To confirm that oHSV1-hTERT-GFP-labeled cells were cancer cells and not normal cells, SMMC-7721 cancer cells were spiked into a peripheral blood sample from a healthy donor, exposed to oHSV1-hTERT-GFP, and CD45–/GFP+ and CD45+/GFP– cells isolated (Figure 4A). This evidence concerns the gene PTPRC and cancer.