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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).