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Table 1 Potential predictive factors in relation to SN status

From: Predictive factors for sentinel node metastases in primary invasive breast cancer: a population-based cohort study of 2552 consecutive patients

Determinants Category Total SN negative SN positive
    N % N %
Screening No 1062 719 38.2 343 51.1
Yes 1435 1123 59.7 312 46.5
Unknown 55 39 2.1 16 2.4
Age ≤ 50 499 337 17.9 162 24.1
51–74 1702 1290 68.6 412 61.4
≥75 351 254 13.5 97 14.5
Menopause status Pre 512 348 18.5 164 24.4
Post < 5 years 228 168 8.9 60 8.9
Post ≥ 5 years 1721 1299 69.1 422 62.9
Unknown 91 66 3.5 25 3.7
Tumor size T1 1505 1138 60.5 367 54.7
T2 559 346 18.4 213 31.7
T3 and T4 25 13 0.7 12 1.8
Unknown 463 384 20.4 79 11.8
Tumor type Ductal 1866 1324 70.4 542 80.8
D and L 52 35 1.9 17 2.5
Lobular 304 216 11.5 88 13.1
Other 330 306 16.3 24 3.6
Histological grade I 622 488 25.9 134 20.0
II 1112 807 42.9 305 45.5
III 790 563 29.9 227 33.8
Unknown 28 23 1.2 5 0.7
Estrogen receptor Positive 2144 1538 81.8 606 90.3
Negative 279 218 11.6 61 9.1
Unknown 129 125 6.6 4 0.6
Progesterone receptor Positive 1851 1320 70.2 531 79.1
Negative 571 436 70.2 531 79.1
Unknown 130 125 6.6 5 0.7
HER-2 status Negative 1466 1041 55.3 423 63.0
Positive 240 174 9.3 66 9.8
Unknown 848 666 35.4 182 27.1
Multifocality No 1570 1184 62.9 386 57.5
Yes 352 208 11.1 144 21.5
Unknown 630 489 26.0 141 21.0
Vascular invasion No 1324 1056 56.1 268 39.9
Yes 184 87 4.6 97 14.5
Unknown 1044 738 39.2 306 45.6