CD47 and breast cancer: Mouse breast cancer cell 4T1, a CD47‐positive cell line as reported,[14] was selected as the target cell, and its cell membrane (CM) was modified with DSPE‐mPEG2000 (forming PCM) and coated on the PLGA nanoparticle core (NP) by extrusion (forming PCM@NP), then the CD47 antibodies were bound to the surface of PCM@NP by incubation (forming anti‐CD47‐PCM@NP) (Scheme1).