Table 5. Survival impact of lymph node dissection according to multivariate analysis.

Item	All patients				Patients with positive nodes
	All patients		With LND		All patients		With LND
	HR	95% CI	HR	95% CI	HR	95% CI	HR	95% CI
Agea	1.005*	1.001–1.009	1.005*	1.000–1.010	NS		NS
T stage (vs. T0–T2)	1.276**	1.115–1.461	NS		1.202*	1.037–1.392	NS
Grade (vs. I–II)	1.261**	1.085–1.464	1.222*	1.031–1.448	1.250*	1.053–1.483	NS
Tumor extent (vs. Localized)
Further extent	1.459**	1.155–1.843	1.616**	1.223–2.134	1.589**	1.214–2.080	1.583**	1.184–2.116
Mets at diag (vs. DNs)
OPI	1.326**	1.125–1.562	1.255**	1.052–1.496	1.198*	1.006–1.427	NS
OPI and DNs	1.433**	1.132–1.813	NS		1.405**	1.088–1.815	NS
Radi & Surgery (vs. Surgery alone)	0.724**	0.615–0.853	0.709**	0.593–0.848	0.637**	0.530–0.766	0.644**	0.531–0.781
LND (vs. Not performed	0.811*	0.680–0.967	NA		0.628**	0.456–0.864	NA
LNDa	NA		0.969**	0.959–0.978	NA		0.969**	0.960–0.979
PLNa	NA		1.041**	1.029–1.052	NA		1.037**	1.025–1.050

Survival impact of undergoing lymph node dissection and the number of dissections as determined by multivariate analysis in all distant metastatic gastric cancer patients, and patients with positive nodes.

^aContinuous variable

^*P < 0.05

^**P < 0.01.

Abbreviations: HR, hazard ratio; CI, confidence interval; LND, lymph node dissection; PLN, positive lymph node; NA, not applicable; NS, not significance; Mets, metastasis status; diag, diagnosis; OPI, organs or peritoneal involved; DNs, distant nodes; Radi, radiation; Surg, surgery.