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A, STAT3 shRNA or control shRNA was transfected into Tu212 and Tu686 cells. Expression levels of STAT3, Bcl-XL and Bcl2 were analyzed by Western blot. B, Tu212 and Tu686 cells expressing STAT3 shRNA or control shRNA were treated with erlotinib (1µM) for 48h. Cell growth was determined by SRB assays.
