title: Evidence for disease control with erlotinib after gefitinib failure in typical gefitinib-sensitive Asian patients with non-small cell lung cancer.
abstract: BACKGROUND
  The epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKIs) gefitinib and erlotinib are gaining an increasing role in the management of advanced non-small cell lung cancer (NSCLC). There is mounting interest in the benefit of administering a second TKI after failure of the first TKI, especially in Asian patients, in whom they are expected to be more efficacious.
  
  
  METHODS
  We did a retrospective analysis of patients receiving both gefitinib and erlotinib in our institution during a 2-year period. Patients were to have received the second TKI after progressive disease on the first TKI. EGFR gene mutation analysis was done on patient tumor samples.
  
  
  RESULTS
  Fourteen patients were included in the analysis, all of whom received erlotinib after progression on gefitinib. Chinese race, females, never-smokers, and adenocarcinoma subtype were predominant in their respective categories. Disease control rate was 64.3% (9 of 14) for gefitinib. Disease control rate for erlotinib administered after progression on gefitinib was 35.7% (5 of 14). All patients who achieved disease control with erlotinib after progression on gefitinib were never-smokers with adenocarcinoma subtype, who had prior disease control on gefitinib. Presence of EGFR mutations predicted for disease control with gefitinib, and for disease control with erlotinib after gefitinib failure.
  
  
  CONCLUSIONS
  A significant proportion of typical gefitinib-sensitive Asian NSCLC patients can have disease control with erlotinib after gefitinib failure. The role of subsequent administration of a second EGFR TKI after failure of the first TKI in advanced NSCLC should be further pursued.
authors: Department of Haematology-Oncology, National University Hospital, Singapore. Alvin_SC_WONG@nuh.com.sg
authors: Alvin S
authors: AS
authors: Wong
authors: Richie
authors: R
authors: Soong
authors: Serena Bee-Kee
authors: SB
authors: Seah
authors: Siew-Woon
authors: SW
authors: Lim
authors: Khoon-Leong
authors: KL
authors: Chuah
authors: Min-En
authors: ME
authors: Nga
authors: Tan-Min
authors: TM
authors: Chin
authors: Ross A
authors: RA
authors: Soo
mesh_terms: D000328:Adult; D000368:Aged; D002289:Carcinoma, Non-Small-Cell Lung / Q000188:drug therapy* / Q000401:mortality / Q000556:secondary; D018450:Disease Progression; D066246:ErbB Receptors / Q000037:antagonists & inhibitors / Q000235:genetics; D000069347:Erlotinib Hydrochloride; D005260:Female; D000077156:Gefitinib; D006801:Humans; D008175:Lung Neoplasms / Q000188:drug therapy* / Q000401:mortality / Q000473:pathology; D008207:Lymphatic Metastasis / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009154:Mutation / Q000235:genetics; D047428:Protein Kinase Inhibitors / Q000627:therapeutic use*; D011799:Quinazolines / Q000627:therapeutic use*; D012189:Retrospective Studies; D015996:Survival Rate
chemical_list: D047428:Protein Kinase Inhibitors; D011799:Quinazolines; D000069347:Erlotinib Hydrochloride; D066246:ErbB Receptors; D000077156:Gefitinib