When the fluorescence dye Cy5-labeled Dsi RNPs were treated to the FR-positive KB-V1 cervical cancer cells, the fraction of Cy5-positive KB-V1 cells was approximately 96% at 3 h post-treatment, whereas the Cy5-positive HepG2 lung cancer cells were rarely found (Fig. 3A). This evidence concerns the gene P4HB and lung cancer.