ClinicalTrials.gg
TerminatedNCT01156922Updated Mar 4, 2024

B-cell Depletion Using the Monoclonal Anti-CD20 Antibody Rituximab in Very Severe Chronic Fatigue Syndrome

A Phase 2 interventional study of Rituximab in Chronic Fatigue Syndrome and Myalgic Encephalomyelitis, sponsored by Haukeland University Hospital. Terminated at 1 site in Norway. Open to participants aged 18 Years to 66 Years. Per ClinicalTrials.gov, last updated 2024-03-04.

Sponsored by Haukeland University Hospital · Phase 2, Interventional, and Treatment

Why this study was terminated
Difficulties in logistics handling the very severe patients (travel, hospital stay, follow-up)

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Phase
Phase 2
Study type
Interventional
Enrollment
8
Allocation
Not applicable
Ages
18 Years to 66 Years
Sex
All
01

Where this study stands

Counted across the records on this site · 2026-11-14

Among 25 studies in Fatigue Syndrome, Chronic with a site in Norway — 2 open to participants now, 2 under way, none of them phase 3. Fatigue Syndrome, Chronic · Norway.

Enrollment
16th of 20
8 · median 45
Started
2010
with 3 others
Phase 2
6 of 25
none open now
Registered
5th of 25
by date
Lead sponsor
7 of 25
Haukeland University Hospital

Among the 25 studies in Fatigue Syndrome, Chronic with a site in Norway, this one is the 16th largest by enrollment of the 20 interventional ones that give a count, is one of 4 that started in 2010, is one of 6 in phase 2, and was the 5th registered.

Fatigue Syndrome, Chronic

264 studies on the registry are indexed under Fatigue Syndrome, Chronic; 62 are open to participants now.

Browse Fatigue Syndrome, Chronic studies →

Open to participants now

2 of the 25 studies in Fatigue Syndrome, Chronic with a site in Norway are open now. Recruiting first, the newest first:

All 2 open studies →

A study can be open while its sites in Norway have not opened yet or have stopped. Only those recruiting at a site in Norway →

Who these studies take

Of the 44 Fatigue Syndrome, Chronic studies recruiting now, 18 (41%) set no upper age limit and 20 (45%) stop at 75 or younger; 5 take children under 18; 10 take healthy volunteers.

This study: 18 Years to 66 Years · all sexes · no healthy volunteers.

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02

Study summary

Based on pilot patient observations, and experience from the prior study KTS-1-2008, the investigators anticipate that severely affected chronic fatigue syndrome patients may benefit from B-cell depletion therapy using Rituximab induction with maintenance treatment.

The hypothesis is that at least a subset of chronic fatigue syndrome (CFS) patients have an activated immune system involving B-lymphocytes, and that prolonged B-cell depletion may alleviate symptoms.

An approved amendment (April 15th 2011): the study will be extended with up to 5 patients. For up to 5 patients in the study, standard plasma exchange may be performed 2-3 weeks prior to start of B-lymphocyte depletion using Rituximab (as in the protocol).

Approved amendment (December 2011): for patients with gradual improvement in CFS/ME symptoms after 12 months follow-up, but not having reached a clear response, up to 6 additional Rituximab infusions (500 mg/m2, max 1000 mg) may be given during the following 12 months period.

03

Conditions studied

  • Chronic Fatigue Syndrome
  • Myalgic Encephalomyelitis

Keywords

  • Chronic fatigue syndrome
  • CFS
  • Myalgic encephalomyelitis
  • Rituximab
  • B-cell depletion
04

Who can participate

Ages eligible
18 Years to 66 Years
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • patients severely affected by chronic fatigue syndrome, in III or IV.
  • age 18-66 years

Exclusion criteria

Exclusion Criteria:

  • patients with fatigue, not fulfilling criteria for CFS
  • pregnancy or lactation
  • previous malignant disease except basal cell carcinoma of skin and cervical carcinoma in situ
  • previous major immunological disease, except diseases such as diabetes mellitus or thyroiditis
  • endogenous depression
  • lack of ability to comply by the protocol
  • multi-allergy with risk of serious drug reaction
  • reduced renal function (creatinin > 1.5 x upper normal limit [UNL])
  • reduced liver function ( or transaminases > 1.5 x UNL)
  • positivity
  • evidence of infection
Terms in these criteria, in plain language(6)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

ECOG performance status

A scale of how much an illness limits everyday activity. For people being assessed to join a study, scores run from 0 (fully active) to 4; lower is more active.

0
Fully active, no restrictions.
1
Limited in strenuous activity, but walking and able to do light work, such as housework or office work.
2
Walking and able to look after yourself, but unable to work; up and about more than half of waking hours.
3
Able to look after yourself only in part; in bed or a chair more than half of waking hours.
4
Unable to look after yourself at all; in bed or a chair all day.

Studies most often ask for 0–1 or 0–2. Your doctor gives the score; the WHO scale uses the same steps. The full scale also has 5, which records death.

Informed consent

Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.

You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.

Autoimmune disease

A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.

Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.

Bilirubin

A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.

Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.

HIV

The human immunodeficiency virus, which weakens the immune system.

Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.

Clinically significant

Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.

05

Study design

Phase
Phase 2
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrollment
8 participants (actual)

Study arms

  • Experimental
    Rituximab

    Rituximab induction two infusions (500 mg/m2, max 1000 mg) two weeks apart, followed by maintenance Rituximab infusions (500 mg/m2, max 1000 mg) after 3, 6, 10 and 15 months.

    Drug: Rituximab

Interventions

  • Two infusions of Rituximab 500 mg/m2 (max 1000 mg) given two weeks apart, followed by maintenance Rituximab infusions 500 mg/m2 (max 1000 mg) at 3, 6, 10, and 15 months. For up to 5 patients in the study, standard plasma exchange (one plasma volume, up to 5 treatments, during 1-2 weeks) will be performed 2-3 weeks prior to start of Rituximab therapy. Amendment: for patients with gradual improvement in CFS/ME symptoms after 12 months follow-up, but not having reached a clear response, up to 6 additional Rituximab infusions (500 mg/m2, max 1000 mg) may be given during the following 12 months period.

06

What researchers measure

Primary outcomes

  1. Symptom alleviation, as compared to baseline, measured by standardized self-reports and quality of life schemes

    The primary endpoint is defined as major response of the CFS symptoms, of at least six weeks duration, independent on when during 36 months follow-up the response period(s) occurs. Single such response periods, and the sum of these, are recorded.

    Time frame: Major response of at least six weeks duration, independent on when occuring, during the follow-up period

Secondary outcomes

  1. Symptom alleviation, as compared to baseline, measured by standardized self-reports and quality of life schemes.

    The secondary outcome measures are effect on the CFS symptoms, by evaluation at 3, 6, 10, 15, 20, 24, 30, and 36 months after first intervention (i.e. first Rituximab infusion)

    Time frame: At 3, 6, 10, 15, 20, 24, 30, 36 months after intervention

07

Study locations

1 site
  • Department of Oncology and Medical Physics, Haukeland University Hospital
    Bergen, N-5021, Norway
08

References and documents

Publications

  • Fluge O, Mella O. Clinical impact of B-cell depletion with the anti-CD20 antibody rituximab in chronic fatigue syndrome: a preliminary case series. BMC Neurol. 2009 Jul 1;9:28. doi: 10.1186/1471-2377-9-28. PubMed 19566965 ↗
  • Fluge O, Risa K, Lunde S, Alme K, Rekeland IG, Sapkota D, Kristoffersen EK, Sorland K, Bruland O, Dahl O, Mella O. B-Lymphocyte Depletion in Myalgic Encephalopathy/ Chronic Fatigue Syndrome. An Open-Label Phase II Study with Rituximab Maintenance Treatment. PLoS One. 2015 Jul 1;10(7):e0129898. doi: 10.1371/journal.pone.0129898. eCollection 2015. PubMed 26132314 ↗
09

Timeline

Tracking since Sep 25, 2026
Not marked actual or estimatedDates not marked actual or estimated

The record gives a start of Jun 2010, a primary completion of Apr 2016 and a completion of Apr 2016. It does not say whether these dates are actual or estimated.

How these figures are worked out, and which studies are left out of them.

Registered
Jul 2, 2010
First posted
Jul 5, 2010
Start
Jun 2010
Primary completionActual
Apr 2016
CompletionActual
Apr 2016
Last update
Mar 4, 2024
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Mar 4, 2024, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT01156922
Responsible party
Sponsor
First posted
Jul 5, 2010
Start date
Jun 2010
Primary completion
Apr 2016
Completion
Apr 2016
Last update
Mar 4, 2024

Study contacts

Olav Mella, PhD, MD
principal investigator · Haukeland University Hospital

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is terminated, as verified in Mar 2024. You cannot join it, but the record below documents what was studied.

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Discussion

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Studies of the drug tested here: Rituximab

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