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[Clinical Significance of the Curative Effect after Neoadjuvant Chemotherapy for Triple-Negative Breast Cancer-Correlation to Prognosis].

We investigated factors related to the recurrence and prognosis of patients with triple-negative breast cancer (TNBC)after neoadjuvant chemotherapy(NAC). Of the 545 patients who underwent surgery after NAC between January 2013 and December 2016, 131 patients had TNBC. An analysis of each TNBC case indicated that the presence or absence of clinical lymph node metastasis(cN)before treatment might be a predictive factor of prognosis. There were 57(43.5%)pathological complete response(pCR)(ypT0 or ypTis/N0)cases after NAC. Overall survival(OS)and disease free survival(DFS) were significantly better in pCR cases than in non-pCR cases. However, recurrence was observed in 8 of 57(14%)pCR cases and 29 of 74(39%)non-pCR cases. The factors defining DFS from the univariate analysis of the non-pCR group were cN, ypT, ypN, and vascular invasion. The multivariate analysis of these factors suggested that residual cN and vascular invasion might be independent factors predicting DFS. Residual vascular invasion was found to predict OS, and was considered to be a poor prognostic factor.