Condition category
Musculoskeletal Diseases
Date applied
Date assigned
Last edited
Retrospectively registered
Overall trial status
Recruitment status

Plain English Summary

Background and study aims
Rheumatoid arthritis (RA) is a long-term disease causing pain, swelling and stiffness in the joints. It is a disease of the immune system, known as an autoimmune disease, in which the immune system starts to attack healthy joints. In healthy people, the body produces different types of immune cell. One of these types is the B-cell, which produces antibodies to fight infection. In people with RA, these do not behave properly and produce antibodies which attack a person’s own body even if there is no infection. One of the common treatments for RA is the medication rituximab (RTX). In the body, this medication works to reduce the number of B-cells, stopping them from producing antibodies which will attack the healthy cells. This study is looking at people with RA who are in remission. The aim of this study is to find out whether or not lowering the dose of rituximab in these patients will cause the disease to flare up.

Who can participate?
Adults diagnosed with rheumatoid arthritis being treated with rituximab with low disease activity/are in remission

What does the study involve?
Participants are randomly divided into two groups. The first group continues to receive their current does of rituximab (RTX), of 1000mg every 6 months. The second group receives a lower dose of 500mg every 6 months. Participants in each group continue on these doses for two years. They are then be tested to find out whether or not the activity of the disease has increased.

What are the possible benefits and risks of participating?
There are no immediate benefits of participating in the study. After the results have been analysed (in about 4 years), the time it takes to receive the infusion will be shorter with the reduced dose, causing the treatment to be less inconvenient. Also, the cost of treatment will be less, which could be considered as a benefit. There are no particular risks of participating, however there is a small risk that patients in the lower dose group may experience return of their disease. In that case, rituximab dose may be raised again or it may be necessary to switch to another medication.

Where is the study run from?
Medical University of Vienna (Austria)

When is the study starting and how long is it expected to run for?
January 2015 to December 2019

Who is funding the study?
Medical University of Vienna (Austria)

Who is the main contact?
Professor Klaus Machold

Trial website

Contact information



Primary contact

Prof Klaus Machold


Contact details

Medical University of Vienna
Waehringer Guertel 18-20
+43 1 40400 43010

Additional identifiers

EudraCT number

2015-002156-27 number

Protocol/serial number


Study information

Scientific title

Randomized, prospective, active-comparator controlled, patient-blinded study to demonstrate non-inferiority of reduced-dose Rituximab in rheumatoid arthritis patients in low disease activity and remission: the REDOREM study



Study hypothesis

In patients with RA who are in persistent low disease activity or persistent remission a reduced dose of 1x500mg intravenous RTX semi-annually will not lead to a higher frequency of patients experiencing disease flares compared with the continuation of 1x1000mg intravenous RTX semi-annually

Ethics approval

Ethics committee of the Medical University of Vienna, 01/09/2015, ref: 1356/2015

Study design

Single-centre randomized prospective active-comparator controlled patient-blinded study

Primary study design


Secondary study design

Randomised controlled trial

Trial setting


Trial type


Patient information sheet

Not available in web format, please use the contact details below to request a patient information sheet.


Rheumatoid arthritis


Bi-annual infusion of rituximab at two doses: 1000 mg or 500 mg

Intervention type



Drug names


Primary outcome measures

Increased disease activity ("flare") during the treatment period of 2 years. Flare is defined as a change in DAS28 of >1.2 or an increase in DAS28 of 0.6-1.2 if this results in DAS28 >3.2 (“reverse” EULAR improvement criteria). The DAS28 is a composite measure consisting of tender and swollen joint counts, the subjective assessment of disease activity by the patient, and the erythrocyte sedimentation rate (ESR). It will be recorded every three months (at routine visit time points) during the planned observation period of 2 years.

Secondary outcome measures

1. Number of patients remaining in low disease activity or remission in the two treatment groups
2. Difference in radiographic progression between the treatment groups over two years
3. Difference in functional outcome between the treatment groups over a monitoring period of two years

Overall trial start date


Overall trial end date


Reason abandoned


Participant inclusion criteria

1. Diagnosis of Rheumatoid arthritis (RA) according to the 2010 ACR/EULAR classification criteria (14)
2. Current treatment with RTX (at time of inclusion have already received at least 2 cycles of >/=1000mg RTX at least six months apart) at the Day-Clinic of the Division of Rheumatology of the Medical University of Vienna
3. Persistent low disease activity or clinical remission

Participant type


Age group




Target number of participants


Participant exclusion criteria

1. Aged 18 years or younger
2. Receiving rituximab for a disease other than Rheumatoid arthritis
3. Failing to meet criteria for remission or low disease activity at either one of the two successive timepoints (i.e. having a disease activity >10 as measured by the clinical disease activity index, (CDAI)
4. Female patients of childbearing potential not willing to practice effective contraception throughout treatment with RTX and twelve months thereafter
5. Pregnant or lactating women

Recruitment start date


Recruitment end date



Countries of recruitment


Trial participating centre

Medical University of Vienna
Department of Rheumatology Waehringer Guertel 18-20

Sponsor information


Medical University of Vienna

Sponsor details

Division of Rheumatology
Department of Internal Medicine 3
Waehringer Guertel 18-20
+43 1 40400 43010

Sponsor type

Hospital/treatment centre



Funder type


Funder name

Medizinische Universität Wien

Alternative name(s)

Medical University of Vienna, MediUni Wien

Funding Body Type

government organisation

Funding Body Subtype

government non-federal



Results and Publications

Publication and dissemination plan

The results (primary and secondary outcomes) of this trial will be submitted for publication in a peer-reviewed medical journal, regardless of the outcome. It is foreseen that the total duration of the trial (first patient’s first visit to last patient’s last visit) will be four years, therefore, in case a start is possible in Q4 2015, the trial will be completed in Q1 2020. A submission for publication should be feasible within one year.

Intention to publish date


Participant level data

Available on request

Results - basic reporting

Publication summary

Publication citations

Additional files

Editorial Notes

23/05/2016: Ethics approval information added.