Table 3.

Disease features: stage

Reference	Tx	T1	T2	T3	T4	N0	N1	N2	N3	I	II	III	IV	III/IV
[18]	0	8	20	14	20	ns	ns	ns	ns	0	10 (16%)	18 (29%)	34 (55%)	52 (84%)
[19]	0	3	9	6	8	3	7	16	0	0	1 (3%)	7 (27%)	18 (70%)	25 (97%)
[20]	0	7	36	52	27	14	21	80	7	0	0	ns	ns	122 (100%)
[21]	ns	ns	ns	ns	ns	ns	ns	ns	ns	0	0	16 (31%)	35 (69%)	51 (100%)
[22]	0	0	0	20	50	ns	ns	ns	ns	0	8 (11%)	43 (52%)	19 (27%)	62 (89%)
[23]	0	22	25	17	18	10	22	43	7	4 (5%)	12 (15%)	30 (36%)	36 (44%)	66 (80%)
[24]	ns	ns	ns	ns	ns	ns	ns	ns	ns	3 (3%)	1 (1%)	15 (16%)	70 (80%)	85 (96%)
[25]	0	0	34	16	20	29	10	18	13	ns	ns	ns	ns	ns
[26]	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns	23 (30%)	55 (70%)	78 (100%)
[27]	0	26	37	13	32	51	14	40	3	18 (17%)	20 (18%)	19 (18%)	51 (47%)	70 (65%)
[28]	0	6	31	27	11	0	11	59	5	0	0	10 (13%)	65 (87%)	75 (100%)
[29]	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
[30]	0	0	13	16	6	13	4	16	2	0	4 (11%)	10 (29%)	21 (60%)	31 (89%)
[31]	0	4	28	27	10	16	10	39	4	0	6 (9%)	18 (26%)	45 (65%)	63 (91%)
[32]	0	6	25	31	10	9	11	47	5	0	0	18 (25%)	54 (75%)	72 (100%)
[34]	0	0	19	49	17	26	15	44	0	0	0	33 (39%)	52 (61%)	85 (100%)
[35]	ns	ns	ns	ns	ns	ns	ns	ns	ns	0	2 (4%)	11 (23%)	34 (73%)	45 (96%)
[36]	ns	ns	ns	ns	ns	ns	ns	ns	ns	0	0	4 (5%)	82 (95%)	86 (100%)
[37]	0	2	11	43	25	28	15	38	3	0	0	32 (39%)	49 (61%)	81 (100%)
[38]	0	32	92	78	85	30	32	190	35	0	0	54 (19%)	233 (81%)	287 (100%)
[39]	0	14	39	23	24	4	12	80	4	ns	ns	ns	ns	ns
[40]	0	0	29	26	19	0	0	ns	6	0	0	ns	ns	74 (100%)
[42]	7	ns	ns	ns	ns	0	0	119	6	0	0	ns	ns	125 (100%)
[43]	0	14	ns	ns	ns	0	19	ns	ns	7	ns	ns	ns	ns
[44]	0	2	10	27	37	12	7	54	3	1 (1%)	1 (1%)	11 (15%)	63 (83%)	74 (98%)

ns not stated