Table 1.

Basic characteristic of all patients and univariate survival analysis

Variables	Cases, N	Proportion, %	Median OS, months (95% CI)			P value
Age, years	60 (19-82)					0.468
Gender
Male	389	86.3	17.9(16.52-19.28)			0.418
Female	62	13.7	18.7(13.63-23.77)
Smoking
Smoker	370	82.0	18.5(17.05-20.02)			0.392
Never-smoker	81	18.0	16.7(13.95-19.45)
Disease stage
Limited stage	251	55.7	25.4(20.01-30.73)			< 0.001
Extensive stage	200	44.3	14.2(11.67-16.67)
PS
0	257	57.0	19.2(17.49-20.91)			< 0.001
1	158	35.0	18.7(16.63-20.70)
2	36	8.0	9.3(8.06-10.61)
TRT
Yes	171	62.1	19.0(17.50-20.57)			0.003
No	280	37.9		13.6(17.50-20.57)
LDH, U/L
<245	282	62.5		19.8(17.15-22.45)		< 0.001
≥245	169	37.5		13.1(10.88-15.32)
Chemotherapy regimen
Etoposide-based	385	85.4		18.4(16.64-20.09)		0.953
Others	66	14.6		17.5(15.03-19.91)
PCI
Yes	107	23.7		18.6(16.24-21.02)		0.457
No	344	76.3			18.0(16.31-19.76)