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(A) Survival fraction of BT474 and BT474/LR cells after lapatinib treatment for 5 days was examined by an MTS assay. All values are presented as the mean ± S.E. (B) RTK and CIP2A expression and/or activity levels in BT474 and BT474/LR cells treated with lapatinib for 24 hours were detected by Western blotting.
