RT Journal Article SR Electronic T1 Sarcoidosis complicating treatment with natalizumab for Crohn's disease JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 1109 OP 1110 DO 10.1136/thx.2010.155762 VO 66 IS 12 A1 Parisinos, C A A1 Lees, C W A1 Wallace, W A H A1 Satsangi, J YR 2011 UL http://thorax.bmj.com/content/66/12/1109.abstract AB Natalizumab is a humanised monoclonal antibody targeting the lymphocyte adhesion molecule a4 integrin, with proven efficacy in multiple sclerosis (MS) and Crohn's disease (CD). The development of sarcoidosis with extrapulmonary involvement is reported in two patients with refractory CD who had received maintenance therapy with natalizumab. This complication has not been previously reported. It is hypothesised that the effect of natalizumab in altering lymphocyte mucosal trafficking may underlie the development of sarcoidosis in these patients.