Correlation of the infiltration of Foxp3
+ and IDO
+ cells. The correlation of Foxp3 and IDO expression of controls (a), node-negative (b), and node-positive (c) patients is graphed above. There were significant correlations in the expression of both markers between the sentinel lymph nodes of the controls (p = 0.04) and those of patients with tumor-free sentinel lymph nodes (p = 0.003).