Immunological factors are assumed to be determinants for some psychiatric disorders, thus anti-inflammatory drugs may be helpful. However, studies on such treatments are scarce. An inflammatory modulating drug rituximab, cluster of differentiation antigen 20 antibodies (anti-CD20 antibodies), is a standard treatment for e.g. multiple sclerosis.
The investigators aim to test rituximab in a randomised placebo-controlled double-blinded, add-on treatment trial in 120 participants (18-55 years) with schizophrenia spectrum disorder. Sampling from blood for analyses of inflammatory mediators are investigated at gene and protein levels and resting state functional magnetic resonance imaging (rsfMRI) and lumbar puncture are optional. Biomarkers will be investigated in relation to treatment response.
Family member(s) to the patient and the patient (separate) will be asked to participate in a qualitative interview by an independent researcher after 3 months.
Eligibility
Sex
ALL
Min age
18 Years
Max age
55 Years
Healthy volunteers
No
Inclusion Criteria:
1. ages 18 to 55 years
2. duration of illness exceeding 1 year
3. diagnosed with Schizophrenia spectrum disorder (SSD) according to The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5).
4. if female and with any risk for pregnancy, willing to use contraceptives or abstinence if normal and preferred lifestyle.
5. participants should be judged by the investigator to be lucid and oriented to person, place, time, and situation when giving the informed consent.
6. insufficiently recovered from previous antipsychotic treatments.
7. a minimum score of 4 (moderately ill) in Clinical global impression - severity (CGI-S) at baseline.
Exclusion Criteria:
1. pregnancy or breast-feeding
2. weight below 40 kg
3. clinically relevant ongoing infection at the discretion of the physician
4. chronic infections
5. positive test for hepatitis B, hepatitis C, HIV, or tuberculosis
6. malignancy currently or within 2 years prior to inclusion
7. current severe heart failure (NYHA grade IV) or any other severe heart disease (e.g. or history of cardiac arrhythmia or myocardial infarction)
8. any change of antipsychotic medication within the previous 4 weeks
9. unable to make an informed decision to consent to the trial
10. ongoing clozapine treatment
11. ongoing immunomodulatory treatment
12. treatments with monoclonal antibodies within 1 year before the inclusion
Primary outcome measure(s)
Proportion of responders to treatment, rated as much or very much improved with CGI-I — Baseline up to week 12 Improvement according to clinical rated Clinical Global Impression-Improvement (CGI-I)
This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.
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