CD44 and neoplasm: reported hyaluronic acid (HA)‐coated ZrIV‐based porphyrinic NMOFs (PZM) for enhanced PDT due to the CD44‐targeting of HA to CD44‐overexpressed tumor cells.[51] The in vivo results confirmed that more HA‐coated PZM NMOFs were distributed in CD44‐positive tumor sites compared to PZM NMOFs, and they exhibited remarkable tumor growth inhibition.