CXCR4 and neoplasm: Immunofluorescence analysis showed that compared to the oe‐NC group, the fluorescence intensity of CXCR4 and CXCL12 in the tumor tissues of the oe‐NC+M2pep‐Cs NPs/Plerixafor group remained unchanged; while, CXCR4 fluorescence intensity was significantly increased in the tumor tissues of the oe‐CXCR4 group, with no change in CXCL12 fluorescence intensity.