Interestingly, analysis of triple immunostaining experiments showed a higher number of Ki67‐positive tumor cells, particularly around vascular pericytes, in Osimertinib‐treated HCC827 and PC co‐injected tumors compared to Osimertinib‐treated tumors derived solely from the injection of HCC827 cells (Figure 2O). The gene discussed is MKI67; the disease is neoplasm.