The results revealed a reduced number of Ki67‐positive cells, and a significantly increased number of caspase‐3‐positive cells in miR‐200a‐overexpressing C4‐2B tumor xenografts (Figure 3G)We then measured the effect of miR‐200a on tumor metastasis in vivo, by injecting C4‐2B cells transfected with miR‐200a or NC into the tail veins of nude mice. The gene discussed is MKI67; the disease is neoplasm.