Figure 4. Arginase 1 MFI is higher in tumor-associated than blood-derived myeloid cells. Mean fluorescence intensity (MFI) of ARG1 among total myeloid cells (A) or CD14⁺ myeloid cells (B) from the peripheral blood (n = 27), tumors (n = 17) or sentinel lymph nodes (SLNs, n = 17) of breast cancer patients.