Table 1.

Clinical characteristics.

Characteristics	Training set	Test set	p-value
Number	130	56
Gender
Male	109 (83.8%)	50 (89.3%)	0.334
Female	21 (16.2%)	6 (10.7%)
Age	62 (37–80)	62 (43–78)	0.635
Stage
Limited stage	47 (36.2%)	19 (33.9%)	0.771
Extensive stage	83 (63.8%)	37 (66.1%)