Table 5. The associations between the clinical variables and PFS as well as OS were studied by log-rank test.

Variables	Median PFS	95%CI	P	Median OS	95%CI	P
Smoke status
Non-smokers	5.87	5.46–6.11	0.054	8.94	8.25–10.41	0.004
Smoker	5.6	5.37–5.95		8.18	7.01–9.56
Stage
III	5.68	5.27–5.67	0.185	8.45	8.23–8.86	0.048
IV	5.65	5.11–5.79		8.37	8.19–8.79
Differentiation
Well	5.53	5.25–5.78	0.071	9.39	8.51–9.98	<0.001
Moderate+Poor	5.51	5.21–5.82		8.54	8.23–9.16
82G/S
GG	5.93	5.22–6.25	0.018	9.49	8.85–10.37	<0.001
GS+SS	5.24	4.88–5.57		8.44	8.13–8.96