SIRPA and neoplasm: Interestingly, the in vivo results revealed that the treatment of SIRPα-overexpressed cell membrane-coated magnetic nanoparticles significantly inhibited the tumor growth, while single or coadministration of magnetic nanoparticles and the cell membrane showed limited antitumor effects, indicating that the enhanced tumor accumulation of the nanoparticles via magnetic navigation is largely attributed to the improved antitumor effects.