RNPEP and neoplasm: The number of tumor nodules on organ surface (Figure 6F) further demonstrated that the MiV-Dox significantly suppressed tumor metastasis (3.8 ± 2.2 nodules/mouse) compared with ApB-Dox (14.7 ± 5.9 nodules/mouse) and Exo-Dox (17.5 ± 6.9 nodules/mouse).