| Group A | Group B | All | |
|---|---|---|---|
| pN0, no metastasis identified; pN0(i+), isolated tumour cells detected by serial sectioning and/or immunohistochemistry; pN1a, micrometastasis, not larger than 2 mm; pN1bi, macrometastasis (>2 mm) limited to 1–3 lymph nodes; pN1bii, macrometastasis in more than 3 lymph nodes; pN1biii, macrometastasis with extracapsular invasion; pN1biv, macrometastasis larger than 2 cm; pN2, metastatic conglomerate of several involved nodes (3 lymph nodes in this particular case, sitting deep in the axilla and impalpable). | |||
| pN0 | 49 | 76 | 125 |
| pN0(i+) | 9 | 5 | 14 |
| pN1a | 9 | 10 | 18 |
| pN1bi | 27 | 21 | 49 |
| pN1bii | 0 | 0 | 0 |
| pN1biii | 25 | 10 | 35 |
| pN1biv | 3 | 1 | 4 |
| pN2 | 1 | 0 | 1 |
| All | 123 | 123 | 246 |