Overall, the mean and maximum tumor-to-heart ratios of 89Zr-DFO-CD4 and 89Zr-DFO-CD8a were in agreement with flow cytometric analysis of CD4+ (Figure S6C-D, top panel) and CD8a+ (Figure S6C-D, bottom panel) numbers across syngeneic mouse tumor models. This evidence concerns the gene CD4 and neoplasm.