Table 2.
Clinical and pathologic characteristics of SLNB for subgroups based on clinical suspicion of lymph node metastasis
| Characteristics | NSI* (n=147) | SI* (n= 176) | P(Chi-square test) |
|---|---|---|---|
| Mean age ± SD |
51.90 ± 9.99 |
50.35 ± 9.60 |
0.790 |
| Axillary recurrence |
|
|
0.152 |
| No |
146 |
171 |
|
| Yes |
1 |
5 |
|
| Recurrence |
|
|
0.017 |
| No |
143 |
159 |
|
| Yes |
4 |
16 |
|
| T stage |
|
|
0.022 |
| pT1 |
112 |
120 |
|
| pT2 |
34 |
45 |
|
| pT3 |
1 |
11 |
|
| N stage |
|
|
0.002 |
| pN0 |
129 |
127 |
|
| pN1 |
17 |
35 |
|
| pN2 |
1 |
7 |
|
| pN3 |
0 |
7 |
|
| Stage |
|
|
0.002 |
| Stage I |
101 |
98 |
|
| Stage IIA |
37 |
41 |
|
| Stage IIB |
8 |
21 |
|
| Stage IIIA |
1 |
9 |
|
| Stage IIIC |
0 |
7 |
|
| Size of tumor, cm, mean ± SD |
1.58 ± 0.89 |
2.06 ± 1.91 |
0.463 |
| Histology |
|
|
0.013 |
| G1 |
53 |
47 |
|
| G2 |
74 |
73 |
|
| G3 |
19 |
43 |
|
| Nuclear |
|
|
0.005 |
| G1 |
28 |
22 |
|
| G2 |
100 |
103 |
|
| G3 |
18 |
45 |
|
| ER |
|
|
0.009 |
| Negative |
33 |
63 |
|
| Positive |
114 |
113 |
|
| PR |
|
|
0.167 |
| Negative |
48 |
71 |
|
| Positive |
98 |
105 |
|
| IHC |
|
|
0.086 |
| Negative/1+ |
81 |
92 |
|
| 2+ |
40 |
38 |
|
| 3+ |
23 |
45 |
|
| Lymphovascular invasion |
|
|
0.013 |
| No |
113 |
113 |
|
| Yes | 34 | 63 |
*Clinically suspicious for axillary LN metastasis on preoperative imaging techniques (SI) patients are those with any of preoperative imaging techniques, including US, MRI, and PET scan, who were suspected of axillary LN metastasis, and NSI are those not suspected of LN metastasis.ER,estrogen receptor; PR,progesterone receptor; IHC,immunohistochemistry.