The fraction of proliferating (Ki67+) cells for all four immune cell subpopulations (CD3+, CD4+, CD8+, Foxp3+) was numerically higher in basal-like tumours, whereas luminal tumours showed the lowest fraction of proliferating cells (Table 1, Fig. 3a, Supplementary Fig. 16a). The gene discussed is CD4; the disease is neoplasm.