The overall survival in the metaplastic carcinoma group was significantly worse than in the control group. As regards to disease-free survival, there was no statistically significant difference between the two groups.
IMNs can be quickly and easily removed via the breast incision with insignificant risk and no increase in postoperative hospitalization. The patients with a positive IMN migrated from N0 (4 cases) or N1 (10 cases) to N3, prompting modification of both local (radiotherapy to internal mammary chain) and systemic treatment; without IMN sampling, they would have been understaged.
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