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Published on: September 20, 2016
MEK1 gene mutation in Japanese lung adenocarcinoma patients
Hidefumi Sasaki1, Yu Hikosaka, Katsuhiro Okuda
1Department of Surgery II, Nagoya City University Medical School, Nagoya 467-8601, Japan. hisasaki @med.nagoya-cu.ac.jp.
Abstract:
Recently, to identify potential somatic mutations in genes of the epidermal growth factor receptor (EGFR) signaling pathway, the MEK1 gene mutation at exon 2 was identified. The mutant form of MEK1 leads to the constitutive activity of extracellular signal-regulated kinase (ERK)-1/2. We investigated MEK1 gene mutation status in 241 surgically treated lung adenocarcinoma cases from Nagoya City University Hospital. The presence or absence of the MEK1 mutation was analyzed by direct sequencing. EGFR mutation status was previously investigated and reported. We detected only one case (0.4%) of the MEK1 mutation (K57N) in our cohort. Total EGFR mutations were present in 101 patients (41.9%). The MEK1 mutation was mutually exclusive with B-raf, K-ras and EGFR mutations. Thus, it is a rare mutation in Japanese lung cancer patients, and of limited value for lung adenocarcinoma.
Insights
A study found MEK1 gene mutations are rare in Japanese lung adenocarcinoma patients, occurring in only 0.4% of cases. These MEK1 mutations were mutually exclusive with common mutations like EGFR, suggesting limited clinical utility.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Somatic mutations in the epidermal growth factor receptor (EGFR) signaling pathway are crucial in lung adenocarcinoma.
- MEK1 gene mutations, particularly at exon 2, can lead to constitutive activation of extracellular signal-regulated kinase (ERK)-1/2.
- Investigating MEK1 mutation status is important for understanding lung cancer pathogenesis and identifying potential therapeutic targets.
Purpose of the Study:
- To investigate the frequency and clinical significance of MEK1 gene mutations in a cohort of Japanese lung adenocarcinoma patients.
- To determine if MEK1 mutations are associated with other common mutations in the EGFR signaling pathway, such as EGFR, B-raf, and K-ras.
Main Methods:
- Direct sequencing was used to analyze the presence or absence of MEK1 mutations in exon 2.
- A cohort of 241 surgically treated lung adenocarcinoma cases was studied.
- EGFR mutation status was previously determined for the cohort.
Main Results:
- Only one case (0.4%) of MEK1 mutation (K57N) was detected in the cohort.
- EGFR mutations were present in 41.9% of the patients.
- MEK1 mutations were found to be mutually exclusive with B-raf, K-ras, and EGFR mutations.
Conclusions:
- MEK1 mutations are rare in Japanese lung adenocarcinoma patients.
- The mutual exclusivity of MEK1 mutations with other common driver mutations suggests a distinct role in a small subset of lung adenocarcinomas.
- MEK1 mutations appear to have limited clinical value as a predictive biomarker in this population.
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