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Table 1 Relationships between the procedure used for axillary staging and clinicopathological factors

From: Is the sentinel lymph node biopsy more sensitive for the identification of positive lymph nodes in breast cancer than the axillary lymph node dissection?

Variable	ALND (n = 320)		SLNB (n = 830)
Variable	n	%	n	%
Mean age (yrs)	59		58
Mean tumor size (mm)	27		18
Number of foci
Unifocal	245	77	762	92
Multifocal	75	23	68	8
Histologic grade
Grade 1	48	15	192	23
Grade 2	149	47	376	45
Grade 3	123	38	262	32
Tumor location
Lateral	169	53	447	54
Medial	75	24	207	25
Overlapping	62	19	151	18
Retroareolar	13	4	25	3
pT
pT1	112	35	557	67
pT2-3	208	65	273	33
pN
pN0	214	67	601	72
pN > =1	106	33	229	28
Histologic subtype
Ductal	251	78	694	84
Other	69	22	136	16
Lymphovascular invasion
Present	71	22	128	15
Absent	246	77	687	83
Unknown	3	1	15	2
Estrogen receptor
Positive	270	84	743	90
Negative	50	16	87	10
Progesteron receptor
Positive	234	73	668	80
Negative	86	27	162	20
HER-2
Positive	31	10	75	9
Negative	289	90	748	91

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