Lm-LLO treatment decreases the levels of splenic and tumor infiltrating MDSC. A. The percentage of splenic CD11b+Gr-1+ MDSC from treated and control mice C57BL/6 mice (n = 5). B. The absolute numbers of infiltrated CD45+CD11b+Gr-1+ MDSC standardized per 10e6 of total tumor cells are presented as mean values ± SD. *P < 0.05. Similar results were obtained from two independent experiments.