In vitro antitumor activity of the codelivery nanoparticles. a) WB was used to detect the effect of indicated treatments on the expression of LC3 in breast cancer cells. b) Cell viability was analyzed by CCK‐8 assay after indicated treatment in MDA‐MB‐231 cells. ***p < 0.001. c) Colony formation assays were carried out in MDA‐MB‐231 and BT549 cells. *p < 0.05, ***p < 0.001. d) EDU assays were used to detect the proliferation rate of MDA‐MB‐231 and BT549 cells after indicated treatments. Scale bar, 200 µm. ***p < 0.001. e) Scratch assay was done to show the migration ability of cells treated with different PTX preparations for 48 h. Scale bar, 200 µm. **p < 0.01, ***p < 0.001. f) Transwell migration assay showed cell migratory ability was affected by different PTX preparations. Scale bar, 200 µm. *p < 0.05, **p < 0.01, ***p < 0.001.