Use of cigarette-smoking history to estimate the likelihood of mutations in epidermal growth factor receptor gene exons 19 and 21 in lung adenocarcinomas

Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology
DuyKhanh PhamValerie W Rusch

Abstract

Lung adenocarcinomas with mutations in exons 19 and 21 of the epidermal growth factor receptor gene (EGFR) demonstrate sensitivity to gefitinib or erlotinib. Investigators have reported an association between EGFR mutations and the amount and duration of cigarette smoking, with the highest incidence of mutations seen in never smokers. EGFR exon 19 and 21 mutation status was determined in 265 tumor samples using direct sequencing, polymerase chain reaction (PCR), or PCR-based restriction fragment length polymorphism analysis. A detailed smoking history was obtained. Patients were categorized as never smokers (< 100 lifetime cigarettes), former smokers (quit > or = 1 year ago), or current smokers (quit < 1 year ago). We detected EGFR mutations in 34 (51%) of 67 never smokers (95% CI, 38% to 64%), 29 (19%) of 151 former smokers (95% CI, 13% to 27%), and two (4%) of 47 current smokers (95% CI, 1% to 16%). Significantly fewer EGFR mutations were found in people who smoked for more than 15 pack-years (P < .001) or stopped smoking less than 25 years ago (P < .02) compared with individuals who never smoked. The number of smoking pack-years and smoke-free years predicted the prevalence of EGFR mutations (areas under receiver operating c...Continue Reading

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