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Real time PCR of primary lung adenocarcinoma and pleural squamous cell carcinoma. (A) Real time PCR of the lung tumor represents the activating EGFR mutation (exon 21 L858R point mutation); (B) real time PCR of the pleural recurrence site represents the activating EGFR mutation (exon 21 L858R point mutation). EGFR, epidermal growth factor receptor; PCR, polymerase chain reaction.
