Additionally, using CCK-8 assay, we detected the viability of residual tumor cells in the co-culture system and found that knockdown of DPP7 decreased the viability of residual tumor cells compared to the control group, while overexpression of DPP7 improved cell viability compared to the control group (Supplementary Fig. 4B-C). This evidence concerns the gene DPP7 and neoplasm.