Table 3. Tumour, node, metastasis (TNM) staging of the study population overall and by histological subtype.

Staging	Overall (N=299), n(%)	Non-small cell (N=254), n(%)	Small cell (N=44), n(%)
IA	3 (1.0)	3 (1.2)	0
IB	0	0	0
IIA	0	0	0
IIB	1 (0.3)	0	0
IIIA	13 (4.3)	13 (5.1)	0
IIIB	18 (6.0)	14 (5.5)	4 (7.4)
IIIC	35 (11.7)	29 (11.4)	6 (11.1)
IVA	149 (49.8)	128 (50.4)	21 (38.9)
IVB	80 (26.8)	67 (26.4)	13 (24.1)