ITGAM and melanoma: To correlate the uptake of adoptively transferred [64Cu]PMN- and [64Cu]M-MDSCs to endogenous MDSCs in the examined tumor models, PyMT breast cancer and B16F10 melanoma tumors were further examined for the frequency of endogenous PMN- (Figure 4C) and M-MDSCs (Figure 4D) by flow cytometry according to the expression of CD11b, Ly6C and Ly6G.