title: [Relationship between Mutations of the Epidermal Growth Factor Receptor Gene and Drug-Resistance to Gefitinib in Human Lung Cancer in vitro.].
abstract: BACKGROUND
  To explore cell lines' difference of drug-resistance to gefitinib and the underlying mechanism.
  
  
  METHODS
  Human lung cancer cell lines of PC9, PC9/AB2, PC9/AB11, PC9/BB4 were treated in vitro, exons 18-21 of EGFR gene were sequenced and EGFR gene mRNA levels were measured.
  
  
  RESULTS
  Four cell lines' drug resistance difference of gefitinib were validated. All the four cell lines had the 15 bp deletion at exon 19, and AB11 had A to G point-mutation at exon 20. PC9 EGFR gene in the sensitive cell line was expressed much higher than that in 3 resistance cell lines by real-time PCR.
  
  
  CONCLUSIONS
  There is significant difference of drug-resistance to gefitinib existed among the lung cancer cell lines PC9, PC9/AB2, PC9/AB11 and PC9/BB4. The mutations changes of expressive level of EGFR gene might be correlated with the acquired drug-resistance to gefitinib in lung cancer cell lines.
authors: Tianjin Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin 300052, China.
authors: Wei
authors: W
authors: Wei
authors: Yu
authors: Y
authors: Fan
authors: Hongyu
authors: H
authors: Liu
authors: Zhihao
authors: Z
authors: Wu
authors: Haisu
authors: H
authors: Wan
authors: Zhiqin
authors: Z
authors: Yan
authors: Ke
authors: K
authors: Xu
authors: Qinghua
authors: Q
authors: Zhou