Journal
CLINICAL CANCER RESEARCH
Volume 11, Issue 16, Pages 5878-5885Publisher
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/1078-0432.CCR-04-2618
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- NCI NIH HHS [R01 CA093708-01A3, R01 CA093708] Funding Source: Medline
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Purpose: Activating Mutations in the tyrosine kinase domain of the epidermal growth factor receptor (EGFR) confer a strong sensitivity to gefitinib, a selective tyrosine kinase inhibitor of EGFR. Experimental Design: We examined EGFR mutations at exons 18,19, and 21 in tumor tissue from 68 gefitinib-treated, chemorefractory, advanced non-small cell lung cancer patients from the United States, Europe, and Asia and in a highly gefitinib-sensitive non-small cell lung cancer cell line and correlated their presence with response and survival. In addition, in a subgroup of 28 patients for whom the remaining tumor tissue was available, we examined the relationship among EGFR mutations, CA repeats in intron 1 of EGFR, EGFR and caveolin-1 mRNA levels, and increased EGFR gene copy numbers. Results: Seventeen patients had EGFR mutations, all of which were in lung adenocarcinomas. Radiographic response was observed in 16 of 17 (94.1%) patients harboring EGFR mutations, in contrast with 6 of 51 (12.6%) with wild-type EGFR (P<0.0001). Probability of response increased significantly in never smokers, patients receiving a greater number of prior chemotherapy regimens, Asians, and younger patients. Median survival was not reached for patients with EGFR mutations and was 9.9 months for those with wild-type EGFR (P=0.001). EGFR mutations tended to be associated with increased numbers of CA repeats and increased EGFR gene copy numbers but not I with EGFR and caveolin-1 m RNA overexpression (P=not significant). Conclusions: The presence of EGFR mutations is a major determinant of gefitinib response, and targeting EGFR should be considered in preference to chemotherapy as first-line treatment in lung adenocarcinomas that have demonstrable EGFR mutations.
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