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Living with Combined immunodeficiency due to OX40 deficiency

A rare inherited immune condition that makes children prone to an aggressive skin and body cancer called Kaposi sarcoma.

Understanding Combined immunodeficiency due to OX40 deficiency

Combined immunodeficiency due to OX40 deficiency is a rare condition in which T and B immune cells do not work well.

It is marked by a tendency to develop Kaposi sarcoma that starts in childhood, spreads widely and can affect the skin and other parts of the body. It begins in childhood.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Kaposi sarcoma
  • Weakened immune function
  • Enlarged spleen
  • Autoimmune anemia (Coombs-positive hemolytic anemia)
  • Low blood cell counts (pancytopenia)

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include allergy and immune system specialists, cancer specialists and genetic specialists.

  3. Consider genetic testing

    Changes in TNFRSF4 are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

  4. Connect with expert centers

    Immune Deficiency Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Allergy and immune system specialists (allergists / immunologists); Cancer specialists (oncologists); Genetic specialists (geneticists)
Expert care
Expert lists: Immune Deficiency Foundation
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Immune Deficiency Foundation
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Should we have genetic testing for the TNFRSF4 gene?
What skin or body checks should we have?
Which specialists should be on our care team?

Quick facts

Symptoms usually startChild
InheritanceAutosomal Recessive
GenesTNFRSF4

Changes in the TNFRSF4 gene are listed. It is autosomal recessive, so a child inherits a changed copy from each parent.

Genetic

Also known as: combined immunodeficiency with childhood-onset kaposi sarcoma; combined immunodeficiency with impaired immunity to hhv-8; combined immunodeficiency with impaired immunity to human herpes virus 8; immunodeficiency 16; immunodeficiency type 16; ox40 deficiency

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Combined immunodeficiency due to OX40 deficiencyGARD ID 17710 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

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