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Lapatinib inhibited the proliferation of NB4 cells. (A) NB4 cells were cultured with 0–20 µM lapatinib for 24 h in 96-well plate. Cytotoxicity was detected by CCK-8 assays. (B) The colony-forming ability of NB4 cells was tested with or without the treatment of lapatinib, the magnification is 40x. Data was expressed as means ± SD. *P<0.05, **P<0.01.
