Originally published as JCO Early Release 10.1200/JCO.2005.02.857 on July 25 2005
Journal of Clinical Oncology, Vol 23, No 25 (September 1), 2005: pp. 5900-5909
© 2005 American Society of Clinical Oncology.
Mutations in the Epidermal Growth Factor Receptor and in KRAS Are Predictive and Prognostic Indicators in Patients With NonSmall-Cell Lung Cancer Treated With Chemotherapy Alone and in Combination With Erlotinib
David A. Eberhard,
Bruce E. Johnson,
Lukas C. Amler,
Audrey D. Goddard,
Sherry L. Heldens,
Roy S. Herbst,
William L. Ince,
Pasi A. Jänne,
Thomas Januario,
David H. Johnson,
Pam Klein,
Vincent A. Miller,
Michael A. Ostland,
David A. Ramies,
Dragan Sebisanovic,
Jeremy A. Stinson,
Yu R. Zhang,
Somasekar Seshagiri,
Kenneth J. Hillan
From the Departments of Pathology, Molecular Diagnostics, Molecular Biology, Biostatistics and BioOncology, Genentech Inc, San Francisco, CA; Department of Medical Oncology, Dana-Farber Cancer Institute, and Departments of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA; The University of Texas M.D. Anderson Cancer Center, Houston, TX; Vanderbilt Medical Center, Nashville, TN; and Thoracic Oncology Service, Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, NY
Address reprint requests to Kenneth J. Hillan, MD, Genentech Inc, 1 DNA Way, San Francisco, CA 94080: e-mail: kjh{at}gene.com
PURPOSE: Epidermal growth factor receptor (EGFR) mutations have been associated with tumor response to treatment with single-agent EGFR inhibitors in patients with relapsed nonsmall-cell lung cancer (NSCLC). The implications of EGFR mutations in patients treated with EGFR inhibitors plus first-line chemotherapy are unknown. KRAS is frequently activated in NSCLC. The relationship of KRAS mutations to outcome after EGFR inhibitor treatment has not been described.
PATIENTS AND METHODS: Previously untreated patients with advanced NSCLC in the phase III TRIBUTE study who were randomly assigned to carboplatin and paclitaxel with erlotinib or placebo were assessed for survival, response, and time to progression (TTP). EGFR exons 18 through 21 and KRAS exon 2 were sequenced in tumors from 274 patients. Outcomes were correlated with EGFR and KRAS mutations in retrospective subset analyses.
RESULTS: EGFR mutations were detected in 13% of tumors and were associated with longer survival, irrespective of treatment (P < .001). Among erlotinib-treated patients, EGFR mutations were associated with improved response rate (P < .05) and there was a trend toward an erlotinib benefit on TTP (P = .092), but not improved survival (P = .96). KRAS mutations (21% of tumors) were associated with significantly decreased TTP and survival in erlotinib plus chemotherapytreated patients.
CONCLUSION: EGFR mutations may be a positive prognostic factor for survival in advanced NSCLC patients treated with chemotherapy with or without erlotinib, and may predict greater likelihood of response. Patients with KRAS-mutant NSCLC showed poorer clinical outcomes when treated with erlotinib and chemotherapy. Further studies are needed to confirm the findings of this retrospective subset analysis.
This work was supported by Genentech Inc.
Presented in an oral presentation by P. Jänne at the 40th Annual Meeting of the American Society of Clinical Oncology, New Orleans, LA, June 7, 2004; and in a poster presentation at European Organization for Research and Treatment of Cancer National Cancer InstituteAmerican Association for Cancer Research Conference on "Molecular Targets and Cancer Therapeutics," Geneva, Switzerland, September 30, 2004.
Drs Eberhard and Johnson contributed equally to the article.
Authors' disclosures of potential conflicts of interest are found at the end of this article.
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[Full Text]
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R. Dziadziuszko, F. R. Hirsch, M. Varella-Garcia, and P. A. Bunn Jr.
Selecting Lung Cancer Patients for Treatment with Epidermal Growth Factor Receptor Tyrosine Kinase Inhibitors by Immunohistochemistry and Fluorescence In situ Hybridization--Why, When, and How?
Clin. Cancer Res.,
July 15, 2006;
12(14):
4409s - 4415s.
[Abstract]
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