[Two cases of recurrent non-small cell lung cancer successfully treated with S-1 as fifth-line chemotherapy].

There is at present no defined role for S-1 chemotherapy in patients with advanced non-small cell lung cancer (NSCLC) who previously failed chemotherapy. Two cases of multidrug-resistant, NSCLC that were successfully treated with S-1 as fifth-line chemotherapy are reported. A 75-year-old man was diagnosed as having pulmonary adenocarcinoma, cT1N3M0, stage III B.