. 2018 Jan 15;10(1):292–303.

Table 1.

The homogeneity analysis of AJCC 8^th TNM staging system

Classfication	T	N	M	No. of patients (%)	No. of events	3-year survival rate (%)	5-year survival rate (%)	Log-rank χ² value	P
0	Tis	N0	M0	0
IA	T1	N0	M0	22 (4.1)	1	95.45	95.45
IB				62 (11.5)	5	93.59	87.55	0.386	0.534
	T1	N1	M0	2 (0.4)	0	100	100
	T2	N0	M0	60 (11.1)	5	93.30	86.86
IIA				19 (3.5)	7	61.18	50.05	0.007	0.931
	T1	N2	M0	6 (1.1)	2	63.63	63.63
	T2	N1	M0	13 (2.4)	5	60.58	45.43
	T3	N0	M0	0
IIB				73 (13.5)	15	85.39	61.78	1.545	0.214
	T1	N3a	M0	0
	T2	N2	M0	7 (1.3)	0	100	100
	T3	N1	M0	0
	T4a	N0	M0	66 (12.2)	15	84.04	58.80
IIIA				185 (34.3)	90	53.88	38.79	12.993	0.005
	T2	N3a	M0	4 (0.7)	1	75.0	0
	T3	N2	M0	0
	T4a	N1	M0	79 (14.7)	33	59.45	46.59
	T4a	N2	M0	94 (17.5)	50	51.75	33.94
	T4b	N0	M0	8 (1.4)	6	11.90	0
IIIB				89 (16.5)	61	34.73	20.36	1.818	0.611
	T1	N3b	M0	0
	T2	N3b	M0	1 (0.2)	1	0	0
	T3	N3a	M0	0
	T4a	N3a	M0	53 (9.8)	36	37.28	22.37
	T4b	N1	M0	15 (2.8)	11	23.05	23.05
	T4b	N2	M0	20 (3.7)	13	39.11	13.04
IIIC				43 (7.9)	35	16.30	9.78	4.673	0.097
	T3	N3b	M0	0
	T4a	N3b	M0	19 (3.5)	17	0	0
	T4b	N3a	M0	20 (3.7)	14	32.5	19.5
	T4b	N3b	M0	4 (0.7)	4	0	0
IV	Any T, N		M1	47 (8.7)	45	5.91	0
	Overall			540 (100)	259

0 in italic indicates the subgroup that no patients survive after the second and fourth year after surgery. P-value in bold indicates that the survival rate of the subgroup was significantly different.