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Impact of KRAS and EGFR Gene Mutations on Recurrence and Survival in Patients with Surgically Resected Lung Adenocarcinomas
Background Oncogenic gene mutations observed in lung adenocarcinomas, such as epidermal growth factor receptor ( EGFR ) and KRAS , have some predictive value for chemotherapeutic drugs or EGFR–tyrosine kinase inhibitors. However, the influence of these gene alterations on patients’ prognosis remains...
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Published in: | Annals of surgical oncology 2012-07, Vol.19 (Suppl 3), p.347-354 |
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Main Authors: | , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Background
Oncogenic gene mutations observed in lung adenocarcinomas, such as epidermal growth factor receptor (
EGFR
) and
KRAS
, have some predictive value for chemotherapeutic drugs or EGFR–tyrosine kinase inhibitors. However, the influence of these gene alterations on patients’ prognosis remains controversial.
Methods
We retrospectively analyzed the tumors of 180 patients with completely resected pathological stage I–III lung adenocarcinoma which harbored either
KRAS
codon 12 mutation or
EGFR
gene mutations within exons 18–21 to investigate the impact of these gene mutations on the patients’ survival. Gene mutations were detected by established methods.
Results
Of 180 patients, 32 had
KRAS
codon 12 mutations (KRAS group), 148 had
EGFR
mutations within exon 18–21 (EGFR group). Pathological stage and operation mode were independent factors for disease-free survival. However, the EGFR group had better overall survival than the KRAS group (
P
= 0.0271). Cox proportional hazard model revealed pathological stage (
P
= 0.0001) and presence of
EGFR
gene mutations (
P
= 0.0408) were independent factors for overall survival. In survival after tumor recurrence, the EGFR group had a better median survival time (46.7 months) after recurrence than the KRAS group (26.0 months).
Conclusions
In patients with completely resected lung adenocarcinomas,
KRAS
and
EGFR
gene mutation status of tumors was not associated with disease-free survival. However, the presence of an
EGFR
gene mutation boded well for the patient’s overall survival, and thus patients with
EGFR
mutations have a better prognosis than those with
KRAS
mutations. |
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ISSN: | 1068-9265 1534-4681 |
DOI: | 10.1245/s10434-011-1799-8 |