Table 1. Clinical and pathological characteristics of 632 patients with breast cancer in sentinel lymph node study.

Variable	n	%
Age (years)
Median (range)	55 (28–95)	-----
Histology
Ductal	518	82.0
Lobular	47	7.4
Other	67	10.6
T State
1	409	64.7
2	204	32.3
3	16	2.5
4	3	0.5
ER and/or PR
Positive	559	88.4
Negative	73	11.6
HER2
Positive	56	8.9
Negative	506	80.1
Unknown	70	11.1
HG 3
Yes	211	33.4
No	377	59.7
Unknown	44	7.0

ER: estrogen receptor,

PR: progesterone receptor,

HG: histologic grade.