PLGA-PEG-MAL (20kDA-5.0kDA, LA:GA ratio 40:60) is a kind of poly(lactide-co-glycolide)-block-poly(ethylene glycol) (PLGA-PEG-Mal) nanoparticles. PLGA-PEG-MAL (20kDA-5.0kDA, LA:GA ratio 40:60) has a molecular weight of 60kDA to 3.4kDA and contains a 75:25 ratio of lactic acid (LA) to glycolic acid (GA) molecules.