In our analysis of the TCGA breast tumor cohort, we observed significant positive correlations between TREM1 expression and the expression of TREM-1 target cytokines (IL1B, IL8, IL6 and CCL2) and markers of MDSCs and TAMs (CD11B/ITGAM, OLR1, CD14 and CD206/MRC1). This evidence concerns the gene MRC1 and breast neoplasm.