Overview Open Label Extension for Patients Coming From the Dosing Flexibility Study in Patients With Rheumatoid Arthritis (RA) Status: Completed Trial end date: 2011-05-01 Target enrollment: Participant gender: Summary The purpose of this study is to continue to assess the safety of certolizumab pegol in combination with methotrexate (MTX). Phase: Phase 3 Details Lead Sponsor: UCB PharmaTreatments: Certolizumab Pegol