Different Responses to Gefitinib in Lung Adenocarcinoma Coexpressing Mutant- and Wild-Type Epidermal Growth Factor Receptor Genes

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Response to gefitinib is strongly associated with the status of the epidermal growth factor receptor gene. Here we report the different treatment responses in a case of lung adenocarcinoma coexpressing mutant-type gene in the primary lung mass and a wild-type gene in the metastatic bone lesions. This case demonstrated that at least two strains of tumor cells were present in a single patient. This may be one of the mechanisms of gefitinib resistance.

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