diagnosis of adult-onset Rheumatoid Arthritis (RA) for a duration of at least 6 months but not longer than 5 years

positive Rheumatoid Factor (RF) and/or positive anti Cyclic Citrullinated Peptide (anti-CCP)

active RA disease

subjects must have failed at least one traditional Disease Modifying Anti-Rheumatic Drug (DMARD).

subject is naïve to RA related biologics

Open Label Study to Assess the Predictability of Early Response to Certolizumab Pegol in Patients With Rheumatoid Arthritis