To evaluate the survival of human G-MDSCs within the G-MDSC/BC xenografts, we analyzed the expression of the human-specific pan-myeloid cell marker CD11b, anti-inflammatory myeloid cell marker CD163, and MDSC myeloid cell marker S100A9 (Allaoui et al, 2016) in xenografts. This evidence concerns the gene S100A9 and breast cancer.