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In vitro antitumor efficacy. (A) Cell viability of 4T1 breast cancer cells incubated with different treatments for 48 h. (B) Cell viability of 4T1 breast cancer cells incubated with different concentrations of blank PLGA nanoparticles for 24 h. Each group represents n = 6, mean ± standard deviation, ***P < 0.01, ****P < 0.001, ns: no significance.
