The CE48T/VGH cells, lapatinib-resistant sub-cells and Het-1A cells were plated on 96-well plates (8000 cells/well) and treated with the indicated amounts of AXL inhibitor, foretinib [37 (link)] (GSK1363089, provided by Santa Cruz Biotechnology, Inc. SC-364492) or HER2 inhibitors. The HER2 inhibitors included lapatinib, afatinib [38 (link)] (Tovok, provided by Boehringer Ingelheim, Taiwan), and AC480 [39 (link)] (BMS599626, synthesized by Selleckchem, S1056). After incubation for 72 hours, cell survival was determined by MTT assay as described previously [40 (link)–41 (link)].
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