Objective: To prepare combretastatin A-4P(CA4P) sustained release nanoparticles with polylactic acid-polyglycolic acid(PLGA) as carrier material

and investigate its in vitro and in vivo anti-tumor activity. Method: CA4P-PLGA-NPs were made by W/O/W double emulsion solvent evaporation method

morphology of CA4P-PLGA-NPs was observed by transmission electron microscopy

particle size distribution was measured by dynamic laser scattering instrument

drug loading

encapsulation efficiency and in vitro cumulative release rate were determined by HPLC.In vitro cytotoxic activity of CA4P-PLGA-NPs on Hela cell was measured by MTT assay

in vivo antitumor activity was evaluated by tumor-bearing nude mice test. Result: Particle size distribution of CA4P-PLGA-NPs was narrow with average particle size was 113.7 nm

average drug loading was (12.5±0.8)%

average encapsulation efficiency was (58.9±1.2)%

these data showed that CA4P-PLGA-NPs had a certain sustained-release effect.CA4P-PLGA-NPs had good in vitro and in vivo anti-tumor activity through MTT and tumor-bearing nude mice test. Conclusion: CA4P-PLGA-NPs prepared by W/O/W solvent evaporation method had sustained-release effect

its anti-tumor activity was better than CA4P.