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Chest radiographs (a) on admission, (b) day 17, and (c) day 42 after initiating low‐dose afatinib therapy. The results showed a 40 mm‐sized lung tumor in the left upper lobe, left pleural effusion, and multiple lung metastases in both lungs (a). The lung tumor, left pleural effusion, and multiple lung metastases showed a remarkable decrease at day 17 (b) and continued to decrease 42 days after low‐dose afatinib treatment (c).
