MMP2 and lung carcinoma: As shown in Figure 1, for the first time, we designed a cationic peptide with a mirrored RGD modification, featuring four arginine residues at both ends of the MMP2‐cleavable peptide PLGLAG (RGDGSRRRRPLGLAGRRRRGSRGD, RD24), which was used to carry the lung cancer suppressive miRNA, miR‐148a‐3p.