PCNA and neoplasm: Strikingly, the percentage of proliferating cell nuclear antigen (PCNA)‐positive cells from xenograft tumours was significantly higher in TLR4 group than in GFP ctrl group (P < .01), whereas that was significantly lower in TLR4i group than in RNAi ctrl group (P < .01) (Figure 2D, lower pictures; Figure 2E).