Abstract 1548: Genomic and molecular profiling of NSCLC formalin-fixed paraffin-embedded tumors

Abstract

Abstract Non-Small Cell Lung Cancer (NSCLC) is the most common form of lung cancer, accounting for approximately 85% of all lung cancers worldwide. Standard therapy options include surgical resection followed by radiation and/or chemotherapy. More recently, analysis of the genomic profile of NSCLC has led to the development of molecularly targeted treatment strategies designed to enhance survival of select subsets of patients containing pre-determined genetic alterations, including gene mutations and aberrant gene expression profiles. In this study, we have developed a TaqMan-based approach to evaluate the genomic profile of 339 NSCLC FFPE tumors, consisting of 152 adenocarcinoma and 187 squamous cell carcinoma (SCC), stages I-IV. Using a custom qRT-PCR somatic mutation array, we have identified the frequencies of key mutations prevalent in NSCLC- associated genes, including EGFR: 5% SCC , 29% adenocarcinoma, cMET: 6% SCC, 4% adenocarcinoma, and KRAS: 3% SCC, 19% adenocarcinoma. Overall, these frequencies are concordant with previous reports. Additionally, we have evaluated the gene expression and IHC profiles of NSCLC-driver signaling pathways including EGFR, cMET and HGF. Various levels of expression for EGFR, cMET and HGF were observed across all samples, with a significant association detected between the presence of EGFR mutation and high EGFR expression in adenocarcinoma (p value = 0.0046). Overall, our findings represent a comprehensive catalog of common genetic aberrations with concurrent gene and protein expression profiles in NSCLC. Furthermore, this data provides insight into correlations observed across these molecular characteristics contributing to NSCLC tumor development. These insights can provide guidance for patient stratification and novel therapeutic strategies for select targeted therapies in NSCLC. Citation Format: Dana S. Gaffney, Katherine Bell, Gabriela Martinez, Yashoda Rajpurohit, Jayaprakash Karkera, Christopher Moy, Suso Platero. Genomic and molecular profiling of NSCLC formalin-fixed paraffin-embedded tumors. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 1548. doi:10.1158/1538-7445.AM2014-1548