Figure 5A shows the annotation of various immune cell types in breast cancer. PSMB8, BCL2, and PSME2 were expressed in tumor cells, stromal cells, and immune cell subsets (Figures 5B, C). PSMB8 was primarily expressed in macrophages, BCL2 in B cells, and PSME2 in monocytes (Figures 5D, E). Here, PSME2 is linked to breast cancer.