CD4 and breast cancer: We observed small but significant differences in the proportions of CD4+ T cells (0.14 vs 0.17, p = 0.005) and granulocytes (0.66 vs 0.61, p = 0.0001) between BC cases and controls, but no differences in the proportion of CD8+ T, NK, B cells or monocytes (Supplementary Table S1).