All tumors showed positive reactivity for CD31 (Figure 6E) and vWF (Figure 6F), and positive reactivity for Ki-67 antigen of MIB-1 clone (Figure 6G) was observed in the nuclei of the tumor cells, but no positive reactions were observed in the surrounding murine tissues such as the epidermal basal cells. The gene discussed is MKI67; the disease is neoplasm.