Ki67 identified proliferating CD8+ T cells (median 4.3/mm2, 14.7% of CD8+ cells, Figure 1B–E), CD4+ T cells (median 1.3/mm2, 31.1% of CD4+ cells), and B cells (median 0.3/mm2, 8.1% of CD20+ cells) (Figure 1B) as well as proliferating tumor cells. The gene discussed is CD4; the disease is neoplasm.