These animals were euthanized 30 days after tail vein inoculation of EO771‐Luc, the lungs infiltrated by tumors showing a comparable size were collected, and multiplex stained to identify epithelial tumor cells (epidermal growth factor receptor, EGFR+), myeloid cells (CD68+), and proliferating cells (Ki67+). The gene discussed is CD68; the disease is neoplasm.