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  • Title: Somatic mutations in epidermal growth factor receptor signaling pathway genes in non-small cell lung cancers.
    Author: Lee SY, Kim MJ, Jin G, Yoo SS, Park JY, Choi JE, Jeon HS, Cho S, Lee EB, Cha SI, Park TI, Kim CH, Jung TH, Park JY.
    Journal: J Thorac Oncol; 2010 Nov; 5(11):1734-40. PubMed ID: 20881644.
    Abstract:
    INTRODUCTION: Epidermal growth factor receptor (EGFR) signaling pathway plays a crucial role in the development and progression of lung cancer. We searched for mutations of EGFR pathway genes in non-small cell lung cancers (NSCLCs) and analyzed their relationship with clinicopathologic features. METHODS: Mutations of EGFR, ERBB2, ERBB3, ERBB4, KRAS, NRAS, BRAF, PTEN, PIK3CA, LKB1, and AKT1 genes were determined by direct sequencing in 173 surgically resected NSCLCs--56 squamous cell carcinomas (SCCs) and 117 adenocarcinomas (ACs). RESULTS: Of the 173 NSCLCs, a total of 65 mutations were detected in 63 (36.4%) tumors--10 (17.9%) in SCCs and 53 (45.3%) in ACs. Mutations in EGFR pathway genes were significantly more frequent in women and ACs than in women and SCCs (p = 0.02 and p < 0.001, respectively). The mutations occurred in a mutually exclusive pattern. When the genes were divided into three subgroups according to their roles in the signaling cascade, mutations in the EGFR/ERBB2 and KRAS/BRAF genes were more frequent in ACs than in SCCs (p < 0.001 and p = 0.01, respectively). In marked contrast, mutations in the PIK3CA/PTEN were more frequent in SCCs than in ACs (p = 0.002). Furthermore, mutations in the PIK3CA/PTEN genes were more frequent in smokers (p = 0.04). DISCUSSION: Our study demonstrates that mutations in each part of the EGFR pathway were associated with different clinicopathologic features in patients with NSCLCs.
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