MKI67 and neoplasm: Haematoxylin and eosin (H&E) staining and Ki67 immunohistochemical staining of subcutaneous tumour tissues revealed that the P5091‐treated and KD2 tumours exhibited significantly reduced pathological karyorrhexis and Ki67 positivity rates compared to the NC group, whereas the KD1 group showed only a modest reduction (Figure 5D,E).