Genomic dissection of the epidermal growth factor receptor (EGFR)/PI3K pathway reveals frequent deletion of the EGFR phosphatase PTPRS in head and neck cancers Academic Article uri icon


MeSH Major

  • Carcinoma, Squamous Cell
  • Chromosome Aberrations
  • Chromosomes, Human, Pair 19
  • Head and Neck Neoplasms
  • Phosphatidylinositol 3-Kinases
  • Receptor, Epidermal Growth Factor
  • Receptor-Like Protein Tyrosine Phosphatases, Class 2
  • Signal Transduction


  • Activation of the PI3K and epidermal growth factor receptor (EGFR) pathway is able to drive oncogenesis in multiple human cancers, including head and neck squamous cell carcinoma. Targeted agents such as cetuximab and erlotinib are currently used in patients with head and neck squamous cell carcinoma, but, in this disease, the genomic alterations that cause pathway activation and determine response to pharmacologic inhibition remain ill-defined. Here, we present a detailed dissection of the EGFR/PI3K pathway, composed of sequencing of the core pathway components, and high-resolution genomic copy number assessment. Mutations were found in PIK3CA (6%), but no point mutations were observed in other pathway genes such as PTEN and EGFR. In contrast, we observed frequent copy number alterations of genes in the pathway, including PIK3CA, EGFR, protein tyrosine phosphatase receptor S (PTPRS), and RICTOR. In total, activating genetic pathway alterations were identified in 74% of head and neck tumors. Importantly, intragenic microdeletions of the EGFR phosphatase PTPRS were frequent (26%), identifying this gene as a target of 19p13 loss. PTPRS loss promoted EGFR/PI3K pathway activation, modulated resistance to EGFR inhibition, and strongly determined survival in lung cancer patients with activating EGFR mutations. These findings have important implications for our understanding of head and neck cancer tumorigenesis and for the use of targeted agents for this malignancy.

publication date

  • November 22, 2011



  • Academic Article



  • eng

PubMed Central ID

  • PMC3223475

Digital Object Identifier (DOI)

  • 10.1073/pnas.1111963108

PubMed ID

  • 22065749

Additional Document Info

start page

  • 19024

end page

  • 9


  • 108


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