Table 1.

Demographics and Disease Characteristics of 936 Patients According to Type of Axillary Surgery

Variable	SLNB Alone (n = 600)				SLNB/ALND (n = 336)				P
	No.	%	Median	Range	No.	%	Median	Range
Age at time of axillary surgery, years			56	24-83			52	27-86	< .0001
Age at follow-up, years			62	28-90			56	31-89	< .0001
Follow-up, years			5.0	2.7-8.0			5.1	2.7-7.8	.41
Laterality of surgery									.15
Right	310	52			157	47
Left	290	48			179	53
Type of surgery									< .0001
Conservation	438	73			157	47
Mastectomy	162	27			179	53
Tumor type									< .0001
IFDC	420	70			296	88
IFLC	47	7.8			27	8.0
Mucinous/papillary/medullary/tubular	23	3.8			1	0.3
DCIS only	79	13			8	2.4
DCIS with microinvasion	22	3.7			1	0.3
Metaplastic	2	0.3			0	—
Other	7	1.2			3	0.9
Pathological size, cm			1.0	0-5.0			1.7	0-7.5	< .0001
AJCC T stage
Tis	79	13			8	2.4
T1a	101	17			15	4.5
T1b	158	26			52	15
T1c	212	35			133	40
T2	50	8.3			118	34.
T3	0	—			10	3.0
Total No. nodes excised			3	1-17			19	2-65	< .0001
No. of positive nodes			0	0-3			1	0-32	< .0001
AJCC N stage
N0	555	93			35	10
N0(i+)	16	2.7			9	3.6
N1mi	18	3.0			34	9.2
N1, 1-3 node(s) positive	11	1.8			186	55
N2, 4-9 nodes positive	0	—			50	15
N3, ≥10 nodes positive	0	—			22	6.5

Abbreviations: SLNB, sentinel lymph node biopsy; ALND, axillary lymph node dissection; IFDC, infiltrating ductal carcinoma; IFLC, infiltrating lobular carcinoma; DCIS, ductal carcinoma in situ; AJCC, American Joint Commission on Cancer.