APOE and breast cancer: Besides, we identified two clusters of myeloid cells with highly expressed genes that were involved in fatty acid synthesis (APOE+ and FABP5+) (Figure 4F), and found that multiple myeloid cells with a large number of Scissor− cells may be acted as protective factors for the survival of breast cancer patients (Figure 4G), especially dendritic cells had the highest percentage, which is consistent with their roles in promoting tumor killing by presenting antigen.