BACKGROUND: Survival benefit of non-small-cell lung cancer (NSCLC) patients treated with epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors is predicted by high EGFR gene copy number and by strong EGFR protein expression. Clinical relevance of these features in patients treated with chemotherapy has not been reported. PATIENTS AND METHODS: This study included 82 NSCLC patients treated with chemotherapy. There were 45% of females, 6% of never smokers and 45% of patients diagnosed with adenocarcinoma. EGFR gene copy number was evaluated by fluorescence in situ hybridization and EGFR protein level by immunohistochemistry. RESULTS: High EGFR gene copy number and protein level were found in 33% and 71% of patients, respectively. Both markers were significantly associated (P = 0.01). For objective response and disease control, there was no difference between patients defined as negative or positive for both EGFR gene copy number (P = 0.39 and P = 1.00, respectively) and for EGFR protein (P = 1.00 and P = 0.80, respectively). There were no differences in progression-free and overall survival according to EGFR gene copy number (P = 0.76 and P = 0.82, respectively) and protein level (P = 0.67 and P = 0.62, respectively). CONCLUSION: In chemotherapy-treated NSCLC patients, EGFR gene copy number was positively associated with protein level but none of the features were predictive for either treatment response or survival.
BACKGROUND: Survival benefit of non-small-cell lung cancer (NSCLC) patients treated with epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors is predicted by high EGFR gene copy number and by strong EGFR protein expression. Clinical relevance of these features in patients treated with chemotherapy has not been reported. PATIENTS AND METHODS: This study included 82 NSCLCpatients treated with chemotherapy. There were 45% of females, 6% of never smokers and 45% of patients diagnosed with adenocarcinoma. EGFR gene copy number was evaluated by fluorescence in situ hybridization and EGFR protein level by immunohistochemistry. RESULTS: High EGFR gene copy number and protein level were found in 33% and 71% of patients, respectively. Both markers were significantly associated (P = 0.01). For objective response and disease control, there was no difference between patients defined as negative or positive for both EGFR gene copy number (P = 0.39 and P = 1.00, respectively) and for EGFR protein (P = 1.00 and P = 0.80, respectively). There were no differences in progression-free and overall survival according to EGFR gene copy number (P = 0.76 and P = 0.82, respectively) and protein level (P = 0.67 and P = 0.62, respectively). CONCLUSION: In chemotherapy-treated NSCLCpatients, EGFR gene copy number was positively associated with protein level but none of the features were predictive for either treatment response or survival.
Authors: Ming-Sound Tsao; Akira Sakurada; Keyue Ding; Sarit Aviel-Ronen; Olga Ludkovski; Ni Liu; Aurélie Le Maître; David Gandara; David H Johnson; James R Rigas; Lesley Seymour; Frances A Shepherd Journal: J Thorac Oncol Date: 2011-01 Impact factor: 15.609
Authors: Sarah Wheeler; Doris R Siwak; Raymond Chai; Courtney LaValle; Raja R Seethala; Lin Wang; Kathleen Cieply; Carol Sherer; Corwin Joy; Gordon B Mills; Athanassios Argiris; Jill M Siegfried; Jennifer R Grandis; Ann Marie Egloff Journal: Clin Cancer Res Date: 2012-02-20 Impact factor: 12.531
Authors: Alison L Van Dyke; Michele L Cote; Geoffrey M Prysak; Gina B Claeys; Angie S Wenzlaff; Valerie C Murphy; Fulvio Lonardo; Ann G Schwartz Journal: Carcinogenesis Date: 2008-05-02 Impact factor: 4.944
Authors: Fred R Hirsch; Marileila Varella-Garcia; Rafal Dziadziuszko; Yun Xiao; Sujatha Gajapathy; Margaret Skokan; Ming Lin; Vincent O'Neill; Paul A Bunn Journal: Clin Cancer Res Date: 2008-10-01 Impact factor: 12.531