Meanwhile, immunohistochemistry assay results showed that miR-NC transfected HBMSCs reduced the number of Ki-67 positive cells in tumor tissues compared with that in PBS group (p < 0.05), and miR-99b-5p mimics transfected HBMSCs further reduced Ki-67 positive cells compared with miR-NC transfected HBMSCs (p < 0.01, Figure 6d). This evidence concerns the gene MKI67 and neoplasm.