Correlation between pre-treatment NLR in the levels of circulating CD11b+CD14-HLA-DR− cells and ALDH1. (a) Flow cytometric analysis of circulating CD11b+CD14-HLA-DR− cells in isolated peripheral blood mononuclear cells (PBMCs). HLA-DR−CD11b+ cells were gated, and the CD14 negative population was then selected. Representative data from two cancer patients are shown (upper row, the patient with pretreatment NLR < 3; lower row, the patient with pretreatment NLR ≥ 3). Elevated circulating levels of CD11b+CD14-HLA-DR− cells associated with the higher risk of death (b), disease recurrence after treatment (c), and ALDH1 positive staining (d). (e) Positive correlation between the levels of CD11b+CD14−HLA-DR− cells and pre-treatment NLR in the peripheral circulation.