Table 3.

Univariate and multivariate analyses of the effect of prognostic factors on the overall survival of patients with resectable small cell lung cancer

Characteristic	Univariate analysis				Multivariate analysis
	MST (mo)	3-y OS (%)	χ2	P	HR	95% CI	P
Sex			1.260	0.262
Male	36	49.6
Female	NR	66.3
Age			2.029	0.154
> 60	36	73.7
≤ 60	NR	50.0
pT stage			1.821	0.402
T1	NR	65.5
T2	38	51.7
T3	19.7	50.0
pN stage			7.616	0.022
N0	NR	76.5
N1	28.9	58.1
N2	22.3	28.4
Pathologic stage			1.806	0.405
I	NR	72.4
II	24	53.9
III	18	40.7
POCT			3.922	0.048	0.322	0.121-0.856	0.023
Yes	NR	61.1
No	17	40.0
PORT			2.674	0.102
Yes	38	51.2
No	22	35.7
PD-L1 expression			4.592	0.032	0.253	0.092-0.697	0.008
< 0.05	43.2	34.0
≥ 0.05	72.3	NR

Abbreviations: MST, median survival time; 3/5-y, 3/5 year; mo, months; NR, not reached; OS, overall survival; POCT, postoperative chemotherapy; PORT, postoperative radiotherapy; PD-L1, programmed cell death ligand 1.