title: Usefulness of pretreatment neutrophil to lymphocyte ratio in predicting disease-specific survival in breast cancer patients.
abstract: OBJECTIVE
  The purpose of this study was to investigate the prognostic impact of pretreatment neutrophil to lymphocyte ratio (NLR) on breast cancer in view of disease-specific survival and the intrinsic subtype.
  
  
  METHODS
  We retrospectively studied patients diagnosed with primary breast cancer that had completed all phases of primary treatment from 2000 to 2010. The association between pretreatment NLR and disease-specific survival was analyzed.
  
  
  RESULTS
  A total of 442 patients were eligible for analysis. Patients with higher NLR (2.5 ≤NLR) showed significantly lower disease-specific survival rate than those with lower NLR (NLR <2.5). Higher NLR along with negative estrogen receptor status and positive nodal status were independently correlated with poor prognosis, with hazard ratio 4.08 (95% confidence interval [CI], 1.62-10.28), 9.93 (95% CI, 3.51-28.13), and 11.23 (95% CI, 3.34-37.83), respectively. Luminal A subtype was the only intrinsic subtype in which higher NLR patients showed significantly poor prognosis (87.7% vs. 96.7%, p=0.009).
  
  
  CONCLUSIONS
  Patients with an elevated pretreatment NLR showed poorer disease-specific survival than patients without elevated NLR, most evident in the luminal A subtype. Further validation and a feasibility study are required before it can be considered for clinical use.
authors.affiliation: Department of Surgery, Yonsei University Wonju College of Medicine, Wonju, Korea.
authors.forename: Hany
authors.initials: H
authors.lastname: Noh
authors.forename: Minseob
authors.initials: M
authors.lastname: Eomm
authors.forename: Airi
authors.initials: A
authors.lastname: Han
keywords: Breast neoplasms; Lymphocytes; Neutrophils