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Pathological response of axillary lymph node after PST
| Axillary lymph node response | Definition |
| PST, primary systemic therapy. | |
| N-A | Evidence of therapeutic effect, no metastatic disease |
| N-B | No nodal metastasis or therapeutic effect |
| N-C | Evidence of therapeutic effect, but nodal metastasis still present |
| N-D | Viable metastatic disease, no therapeutic effect |
