Home VEXAS 101

VEXAS 101

Everything you need to understand VEXAS syndrome — written for patients, caregivers, and anyone looking for answers.

What is VEXAS syndrome?

VEXAS (Vacuoles, E1 enzyme, X-linked, Autoinflammatory, Somatic) is a recently discovered inflammatory disease caused by a somatic mutation in the UBA1 gene. Unlike inherited conditions, this mutation develops during a person's lifetime — it is not passed from parent to child.

Co-discovered in 2020 by Drs. David Beck and Peter Grayson at the NIH and published in the New England Journal of Medicine, VEXAS affects approximately 1 in 4,000 men over age 50 in the United States — making it more common than many well-known inflammatory conditions, yet still widely unrecognized.

What does VEXAS stand for?
VEXAS

Vacuoles — abnormal spaces seen in bone marrow cells

E1 enzyme — the UBA1 enzyme that is mutated

X-linked — the UBA1 gene is on the X chromosome

Autoinflammatory — the body attacks its own tissues

Somatic — the mutation happens during life, not inherited

Symptoms & Diagnosis

VEXAS can mimic many other conditions — which is why the average time to diagnosis is 3–5 years. Symptoms span multiple organ systems and vary significantly between patients.

Recurrent Fevers
Unexplained, often high fevers that return repeatedly without obvious cause
Anemia
Low red blood cell counts causing fatigue, weakness, and shortness of breath
Skin Inflammation
Rashes, skin lesions, or ear and nose cartilage swelling (relapsing polychondritis)
Lung Involvement
Pulmonary infiltrates, chronic cough, and breathing difficulties
Blood Disorders
Myelodysplastic features and low platelet counts (thrombocytopenia)
Joint Pain
Arthritis-like joint inflammation, often previously diagnosed as rheumatoid arthritis

Frequently misdiagnosed as: MDS (myelodysplastic syndrome), relapsing polychondritis, rheumatoid arthritis, Sweet syndrome, or other autoinflammatory conditions. If you've received one of these diagnoses with ongoing unexplained symptoms, ask your physician about UBA1 testing.

How is it confirmed? A genetic test of your blood checks for a pathogenic UBA1 mutation that confirms VEXAS syndrome. Testing is widely available, and our network of VEXAS medical centers provides specialized expertise for diagnosis, treatment, and ongoing care. Find a VEXAS medical center →

Treatment Landscape

There are currently no FDA-approved treatments specifically for VEXAS. Physicians use existing approved drugs off-label, while clinical trials work toward better options.

Common first-line (off-label)
Corticosteroids (Prednisone)

Often the first treatment used for inflammation control. Provides short-term relief but long-term use carries significant side effects including bone density loss and immune suppression.

Off-label / Investigational
Azacitidine

A hypomethylating agent showing promise in patients who don't respond to steroids. Currently under study in a Phase II NIH clinical trial (view trial →).

Off-label / Investigational
JAK Inhibitors (Ruxolitinib)

Being studied for inflammatory suppression in VEXAS. Active trials ongoing at NYU Langone and Mayo Clinic. Results expected 2027.

Potentially curative
Bone Marrow Transplant (BMT / HSCT)

Allogeneic stem cell transplant is the only known potential cure for VEXAS. It is not appropriate for all patients. Many patients in our community have navigated this decision — read their stories →

Treatment decisions should always be made in consultation with an experienced physician. VEXAS is complex and management varies significantly by patient. Consider seeking care at a VEXAS medical center.

Patient Stories

Real stories from people living with VEXAS — their journeys to diagnosis, their treatment decisions, and their lives today.

Mark

“Today, I am living in remission because researchers kept asking questions, physicians kept learning, patients shared information, and new treatment possibilities emerged.”

Mark
Diagnosed with VEXAS, 2023 · San Jose, California
Read Mark's full story

My journey with VEXAS began years before VEXAS even had a name.

My symptoms started around 2016, with recurring inflammation, painful skin lesions, fevers and overwhelming fatigue. In December 2017, I was diagnosed with histiocytoid Sweet’s syndrome (HSS). At the time, we were told it would likely progress to myelodysplastic syndrome (MDS) within about 18 months. And then we waited.

Eighteen months passed, then another year, and another. I didn’t develop MDS as expected, but I was far from well. For large stretches of those years, the fatigue was so debilitating that I was almost bedridden. Prednisone was the one thing that could reliably control the inflammation, but it came at a tremendous cost. I was dependent on steroids, sometimes at very high doses, for more than seven years. The years of prednisone left behind muscle, bone and other damage that I’m still dealing with today.

Then, in early 2023, I came across an article in a Sweet’s Syndrome Facebook support group about a newly discovered disease called VEXAS syndrome and it sounded exactly like what I had been experiencing.

I took the article to my doctors. At the time, testing wasn’t easy to find. They ultimately located a company in Germany that could test a saliva sample for the UBA1 mutation associated with VEXAS.

In June 2023, after years of searching for answers, I finally had a diagnosis: VEXAS syndrome.

Having a name for what was happening was an enormous relief. But it was also frightening. One of our first internet searches brought up information suggesting a 50% mortality rate within five years of diagnosis. After finally finding an answer, that was terrifying to read.

But the diagnosis also gave my doctors a new direction.

Eventually, I began treatment with azacitidine (Vidaza). Ironically, it was the same medication I likely would have received years earlier if the MDS we had been warned about in 2017 had become severe enough to require treatment.

Azacitidine hasn’t been easy. The cycles brought side effects, including a metallic taste, loss of appetite and difficulty maintaining my weight and strength. But for the first time, a treatment was addressing more than the symptoms.

After 16 cycles, blood testing could no longer detect my VEXAS-associated UBA1 mutation at the test’s reporting threshold. I am now considered to be in remission.

I know remission isn’t the same as a cure, and there are still health issues and unanswered questions. But I am in a very different place today.

Whenever I tell my VEXAS story, I have to talk about my wife too. She has been there through all of it, asking questions, documenting treatments and symptoms, pushing for medication approvals and helping manage the complexities of my care when I didn’t have the energy to do it myself. I know I’m not the only person with VEXAS who depends on someone they love to help them through this.

When I first became sick, VEXAS hadn’t even been discovered. Today, I am living in remission because researchers kept asking questions, physicians kept learning, patients shared information, and new treatment possibilities emerged.

That is what gives me hope for what comes next.

“Most importantly, I feel so much better than before. There is still a way to go, but I am hopeful about where things are heading.”

Ian
Diagnosed with VEXAS, 2024 · Sydney, Australia
Read Ian's full story

My name is Ian, and I have been diagnosed with VEXAS Syndrome.

My journey started in 2017 with some rather bizarre floating pains. One moment the pain would be in my thighs, then later in my ankles, shins or arms. At other times, it seemed to be everywhere. Around the same time, I suddenly started to suffer from tinnitus.

After a couple of months believing it would just clear up by itself, I saw my GP. That began years of appointments, blood tests and scans, but no answers. By 2018, I had become so frustrated that I decided to give up on the medical profession and just put up with it.

But as 2018 became 2019, then 2020, the symptoms kept increasing.

Sleep was almost impossible because of the pain, and the lethargy was intense. Getting ready for work required several rest periods, and I was no longer physically capable of doing my job as an Operations Controller for a large bus depot. I changed roles to become a roster clerk, which allowed me to work from home when required.

The breathlessness and lethargy continued to increase, to the point where I could no longer even walk to the staff cafeteria. My face became swollen, one eye was swollen shut, and I developed a purple rash from my neck to my shins. Still, I persisted until I collapsed at work in December 2023 and was admitted to Westmead Hospital in Sydney.

After weeks of testing, I was discharged without a diagnosis and with enough pills to choke a horse.

Still looking for answers, I saw a private rheumatologist who shared photographs of my symptoms with colleagues. One of those specialists recognised what he was seeing as possible VEXAS.

In March 2024, I finally had an explanation for what had been happening to me. Genetic testing that had been ordered months earlier came back and confirmed it: I was positive for VEXAS Syndrome, with a Met41Thr UBA1 variant and a VAF of 59%.

Treatment began with high-dose prednisolone and several steroid-sparing medications. Each time I tried to reduce the prednisolone below 20 mg, however, the VEXAS would flare and I would have to increase the dose again. My VAF had also risen to 73%.

Working together, my rheumatologist and haematologist recommended azacitidine.

The improvement since starting azacitidine has been dramatic. My prednisolone is now down to just 2 mg per day and continuing to decrease. My rash has disappeared, my blood work is almost normal and stable, and my VAF has fallen to 25%.

Most importantly, I feel so much better than before.

There is still a way to go, but I am hopeful about where things are heading.

If I could offer one piece of advice to someone else on this journey, it would be to advocate for yourself. VEXAS is still a very new disease, and there is still much being learned about how best to treat it. Do not blindly accept a specialist’s word for it. Ask questions and ask for the information they have. And if you are not happy with your treatment, find another specialist team. Finding the right specialist team made an enormous difference for me.

Joe Holman

"After my bone marrow transplant, I was terrified and didn't know what to expect. The Foundation's resources helped me understand the process and connected me with others who had been through it."

Joe Holman
President & Chair · Diagnosed with VEXAS, 2023
The strength of a VEXAS patient is not always visible. It lives in the decision to rise again after the disease has taken so much, and to meet another uncertain day with courage. A spouse and caregiver becomes the strength beside that strength, protecting hope, seeking answers, sharing knowledge, supporting others, and raising funds for research that can change what comes next. VEXAS has altered our lives, but it has also deepened our purpose.
Audrey Shay Spouse and VEXAS advocate

Frequently Asked Questions

Is VEXAS inherited? Can I pass it to my children?
No. VEXAS is caused by a somatic (acquired) mutation that develops during your lifetime — it is not inherited from parents and cannot be passed to your children.
Does VEXAS only affect men?
VEXAS predominantly affects men because the UBA1 gene is on the X chromosome. Men have only one copy, so a single mutation causes disease. Women have two X chromosomes providing a backup, though female cases have been reported and are an active area of research.
Why does VEXAS appear to affect fewer Black patients?
This is an active area of inquiry. Researchers are investigating whether there is a biological explanation, or whether disparities in access to testing and specialty care contribute to underdiagnosis. The research community is actively studying this important question.
How do I get tested for VEXAS?
Ask your physician about UBA1 mutation testing via a blood or bone marrow biopsy. Testing is widely available, and our network of VEXAS medical centers provides specialized expertise for diagnosis, treatment, and ongoing care.
What is the prognosis for VEXAS?
Prognosis varies widely depending on disease severity, organ involvement, and treatment response. Bone marrow transplant offers a potential cure for eligible patients. Research into better treatments is ongoing and rapidly advancing — the pace of discovery since 2020 has been remarkable.
Are there clinical trials I can join?
Yes. Several trials are actively recruiting VEXAS patients, including a Phase II NIH study on azacitidine and a JAK inhibitor study at NYU and Mayo Clinic. Browse current studies and eligibility criteria on ClinicalTrials.gov.

Resources

Curated resources for patients, caregivers, and healthcare providers.

Free Patient Guide
VEXAS 101 Syndrome Resource Guide
35 pages · October 2025 · Created by the VEXAS Foundation Inc.
We refer to this resource guide as “VEXAS 101” because it serves as a clear starting point for understanding VEXAS syndrome. It is designed to help patients, caregivers, healthcare providers, and loved ones better understand the disease, support conversations with physicians who may be unfamiliar with VEXAS, and increase awareness through reliable, accessible information. We believe education is empowering, and our goal is to help shorten the time to diagnosis, improve clinical care, and ultimately lead to better outcomes for everyone affected by VEXAS.
Get the guide

Medical Disclaimer: The VEXAS 101 Resource Guide and information on this page are provided for general information and educational purposes only. Only healthcare professionals can properly advise patients about VEXAS syndrome and its related treatment options. This content does not constitute medical advice.

Scroll to Top