S100A9 and triple-negative breast carcinoma: The overall infiltration of CD15+ cells (0–3) was associated with ERα negativity (P = 0.048), triple-negative breast cancer (TNBC) subtype (P = 0.018), and also the presence of the anti-inflammatory myeloid cell marker CD163 (P = 0.020), and the MDSC and neutrophil marker S100A9 (P = 0.019) (Table 2).