Myelodysplastic Syndromes in VEXAS

Area of Science:

• Hematology
• Genetics
• Immunology

Background:

• VEXAS syndrome is a clonal hemato-inflammatory disorder affecting older males.
• It stems from somatic UBA1 gene mutations, crucial for ubiquitination.
• This leads to endoplasmic reticulum stress and systemic inflammation.

Purpose of the Study:

• To review the distinct myelodysplastic syndromes (MDS) features in VEXAS syndrome.
• To summarize hematopoietic system defects and clinical findings.
• To discuss treatment strategies for VEXAS-associated MDS.

Main Methods:

• Literature review of VEXAS syndrome and MDS.
• Analysis of hematopoietic defects and peripheral blood/bone marrow findings.
• Examination of histological and molecular characteristics.

Main Results:

• UBA1 mutations cause loss of UBA1b isoform, protein misfolding, and ER stress.
• 30-50% of VEXAS patients develop MDS, unlike 1% of unselected MDS patients.
• VEXAS-associated MDS has unique clinical, laboratory, and morphological features.

Conclusions:

• VEXAS-associated MDS is a challenging diagnosis with distinct characteristics.
• Understanding these features is crucial for accurate diagnosis and prognosis.
• Further research into treatment strategies, including hypomethylating agents, is warranted.