Enhanced Suppressive Activity of Regulatory T Cells in the Microenvironment of Malignant Pleural Effusions

Figure 4

Frequencies of CD4⁺CD25⁺CTLA-4⁺ cells in three cytologically determined groups of pleural effusions: malignant effusions with malignant cells (I), malignant effusions without malignant cells (II), and nonmalignant pleural effusions (III).