Prognostic assessment of different metastatic lymph node staging methods for gastric cancer after D2 resection

Table 4 Five-year overall survival of patients with ≤ 15 tested lymph nodes based on positive lymph nodes and metastatic lymph node ratio staging system

		MLR 0		MLR 1		MLR 2		MLR 3		MLR 4		χ2	P value
		n	5-YSR	n	5-YSR	n	5-YSR	n	5-YSR	n	5-YSR
< 10 LN	pN 0	59	76.30%	-	-	-	-	-	-	-	-	-	-
	pN 1	-	-	8	50%	14	57.10%	2	0%	3	0%	22.293	0
	pN 2	-	-	-	-	4	50%	22	31.80%	3	33.30%	0.51	0.775
	pN 3a	-	-	-	-	-	-	3	66.70%	8	37.50%	0.78	0.377
	χ2	-		-		0.258		9.278		1.658
	P	-		-		0.611		0.098		0.437
10-15 LN	pN 0	56	80.40%	-	-	-	-	-	-	-	-	-	-
	pN 1	-	-	24	62.50%	-	-	-	-	-	-	-	-
	pN 2	-	-	1	100%	20	50%	18	44.40%	-	-	0.755	0.686
	pN 3a	-	-	-	-	-	-	23	17.40%	10	20%	0.068	0.794
	χ2	-		0.836		-		3.613		-
	P	-		0.658		-		0.057		-

MLR: Metastatic lymph node ratio; 5-YSR: 5-year survival rate; LN: Examined lymph nodes; pN: Positive lymph nodes.