CSF1 and neoplasm: developed tumor‐associated macrophage membrane (TAMM)‐coated photosensitizer‐conjugated upconversion nanoparticles (NPR@TAMM) to block CSF‐1‐CSF‐1R axis for TAMs‐repolarization.[103] The resultant nanoparticles could specifically deplete CSF‐1 levels in the serum and distant tumor cells, because the primary tumor‐derived TAMs can directly bind with CSF‐1 by mimicking CSF‐1‐CSF‐1R interactions between macrophages and tumor cells.