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Chest X-ray findings. (A) A giant mass shadow was observed in the left upper lung field at the initial visit. (B) The pulmonary metastatic colonies in the right lung were obviously enlarged when second-line chemotherapy was introduced. F1CDx was performed at this time. (C) The lung metastatic colonies were further enlarged when osimertinib was introduced. (D) A marked anti-tumor response was observed after two months of osimertinib treatment.
