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Seventy to 40% of K‐RAS wild type colorectal tumors does not seem to benefit from treatment with antiepidermal growth factor receptor (anti‐EGFR) monoclonal antibodies. Recent data suggested that in presence of IGF‐1 system, altered activation colorectal cancer cells may escape anti‐EGFR mediated cell death. The interaction between IGF‐1 expression and K‐RAS mutational analysis was tested to verify...
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