MMP2 and neoplasm: prepared a size‐switchable nanoplatform (DGL/DOX@PP) by combining small dendrigraft poly‐L‐lysine (DGL) with poly(ethylene glycol)–poly(caprolactone) micelles via a MMP‐2‐sensitive peptide.[85] After extravasation, the peptides in DGL/DOX@PP were cut by MMP‐2 in the tumor microenvironment and small DGL/DOX nanoparticles were rapidly released, showed an enhanced penetration in multicellular spheroids and solid tumors (Figure 9A).