Functional genomic analysis identified epidermal growth factor receptor activation as the most common genetic event in oral squamous cell carcinoma

Jim Jinn Chyuan Sheu, Chun Hung Hua, Lei Wan, Ying Ju Lin, Ming Tsung Lai, Hsien Chang Tseng, Natini Jinawath, Ming Hsui Tsai, Nai Wen Chang, Chin Fen Lin, Chyi Chyang Lin, Lie Jiau Hsieh, Tian-Li Wang, Ie Ming Shih, Fuu Jen Tsai

Research output: Contribution to journalArticle

Abstract

A 250K single-nucleotide polymorphism array was used to study subchromosomal alterations in oral squamous cell carcinoma (OSCC). The most frequent amplification was found at 7pll.2 in 9 of 29 (31%) oral cancer patients. Minimal genomic mapping verified a unique amplicon spanning from 54.6 to 55.3 Mb on chromosome 7, which contains SEC61G and epidermal growth factor receptor (EGFR). Kesults from fluorescence in situ hybridization, transcriptome, and immunohistochemistry analyses indicated that the expression level of EGFR, but not of SEC61G, was up-regulated and tightly correlated with DMA copy number in 7pll.2 amplified tumors. Among the members of the erbB family, EGFR (HER1) was found to be the most frequently amplified and highly expressed gene in both human and mouse oral tumors (P <0.01). Genes for downstream effectors of EGFR, including KRAS, mitogen-activated protein kinase 1, and CCND1, were also found amplified or mutated, which resulted in activation of EGFR signaling in 55% of OSCC patients. Head and neck squamous cancer cells with different EGER expression levels showed differential sensitivity to antitumor effects of AG1478, a potent EGFR inhibitor. AG1478-induced EGFR inactivation significantly suppressed tumor development and progression in a mouse oral cancer model. Our data suggest that EGFR signaling is important in oral cancer development and that anti-EGFR therapy would benefit patients who carry the 7p 11.2 amplicon in their tumors.

Original languageEnglish (US)
Pages (from-to)2568-2576
Number of pages9
JournalCancer Research
Volume69
Issue number6
DOIs
StatePublished - Mar 15 2009

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ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Cite this

Sheu, J. J. C., Hua, C. H., Wan, L., Lin, Y. J., Lai, M. T., Tseng, H. C., Jinawath, N., Tsai, M. H., Chang, N. W., Lin, C. F., Lin, C. C., Hsieh, L. J., Wang, T-L., Shih, I. M., & Tsai, F. J. (2009). Functional genomic analysis identified epidermal growth factor receptor activation as the most common genetic event in oral squamous cell carcinoma. Cancer Research, 69(6), 2568-2576. https://doi.org/10.1158/0008-5472.CAN-08-3199