Table of Contents
ISRN Pulmonology
Volume 2013 (2013), Article ID 409862, 6 pages
http://dx.doi.org/10.1155/2013/409862
Clinical Study

Lung Cancer Diagnosed More Than Five Years after the Development of Polymyositis/Dermatomyositis

Department of Pulmonary Medicine, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan

Received 29 March 2013; Accepted 8 May 2013

Academic Editors: C. Flores and A. S. Melani

Copyright © 2013 Ken Uchibori et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Background. The patients with polymyositis (PM) and dermatomyositis (DM) often develop the malignancies in their clinical course. The incidence of cancer is estimated at about 15%. The risk of cancer is the highest within the first year of myositis diagnosis and drops substantially thereafter. The patients with lung cancer diagnosed more than 5 years after the onset of PM or DM are the minority. Methods and Patients. We surveyed the medical records of patients with lung cancer over the period from 1995 to 2011. Results. We found five patients who developed lung cancer more than 5 years after the diagnosis of PM/DM. Three patients were male, and two were female. The median age was 61.2 (±11.7). Histological types were diverse. The clinical stages ranged from IA to IV. Three patients had smoking histories. Four patients suffered from DM, and one suffered from PM. All patients received oral corticosteroid therapy. Two patients also received ciclosporin, and another two received azathioprine. Anti-Jo-1 antibody was positive in one patient. Four patients were complicated with interstitial pneumonia (IP). Conclusion. These lung cancers diagnosed more than 5 years after the onset of PM/DM were probably related to IP or smoking but might not be comorbid with PM/DM.