion) IIB IIIA IIIA IIIB
T3 (same lobe nodules) IIB IIIA IIIA IIIB
T4 (extension) IIIA IIIA IIIB IIIB
T4 (pleural effusion) IV IV IV IV
M1a (ipsilateral lung) IIIA IIIA IIIB IIIB
M1a (contralateral lung) IV IV IV IV
M1b (distant) IV IV IV IV
  1. The T component describes the extent of the primary tumour in terms of both size and local invasion. The N component describes regional lymph node involvement and the M component denotes whether distant metastases are present (M1) or not (M0).