Compared to normal breasts, less abundant cell types in breast tumors included naïve B cells, resting CD4 memory T cells, resting NK cells, M2 macrophages, and resting mast cells; more abundant cell types in tumor samples were memory B cells, follicular helper T cells, gamma delta T cells, and M0 and M1 macrophages. The gene discussed is CD4; the disease is neoplasm.