Complement component 5 deficiency
MONDO:0012295A rare genetic disorder with an autosomal recessive pattern of inheritance. It is caused by the ineffective or decreased biosynthesis of the fifth complement component, C5. C5 deficiency may also be acquired acutely post-infection. If C5 is adequately synthesized, its rapid depletion may result in a functional deficiency. Clinical signs of the inherited deficiency present within the second decade of life and are consistent with the signs of recurrent systemic infection. Deficiency of serum C5 and its major cleavage product, C5b, a component of the membrane attack complex, increases susceptibility to Neisserial infections.
Also known as: C5 complement deficiency, C5 deficiency, complement component 5 deficiency, complement deficiency caused by mutation in C5, C5D, dysfunction of the fifth component of complement (C5)
54 clinical trials for this condition and its sub-types.
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New hope for kids: drug may prevent transplant complications
Disease control Not yet recruitingThis study tests whether adding the drug vorinostat to standard care can prevent graft-versus-host disease (GVHD) in children and young adults (ages 1-26) with non-cancerous blood disorders who are getting a bone marrow transplant. GVHD is a serious complication where donor cells…
Phase: PHASE2 • Sponsor: Sung Won Choi • Aim: Disease control
Last updated Jul 02, 2026 00:00 UTC
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Could a stool sample replace a spinal tap? new study tests Non-Invasive infection detection
Diagnosis Not yet recruitingThis study will test whether analyzing stool and urine samples using a technique called metagenomics can find infections in people with weakened immune systems (due to HIV, chemotherapy, or immunosuppressive drugs). Currently, doctors often need to take invasive samples like bloo…
Sponsor: Assistance Publique - Hôpitaux de Paris • Aim: Diagnosis
Last updated Jun 27, 2026 12:36 UTC
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Which infusion pump do patients prefer? new study aims to find out
Symptom relief Not yet recruitingThis study looks at how patients with primary or secondary immunodeficiency feel about using mechanical versus electronic infusion pumps for their immunoglobulin therapy. About 52 adults who have used electronic pumps will try a mechanical pump for three months and then report th…
Phase: NA • Sponsor: KORU Medical Systems, Inc. • Aim: Symptom relief
Last updated Jun 27, 2026 07:51 UTC
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New study aims to unravel mysteries of immune disorder complications
Knowledge-focused Not yet recruitingThis study looks back at medical records of about 60 people with primary immune deficiencies who also developed lymphoproliferative disorders (abnormal growth of immune cells). The goal is to track their health over time, including risks of death, cancer, or organ damage. By iden…
Sponsor: Central Hospital, Nancy, France • Aim: Knowledge-focused
Last updated Jun 27, 2026 12:06 UTC
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New study to measure how immune disorders impact Kids' happiness
Knowledge-focused Not yet recruitingThis study looks at how children aged 6 to 18 with inborn errors of immunity (a condition where the immune system doesn't work properly) feel about their quality of life. Researchers will compare their answers to those of healthy children using a special questionnaire. The goal i…
Sponsor: Sohag University • Aim: Knowledge-focused
Last updated Jun 27, 2026 08:01 UTC
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Scientists hunt for rogue immune cells in autoimmune diseases
Knowledge-focused Not yet recruitingThis study aims to better understand why some people's immune cells attack their own body, causing autoimmune diseases like lupus and scleroderma. Researchers will analyze blood samples from 200 adults with these conditions to identify and measure specific harmful immune cells. T…
Sponsor: University Hospital, Strasbourg, France • Aim: Knowledge-focused
Last updated Jun 27, 2026 08:01 UTC