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Background  The lymphocyte-to-monocyte ratio (LMR) has been used as a parameter reflecting systemic inflammation in several tumors, and is reportedly associated with prognosis in cancer patients. In this study, we evaluated the predictive value of LMR for progression and chemosensitivity in breast cancer patients treated with preoperative chemotherapy.    Methods  LMR was evaluated in 239 patients with breast cancer treated with neoadjuvant chemotherapy (NAC) with 5-fluorouracil, epirubicin, and cyclophosphamide, followed by weekly paclitaxel with or without trastuzumab, and subsequent curative surgery. The correlations between LMR and clinicopathological features, prognosis, and pathological complete response (pCR) rate of NAC were evaluated retrospectively. We also evaluated the predictive value of neutrophil-to-lymphocyte ratio (NLR), and compared the predictive values of LMR and NLR.    Results  We set 6.00 as the cut-off level for LMR based on the receiver operating characteristic (ROC) curve. A total of 119 patients (49.8%) were classified in the high-LMR group and 120 (50.2%) were classified in the low-LMR group. The low-LMR group had significantly worse disease-free survival rate (DFS) in all patients ( p  = 0.005) and in triple-negative breast cancer patients ( p  = 0.006). However, there was no significant correlation between LMR and pCR. Multivariate analysis showed that low LMR was an independent risk factor for DFS ( p  = 0.008, hazard ratio = 2.245). However, there was no significant difference in DFS ( p  = 0.143, log-rank) between patients in the low- and high-NLR groups.    Conclusions  LMR may be a useful prognostic marker in patients with breast cancer.    Electronic supplementary material  The online version of this article (10.1186/s12885-018-5051-9) contains supplementary material, which is available to authorized users.

Predictive value of lymphocyte-to-monocyte ratio in the preoperative setting for progression of patients with breast cancer