PGP and leukemia: For instance, the Dox‐loaded, P‐gp antibodies (anti‐Pgp) functionalized SWNTs (Ap‐SWNTs) demonstrate high drug loading efficacy and NIR controlled drug release.116 The Ap‐SWNTs were specifically sensitive to MDR human leukemia cells (K562R) with 2.4‐fold higher cytotoxicity and caused significant cell death when against K562R with near‐infrared radiation compared to free Dox, because the P‐gp antibody functionalized SWNTs could effectively interact with P‐gp, which were ubiquitously overexpressed on the membrane surface of MDR cells.