FOXP3 and neoplasm: These data corroborated our findings in the MCA tumor model, as again a significantly higher proportion of tumor derived Foxp3+ Tregs expressed CD69 (mean of 37.1% ± 9.3 SEM) relative to tumor derived Foxp3− Tconv (mean of 13.9% ± 2.3 SEM) (Figure 4A).