Table 1.

Characteristics of patients according to arms of randomization.

	All		ALND arm		SLNB arm		Chi2
	n	%	n	%	n	%	P
Randomization	1855		929		926
Age
≤40	104	5.65	60	6.51	44	4.78	0.256
41–75	1633	88.65	808	87.64	825	89.67
>75	105	5.7	54	5.86	51	5.54
Missing data	13		7		6
pT size
≤10	260	14.32	117	12.90	143	15.73	0.150
10–30	1345	74.06	689	75.96	656	72.17
>30	211	11.62	101	11.14	110	12.10
Missing data	39		22		17
Grade
1	397	22.17	203	22.76	194	21.58	0.205
2	962	53.71	461	51.68	501	55.73
3	432	24.12	228	25.56	204	22.69
Missing data	64		37		27
LVI
No	543	30.99	272	31.12	271	30.87	0.908
Yes	1209	69.01	602	68.88	607	69.13
Missing data	103		55		48
Extracapsular extension
No	1340	78.5	680	79.44	660	77.56	0.344
Yes	367	21.5	176	20.56	191	22.44
Missing data	148		73		75
Endocrine receptors
Negative	165	9.13	87	9.65	78	8.62	0.449
Positive	1642	90.87	815	90.35	827	91.38
Missing data	48		27		21
Her2
Negative	1575	88.58	782	87.77	793	89.40	0.278
Positive	203	11.42	109	12.23	94	10.60
Missing data	77		38		39
Ki67 or MIB1
≤10	594	40.74	274	37.95	320	43.48	0.097
11–20	381	26.13	196	27.15	185	25.14
>20	483	33.13	252	34.9	231	31.39
Missing data	397		207		190
Positive SN number
≤2	1741	97.59	871	97.76	870	97.42	0.649
>2	43	2.41	20	2.24	23	2.58
Missing data	30		16		14
SN status
pN0 (i+)	99	5.91	45	5.36	54	6.46	0.556
pN1mi	471	28.12	242	28.84	229	27.39
pN1macro	1105	65.97	552	65.79	553	66.15
Missing data	180		90		90
Chemotherapy
No	566	31,51	279	31,24	287	31,79	0,883
NAC	53	2,95	28	3,14	25	2,77
AC	1177	65,53	586	65,62	591	65,45
Missing data	59		36		23
Surgery
Conservative	1466	80.15	744	81.31	722	78.99	0.214
Mastectomy	363	19.85	171	18.69	192	21.01
Missing data	26		14		12

T tumor, LVI lympo-vacular invasion, SN sentinel node.