Table 2. Kaplan-Meier survival estimates by AJCC stage.

Number LN examined	Overall survival (OS)					Cancer-specific survival (CSS)
	1-year survival (%)	5-year survival (%)	Mean (mos)	P value		1-year survival (%)	5-year survival (%)	Mean (mos)	P value
Stage I				<0.001					<0.001
0 LN	69.8	35.9	70.3			78.6	56.7	141.2
1-3 LN	81.8	49.5	103			89.8	69.2	180
4+ LN	87.9	60.4	105			89.9	65.2	124
Stage II				<0.001					<0.001
0 LN	57.8	21.9	49			68.2	36.9	94.2
1-3 LN	79.2	40	75.5			84.7	56	117.3
4+ LN	88.8	72.3	135.8			90.4	76.9	165.6
Stage IIIa				<0.001					<0.001
0 LN	34.2	7.3	20.4			40.3	12.8	34.6
1-3 LN	59.5	19.2	39.4			61.6	26.3	59
4+ LN	64.5	35.8	56.5			68	46.7	70.4
Stage IIIb				<0.001					<0.001
0 LN
1-3 LN	26.6	4.3	30.3			52.9	16.5	47.9
4+ LN	42.6	11.6	51.8			71.9	24	59.2
Stage IV				<0.001					<0.001
0 LN	11.1	1	6.8			13.2	2.4	8.7
1-3 LN	26.6	4.3	12.1			30.2	5.7	15
4+ LN	42.6	11.6	26.1			42.6	14	29.7

LN, lymph node; AJCC, American Joint Commission on Cancer.