Table 2.
Pathology results of SLNB and excision specimen of the 910 patients
| MUMC N = 154 | CWZ N = 171 | NKI N = 428 | CZE N = 157 | Total N = 910 | |
|---|---|---|---|---|---|
| SLNB | |||||
| In total performed (%) | 105 (68.2) | 76 (44.4) | 177 (41.4) | 113 (72.0) | 471 (51.8) |
| No metastases | 92 (87.6) | 70 (92.2) | 159 (89.8) | 106 (93.8) | 427 (90.7) |
| Isolated tumour cells | 11 (10.5) | 3 (3.9) | 3 (1.7) | 1 (0.9) | 18 (3.8) |
| Micrometastases | 2 (1.9) | 3 (3.9) | 8 (4.5) | 1 (0.9) | 14 (3.0) |
| Macrometastases | – | _ | 7 (4.0) | 5 (4.4) | 12 (2.5) |
| Final pathology | |||||
| DCIS excision (%) | |||||
| No residual | 6 (3.9) | 12 (7.0) | 37 (8.6) | 13 (8.3) | 68 (7.5) |
| DCIS grade 1 | 17 (11.0) | 15 (8.8) | 94 (22.0) | 24 (15.3) | 150 (16.5) |
| DCIS grade 2 | 55 (35.7) | 44 (25.7) | 164 (38.3) | 34 (21.6) | 297 (32.6) |
| DCIS grade 3 | 76 (49.4) | 100 (58.5) | 133 (31.1) | 86 (54.8) | 395 (43.4) |
| Invasive cancer (%) | 27 (17.5) | 24 (14.0) | 75 (17.5) | 26 (16.6) | 152 (16.7) |
| IDC grade 1 | 9 (33.3) | 7 (29.2) | 26 (34.7) | 7 (26.9) | 49 (32.2) |
| IDC grade 2 | 10 (37.1) | 11 (45.8) | 27 (36.0) | 12 (46.2) | 59 (38.8) |
| IDC grade 3 | 4 (14.8) | 4 (16.7) | 12 (16.0) | 2 (7.7) | 22 (14.5) |
| Other | 4 (14.8) | 2 (8.3) | 10 (13.3) | 5 (19.2) | 22 (14.5) |
MUMC Maastricht University Medical Centre, Maastricht, CWZ Canisius-Wilhelmina Hospital, Nijmegen, NKI Netherlands Cancer Institute, Amsterdam, CZE Catharina Hospital, Eindhoven, SLNB Sentinel lymph node biopsy, DCIS Ductal carcinoma in situ, IDC Invasive ductal carcinoma