Aplastic Anemia 2026 UPDATE
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In this 2026 update, oncologists Sam and Kareen from Two Onc Docs deliver a comprehensive review of aplastic anemia, emphasizing its immune-mediated pathophysiology, diagnostic criteria, and evolving treatment landscape. They clarify that aplastic anemia is an acquired bone marrow failure disorder affecting all three blood cell lines, with 75-80% of cases driven by autoreactive T cells. The episode covers key diagnostic steps, including ruling out MDS, leukemia, and PNH, and defines severity using ANC, platelet, and reticulocyte thresholds. Treatment is stratified by age and donor availability: young patients with HLA-matched siblings are prioritized for bone marrow transplant, while others receive frontline immunosuppression with horse ATG plus cyclosporine A. The hosts highlight the role of L-thrombopoietin mimetics (e.g., eltrombopag), which improve response rates but do not significantly impact two-year overall survival. They also discuss the high prevalence of clonal hematopoiesis (up to 70%) and PNH clones (up to 50%), stressing the importance of monitoring and targeted therapy with eculizumab when indicated. The episode concludes with practical takeaways for clinical decision-making and ongoing management.
Aplastic anemia is an immune-mediated bone marrow failure disorder affecting all three blood cell lines, primarily driven by autoreactive T cells.
For patients under 40 with an HLA-matched sibling, upfront bone marrow transplant is the preferred treatment; otherwise, horse ATG plus cyclosporine A is first-line immunosuppression.
Horse ATG is superior to rabbit ATG; remember 'H comes before R' as a mnemonic.
Eltrombopag increases response rates and reduces clonal evolution risk but does not improve two-year overall survival.
Up to 50% of patients develop subclinical PNH clones; monitor with flow cytometry and treat symptomatic cases with eculizumab.
…and 2 more takeaways available in PodZeus
Introduction and 2026 Update Overview
“This is actually a redo. We haven't covered this topic in quite some time, so this is our 2026 update.”
Pathophysiology and Clinical Presentation
The hosts define aplastic anemia as an acquired, immune-mediated bone marrow failure disorder affecting all three hematopoietic lineages. They discuss typical presentations including fatigue, petechiae, infections, and pancytopenia, with key lab findings such as low reticulocytes and hypoplastic bone marrow.
Diagnostic Workup and Severity Classification
The episode details the diagnostic process, emphasizing the need to rule out MDS, leukemia, and PNH. Severity is defined using bone marrow cellularity and blood count thresholds, with severe and very severe categories based on ANC, platelets, and reticulocytes.
Treatment Strategies: Immunosuppression and Transplant
“Horse ATG is seen to be superior to rabbit ATG. The way that I remembered this is that alphabetically H comes before R, so horse comes before a rabbit.”
Clonal Evolution, PNH, and Key Takeaways
“Up to 50% of aplastic anemia patients will have a PNH clone, and most are subclinical. So just watch them.”
“Horse ATG is seen to be superior to rabbit ATG. The way that I remembered this is that alphabetically H comes before R, so horse comes before a rabbit.”
“Up to 50% of aplastic anemia patients will have a PNH clone, and most are subclinical. So just watch them.”
“This is actually a redo. We haven't covered this topic in quite some time, so this is our 2026 update.”
Hosts
Kareen
person
Sam
person
PNH
other
Cyclosporine A
product
Bone Marrow Transplant
other
Eltrombopag
product
Horse ATG
product
MDS
other
Rabbit ATG
product
Eculizumab
product
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