S100A9 and breast cancer: Interestingly, myeloid cells infiltrated within the BC mass were markedly reduced in LSAA/HPUFA-fed mice, as assessed by staining with a S100A9 antibody (Figure 3i), and accordingly pro-inflammatory Nos2 and cytokine mRNAs (i.e., Tnfa, Il1b) were significantly up-regulated (Figure 3j).