document: membrane (GE Healthcare) by the capillary method and immobilized by UV transillumination (320 nm). Northern blotting was performed according to the manufacturer’s protocols (North2South Chemiluminescent Hybridization and Detection Kit, Thermo Scientific, USA). The membrane was probed with a biotin-labelled DNA oligonucleotide (5΄- GCA CAA AGT GTG TAA CGG AAT ACC [Biotin]-3΄, high performance liquid chromatography (HPLC) purified, Mission Bio, Inc. Taiwan), which is complementary to the EGFR