Table 2. Interaction between surgical parameters and treatment modalities in stage T1N0M0 SCLC.

Variables	Oligo-modality cohort (n=146)				Bi-modality cohort (n=119)				Tri-modality cohort (n=72)
	HR	95% CI	Pa		HR	95% CI	Pa		HR	95% CI	Pa
Resection type
Sublobectomy	Reference				Reference				Reference
Lobectomy	1.058	0.640–1.751	0.826		0.569	0.315–1.027	0.061		0.385	0.163–0.909	0.030
ELN
≤7	Reference				Reference				Reference
>7	0.704	0.436–1.136	0.151		0.660	0.383–1.136	0.134		0.722	0.365–2.010	0.857

^a, univariate Cox analysis. SCLC, small-cell lung cancer; ELN, examined lymph nodes; HR, hazard ratio; CI, confidence interval.