Lm-LLO treatment decreases the levels of splenic and tumor infiltrating Treg cells. A. The percentage of CD4+FoxP3+ Treg cells within CD4+ cell population of splenocytes from experimental and control groups. B. The absolute numbers of infiltrated CD45+CD4+FoxP3+ Treg cells standardized per 10e6 of total tumor cells are presented as mean values ± SD. *P < 0.05. Similar results were obtained from two independent experiments.