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. 2020 Aug 7;11:1779. doi: 10.3389/fimmu.2020.01779

Table 1.

Characteristics of the studies related to neutrophil-to-lymphocyte ratio.

References Country Study period Cancer type Median age (ys) No. patients low/high NLR Treatment Follow-up Significance of NLR
Noh et al. (32) Korea 2000–2010 Luminal A/B,
HER2-enriched,
TNBC
50 n = 442
NLR < 2.5 (n ≤ 327)
NLR ≥ 2.5 (n = 115)
NR 5.9 ys High NLR indicates lower survival rate (p = 0.009).
Koh et al. (33) Korea 2002–2010 ER/PR-positive,
HER2-enriched
44 n = 157
NLR ≤ 2.25 (n = 91)
NLR > 2.25 (n = 66)
Surgery, NCT 21 mo Univariate analysis indicates high NLR related to lower RFS (p = 0.001) and OS (p < 0.001).
Yao et al. (34) China 2009–2011 Luminal A/B,
ER/PR-positive,
HER2-enriched,
TNBC
50 n = 608
NLR = 2.57; NLR > 2.57
Surgery 5.9 ys High NLR indicates lower 5-year OS.
Pistelli et al. (35) Italy 2006–2012 TNBC 53 n = 90
NLR ≤ 3 (n = 73)
NLR > 3 (n = 17)
NR 53.8 mo Multivariate analysis indicates high pretreatment NLR is correlated with poor DFS (p = 0.03) and OS (p = 0.01).
Ulas et al. (36) Turkey 2009–2014 HER2-enriched 51.4 n = 187
NLR < 2.38 (n = 119)
NLR > 2.38 (n = 68)
Adjuvant transtuzumab 26 mo High pretreatment NLR indicates shorter DFS.
Jia et al. (37) China 2000–2010 ER /PR-positive,
HER2-enriched,
TNBC
47 n = 1,570
NLR > 2 (n = 804)
NLR ≤ 2 (n = 766)
NCT, surgery 79 mo Multivariate analysis indicates low NLR is related to superior DFS (p = 0.004) and (p = 0.022).
Bozkurt et al. (38) Turkey 2002–2013 TNBC 50 n = 85
NLR ≤ 2 (n = 33)
NLR > 2 (n = 52)
Surgery, adjuvant chemotherapy, and radiotherapy 60 mo Multivariate analysis indicates high pretreatment NLR is correlated with poor DFS (p = 0.006) and OS (p = 0.04).
Asano et al. (25) Japan 2007–2013 TNBC 56 n = 177
NLR < 3 (n = 58)
NLR > 3 (n = 119)
NCT 3.4 ys Univariate analysis indicates low NLR is related to favorable prognosis in TNBC patients who achieved pCR (p = 0.044, hazard ratio = 0.06).
Rimando et al. (39) USA 2001–2013 Non-metastatic BC 58 n = 461
NLR ≤ 3.7 (n = 409)
NLR > 3.7 (n = 52)
Radiotherapy, chemotherapy 61 mo High pretreatment NLR indicates poor all-cause mortality, with a multivariable HR of 2.31 (95% CI: 1.10–4.86).
Iwase et al. (40) Japan 2005–2014 TNBC 50.9 n = 89
NRL = 3
Chemotherapy NR High NLR upon recurrence indicates shorter OS recurrence rates (p < 0.05).
Hernandez et al. (41) Spain 2003–2016 Luminal A/B, ER/PR-positive, HER2-enriched, TNBC 49.8 n = 150
NLR = 3.3
NCT, surgery 24 mo Low NLR indicates higher OS (p = 0.024).
Miyagawa et al. (42) Japan 2010–2017 Locally Advanced or Metastatic BC 63 n = 59
NLR < 3 (n = 24)
NLR ≥ 3 (n = 35)
Eribulin NR Low NLR indicates better PFS (p = 0.0032).
Ferroni et al. (43) Italy 2007–2017 Luminal A/B, HER2-enriched, TNBC 57 n = 475
NLR ≤ 2 (n = 245)
NLR > 2 (n = 230)
NCT, chemotherapy, endocrine therapy; trastuzumab regimens 45.6 mo High pretreatment NLR indicates worse DFS (HR = 2.28) and OS (HR = 3.39).
Qiu et al. (44) China 2006–2013 Non-metastatic TNBC 50 n = 406
NLR < 2.85 (n = 210)
NLR ≥ 2.85 (n = 196)
Surgery, NCT, chemotherapy 54.3 mo Low NLR indicates higher OS (p < 0.001) and DFS (p < 0.001).
Iimori et al. (30) Japan 2004–2013 Luminal A/B, HER2-enriched, TNBC 63 n = 34
NLR < 3 (n = 24)
NLR ≥ 3 (n = 10)
Endocrine therapy 38.8 mo Low NLR indicates a prolongation of PFS (p = 0.003) and OS (p = 0.013).
Mando et al. (45) Argentina 2011–2014 Early stage BC 56 n = 85
NRL = 2
Surgery 38.6 mo High NLR indicates lower DFS (p = 0.048).
Lee et al., (46) Korea 2008–2015 TNBC 51 n = 358
NLR ≤ 3.16 (n = 313)
NLR > 3.16 (n = 45)
NCT NR Low NLR indicates superior OS (p = 0.002) and DFS (p = 0.032).
Xuan et al. (19) China 2006–2008 TNBC 50 n = 286
NLR < 2.93 (n = 223)
NLR ≥ 2.93(n = 63)
Surgery NR Low NLR indicates longer DFS (p = 0).
Fujmoto et al. (47) Japan 2005–2016 With high counts of lymphocytes 30.7 n = 889
NLR < 2.72 (n = 582)
NLR >2.72 (n = 307)
Surgery, adjuvant chemotherapies, endocrine therapies NR Low NLR indicates better RFS (p = 0.036).
Imamura et al. (48) Japan 2011–2017 HER2-enriched 53 n = 53
NLR < 2.56 (n = 26)
NLR ≥ 2.56 (n = 27)
Trastuzumab emtansine NR Low NLR at baseline indicates better PFS (p = 0.0001) and OS (p = 0.0296).

NLR, Neutrophil-to-lymphocyte ratio; ER, Estrogen receptor; PR, Progesterone receptor; HER2, Human epidermal growth factor receptor 2; Mo, Months; Ys, Years; DFS, Disease-free survival; OS, Overall survival; PFS, Progression-free survival; RFS, Relapse free survival; pCR, Pathological complete response; TNBC, Triple-negative breast cancer; NCT, Neoadjuvant chemotherapy; NR, Not recorded.