KLRK1 and neoplasm: Given the crucial role of NK cell activity in the immunosurveillance of tumors, which are related with the expression levels of NKG2D and MIC A molecules, we thus detected the molecular transcript expression of NKG2D and MIC A. Figure 3G-H show the results of mRNA expression of NKG2D and MIC A tested by qRT-PCR in hUCMSCs-LV-IL-21 group, hUCMSCs-LV-Vec group, hUCMSCs group and control group, respectively, in the tumor tissues.