Open Label Extension for Patients Coming From the Dosing Flexibility Study in Patients With Rheumatoid Arthritis (RA)

Patients having completed the week 34 assessment in the C87077 (NCT00580840) study or having
met the pre-defined criteria for flare (defined as patients that have randomized at Week 18
and experienced at 2 consecutive visits between Week 18 and Week 34 inclusive an equal to
Baseline (W0) or worst swollen and tender joints counts), will be given the option to enroll
in C87084 and receive certolizumab pegol [400 mg at Entry, Week 2, and Week 4 followed by 200
mg every two weeks (Q2W)] in combination with MTX until the drug is commercially available
for the indication of Rheumatoid Arthritis (RA) in the patient's country or region or until
further notice from UCB.

All patients will continue their MTX treatment at the same stable dose as during the C87077
(NCT00580840) study, unless there is a need to reduce the dose for reasons for toxicity.

Inclusion Criteria:

- Patients must be able to understand the written Informed Consent Form (ICF)

- Patients must have achieved an ACR20 (American College of Rheumatology) response at
Week 16 and completed the entire C87077 (NCT00580840) study or patients having been
randomized at Week 18 and having met the pre-defined criteria for flare

- Patients must have complied with the protocol requirements during their participation
in C87077 (NCT00580840)

- Female patients of childbearing potential must have a negative urine pregnancy test at
Entry and must continue to have negative urine pregnancy tests throughout their study
participation

- Patients must be willing to comply with protocol

Exclusion Criteria:

- Patients must not have a diagnosis of any other inflammatory Arthritis

- Patients must not have a secondary, non-inflammatory type of Arthritis that in the
investigator's opinion is symptomatic enough to interfere with the evaluation of the
study drug on the patient's primary diagnosis of Rheumatoid Arthritis (RA)

- Patients must not have a history of an infected joint prosthesis with that prosthesis
still in situ

- Patients who do not meet the Medical History Exclusion criteria, as defined per
protocol. Examples of exclusionary criteria (not all-inclusive): pregnancy, chronic
infection, active Tuberculosis (TB), high risk of infection, Lymphproliferative
Disorder, acute or chronic Viral Hepatitis B or C, known Human Immunodeficiency Virus
(HIV), Malignancy or history of Malignancy, history of severe, progressive, and/or
uncontrolled Renal, Hepatic, Hematological, Gastrointestinal, Endocrine, Pulmonary,
Cardiac, Neurological or Cerebral Disease