Clinical Immunology · CD70 deficiency

The Biology of an Impaired Immune Signal

At a Glance

CD70 deficiency is an inherited immune disorder that weakens CD70–CD27 signaling, making it harder for T cells to clear EBV. Some patients also have low antibodies and recurrent infections, while persistent EBV can cause abnormal lymphocyte growth and lymphoma.

To understand CD70 deficiency, it helps to think of the immune system as a complex network of communication. When a virus like Epstein-Barr (EBV) enters the body, your immune cells must “talk” to one another to coordinate an attack. In patients with this condition, an important piece of communication equipment is impaired.

The Costimulatory Mechanism

The immune system relies on specific protein interactions to expand and sustain its defenses. CD70 is a protein (called a ligand) that is inducibly expressed on activated immune cells, including B cells ^[1]. Its partner is CD27, a receptor expressed on various immune cells, notably T cells, which are the specialized soldiers of the immune system ^[1].

When a B cell is infected with EBV, the interaction between CD70 and CD27 provides a vital costimulatory signal that supports the T cells, allowing them to multiply, survive, and mount an effective effector response to destroy the infected cells ^[2]^[3].

Without adequate CD70 signaling, the T cells may still recognize the virus, but they lack this robust support needed to effectively clear the infection ^[2]. This allows EBV-infected cells to persist and grow, which is why the virus remains active (viremia) and can eventually lead to uncontrolled cell growth (lymphoma) ^[1]^[4].

Inheriting the Condition

CD70 deficiency is an autosomal recessive disorder. This means it is not caused by something a parent did or didn’t do, but rather by the specific combination of genes inherited from both parents ^[1]. It can happen in any family.

Carriers: Each parent typically carries one mutated copy of the CD70 gene and one healthy copy. Carriers usually have no symptoms.
Recurrence Risk: When both parents carry a pathogenic variant, each pregnancy has a 25% chance of being affected, a 50% chance of being a carrier, and a 25% chance of inheriting neither familial variant ^[1].

Why Antibodies are Affected

While the main problem is the T cell’s impaired ability to clear EBV, the CD70-CD27 interaction is also important for the B cells themselves. This signaling pathway supports B cells in maturing into memory B cells—the cells that remember a virus and produce antibodies (immunoglobulins) to fight it off in the future ^[1]^[5].

In CD70 deficiency, this maturation process is impaired. This can lead to hypogammaglobulinemia (low levels of antibodies in the blood) in some patients ^[1]. This explains why some individuals with this condition don’t just struggle with EBV; they also tend to get frequent “standard” infections like sinus, ear, and lung infections because their body isn’t making enough protective antibodies ^[4]^[6].

“Look-Alike” Conditions

Because EBV vulnerability is a feature of several rare immune disorders, CD70 deficiency can be easily confused with other conditions. Doctors use a combination of genetic and functional testing to tell them apart because the treatments and long-term risks can differ.

Condition	The Mechanism	Key Features
CD27 Deficiency	The receptor is broken, not the ligand ^[1].	Has substantial clinical overlap with CD70 deficiency, as it affects the same pathway ^[7].
XLP1 (SH2D1A)	A defect in the SAP protein ^[8].	Typically seen in males (X-linked). Associated with severe EBV infection, HLH, and lymphoma ^[9].
XIAP Deficiency (XLP2)	A defect in cell-death and inflammatory signaling ^[10].	High risk of HLH and inflammatory bowel disease (Crohn-like symptoms) ^[11].
X-MEN Syndrome (MAGT1)	A defect in magnesium transport ^[12].	Involves impaired NKG2D expression and can present with EBV viremia, lymphoma, and sometimes low magnesium ^[13].
STK4 Deficiency	A defect in cell survival ^[14].	Can feature recurrent non-EBV infections, low CD4+ T cell counts, and EBV-associated lymphoproliferation ^[15].

Understanding the specific genetic and biological defect allows the medical team to tailor monitoring and treatment strategies to the exact immune impairment ^[1].

Common questions in this guide

What does CD70 deficiency do to the body’s response to EBV?

CD70 deficiency weakens the CD70–CD27 signal that helps T cells multiply, survive, and attack EBV-infected B cells. The virus may therefore persist in the blood and allow infected cells to grow abnormally, increasing the risk of EBV-associated lymphoproliferative disease or lymphoma.

How is CD70 deficiency inherited in a family?

It is inherited in an autosomal recessive pattern, so an affected person usually has a pathogenic CD70 variant in both gene copies. If both parents are carriers, each pregnancy has a 25% chance of being affected, a 50% chance of being a carrier, and a 25% chance of inheriting neither family variant.

Why can CD70 deficiency cause low antibodies and repeated infections?

CD70–CD27 signaling helps B cells mature into memory B cells, which support lasting antibody production. When this process is impaired, some people develop hypogammaglobulinemia and have repeated sinus, ear, or lung infections.

How do doctors tell CD70 deficiency apart from similar EBV disorders?

Doctors combine genetic testing with functional immune testing to identify whether the problem involves CD70, CD27, SAP, XIAP, MAGT1, or STK4. The results help distinguish CD70 deficiency from CD27 deficiency, XLP1, XIAP deficiency, X-MEN syndrome, and STK4 deficiency, which can have overlapping EBV-related features.

What does CD70 deficiency mean for vaccine-related antibody protection?

Because CD70–CD27 signaling supports memory B-cell development, impaired signaling can affect how well the body forms and maintains antibodies. The medical team can review antibody levels and immune testing to assess responses to earlier vaccinations; the result may differ from one person to another.

Why is monitoring important when someone has CD70 deficiency?

Poor control of EBV can lead to persistent viremia and abnormal growth of infected lymphocytes, including lymphoma. Monitoring helps the medical team watch for EBV activity, antibody problems, recurrent infections, and other signs of immune complications.

Get notified when new evidence is published on EBV-induced lymphoproliferative disease due to CD70 deficiency.

We monitor PubMed for new peer-reviewed studies on this topic and email a short summary when something meaningful changes.

References (15)

1
Combined immunodeficiency and Epstein-Barr virus-induced B cell malignancy in humans with inherited CD70 deficiency.
Abolhassani H, Edwards ES, Ikinciogullari A, et al.
The Journal of experimental medicine 2017; (214(1)):91-106 doi:10.1084/jem.20160849.
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2
Inherited CD70 deficiency in humans reveals a critical role for the CD70-CD27 pathway in immunity to Epstein-Barr virus infection.
Izawa K, Martin E, Soudais C, et al.
The Journal of experimental medicine 2017; (214(1)):73-89 doi:10.1084/jem.20160784.
PMID: 28011863
3
Signaling via a CD27-TRAF2-SHP-1 axis during naive T cell activation promotes memory-associated gene regulatory networks.
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Immunity 2024; (57(2)):287-302.e12 doi:10.1016/j.immuni.2024.01.011.
PMID: 38354704
4
CD70 Deficiency Associated With Chronic Epstein-Barr Virus Infection, Recurrent Airway Infections and Severe Gingivitis in a 24-Year-Old Woman.
Krüger R, Martin E, Dmytrus J, et al.
Frontiers in immunology 2020; (11()):1593 doi:10.3389/fimmu.2020.01593.
PMID: 32849540
5
Clinical Significance of Down-Regulated CD70 and CD27 Expression in Poor Prognosis of Esophageal Squamous Cell Carcinoma.
Shan TT, Zhao X, Zhang Z, et al.
Cancer management and research 2020; (12()):6909-6920 doi:10.2147/CMAR.S241377.
PMID: 33204151
6
Pediatric Plasmablastic Lymphoma in the Setting of CD70 Deficiency.
Baskin K, Vural O, Haskologlu S, et al.
Journal of pediatric hematology/oncology 2024; (46(8)):438-441 doi:10.1097/MPH.0000000000002948.
PMID: 39262383
7
Distinct EBV-Associated Phenotypes Due to a Novel Homozygous Missense Variant in CD27.
Yang R, Turunbedu SK, Nandiwada S, et al.
bioRxiv : the preprint server for biology 2026; doi:10.64898/2026.01.15.698722.
PMID: 41607518
8
2B4-SAP signaling is required for the priming of naive CD8+ T cells by antigen-expressing B cells and B lymphoma cells.
Huang YH, Tsai K, Tan SY, et al.
Oncoimmunology 2017; (6(2)):e1267094 doi:10.1080/2162402X.2016.1267094.
PMID: 28344876
9
Case report: EBV-related eye orbits and sinuses lymphohistiocytic infiltration responsive to rituximab in a patient with X lymphoproliferative syndrome type 1.
Giardino G, Lanni V, Mascolo M, et al.
Frontiers in immunology 2024; (15()):1370991 doi:10.3389/fimmu.2024.1370991.
PMID: 38633254
10
X-linked inhibitor of apoptosis protein deficiency: more than an X-linked lymphoproliferative syndrome.
Aguilar C, Latour S
Journal of clinical immunology 2015; (35(4)):331-8 doi:10.1007/s10875-015-0141-9.
PMID: 25737324
11
Late presentation of X-linked inhibitor of apoptosis (XIAP) deficiency in a young adult.
Nazarali S, Derfalvi B, Clark P
Allergy, asthma, and clinical immunology : official journal of the Canadian Society of Allergy and Clinical Immunology 2025; (21(1)):19 doi:10.1186/s13223-025-00965-4.
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12
An Update on XMEN Disease.
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Journal of clinical immunology 2020; (40(5)):671-681 doi:10.1007/s10875-020-00790-x.
PMID: 32451662
13
Magnesium transporter 1 (MAGT1) deficiency causes selective defects in N-linked glycosylation and expression of immune-response genes.
Matsuda-Lennikov M, Biancalana M, Zou J, et al.
The Journal of biological chemistry 2019; (294(37)):13638-13656 doi:10.1074/jbc.RA119.008903.
PMID: 31337704
14
EBV Negative Lymphoma and Autoimmune Lymphoproliferative Syndrome Like Phenotype Extend the Clinical Spectrum of Primary Immunodeficiency Caused by STK4 Deficiency.
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15
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This page is for informational purposes only and does not constitute medical advice. An immunologist or genetic counselor should interpret your genetic and immune test results with you.