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Case 2. Serial contrast-enhanced CT scans of the chest. (a) one month after gefitinib therapy; (b) CT scan showing a new lesion at the right lund after 29 months of gefitinib therapy; (c) CT showing a stable disease of the lung nodule after two cycles of chemotherapy; (d) CT scan showing a marked regression of the tumor in the right lung, and stable disease of the tumor in the left lung after one month of gefitinib re-challenge.
