Excerpt from the erlotinib drug label:
"Erlotinib inhibits the intracellular phosphorylation of tyrosine kinase associated with the epidermal growth factor receptor (EGFR). Specificity of inhibition with regard to other tyrosine kinase receptors has not been fully characterized. EGFR is expressed on the cell surface of normal cells and cancer cells."
(For the complete drug label text with sections containing pharmacogenetic information highlighted, see the Erlotinib drug label PDF.)
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