Gefitinib is an oral selective inhibitor of the epidermal growth factor receptor (EGFR) tyrosine kinase, and is regarded as a safe agent, although some toxic effects such as interstitial pneumonia exist [1,2]. Gefitinib is now being attempted for patients with advanced non-small cell lung cancer (NSCLC). We herein report a lung adenocarcinoma patient who obtained regression of bone metastasis by gefitinib therapy.A 63-year-old woman with no smoking history was admitted because of a nodular lesion that was detected incidentally by a chest radiograph. She complained back pain, and a painkilling drug was administrated. Chest CT scan demonstrated a 3.5 9 2.5 cm left lung mass with multiple intrapulmonary metastases. A magnetic resonance imaging (MRI) revealed hypointense on a T1-weighted and hyperintense on a T2-weighted image of the vertebral bodies of the seventh thoracic (T7) and the third cervical spine (C3). Similar image was observed in the left transverse process of the second lumbar spine (L2). MRI also showed the compression fracture of the vertebral body of T7. Pathology samples obtained by transbronchial biopsy confirmed adenocarcinoma of the lung. Bone scan showed marked accumulation in these vertebral bones (C3, T7, and L2) (Fig. 1a). She had one course of chemotherapy combined with carboplatin and paclitaxel, but the response was evaluated as progressive disease. Thereafter, she received 250 mg gefitinib one daily, but she had no concurrent medications including biphsophonates. Pretreatment evaluation of the epidermal growth factor receptor mutation in her adenocarcinoma was not performed because of her refusal. Chest CT scan on day 28 revealed regression of intrapulmonary metastases. Two months after the start of gefitinib, back pain decreased and the use of the painkilling drug was stopped. Except for elevation of transaminase up to 60 U/ml, adverse effects considered to be possibly due to gefitinib administration including interstitial pneumonia, skin rash, and diarrhea were not observed. She received gefitinib every other day, and the liver injury was normalized. Eight months after the beginning of gefitinib, bone scan showed regression of bone metastasis (Fig. 1b). MRI also revealed regression of bone metastasis in C3, T7, and L2. Patient is currently active and able to perform her activity of daily living independently. The patient remained alive and with no evidence of bone metastasis for 2 years.We administrated gefitinib to a patient with vertebral bone metastasis due to lung adenocarcinoma. Although the patient also had multiple intrapulmonary metastases, a remarkable antitumor activity was obtained without any serious adverse effects. Both female gender and adenocarcinoma are identified as favorable prognostic factors in a multivariate analysis of patients in previous randomized double blind trials [1, 2]. Our patient was a woman diagnosed with adenocarcinoma of the lung, and as such, might have two advantages of gender and histology. Long-term survivors with bone metastasis have rarely been ...