Table 2. Tumour characteristics (n=64).

	Numbera	Valid %
Other histological component
Adenocarcinoma	13	21.0
Squamous cell carcinoma	9	14.5
Anaplastic carcinoma	1	1.6
Pure SmCC	39	62.9
T stage
I	5	9.8
II	9	17.7
III	25	49.0
IV	12	23.5
N status
N+	34	66.7
N0	17	33.3
M status
M1	35	55.6
M0	28	44.4
Sites of metastases at presentationb
Liver	22	37.3
Lung	6	10.5
Adrenal	1	1.8
Peritoneum	9	15.2
Soft tissue	7	12.3
Bone	6	10.3
Brain	1	1.8
Number of metastatic sites
0	28	44.4
1	11	17.5
2	13	20.6
⩾3	11	17.5
TNM stagec
I	4	6.8
II	9	15.2
III	11	18.6
IV	35	59.3
Extent
Limited	33	52.4
Extensive	30	47.6
SmCC=small-cell carcinoma.

^aData were missing with regard to other histological component (2 patients), T stage (13), N status (13), M status (1), number of metastatic sites (1), TNM stage (5) and extent of disease (1).

^bInvolvement of the following sites was not specified: liver (5 patients), lung (7), adrenal (8), peritoneum (5), soft tissue (7), bone (6) and brain (8).

^cAccording to the 2002 AJCC staging system.