Congenital Amegakaryocytic Thrombocytopenia Clinical Trials 2026 — Find Recruiting Studies

About Congenital Amegakaryocytic Thrombocytopenia

Congenital amegakaryocytic thrombocytopenia is a rare inherited bone marrow failure syndrome caused by biallelic loss-of-function mutations in MPL, encoding the thrombopoietin receptor (c-Mpl), which is essential for megakaryocyte development and hematopoietic stem cell self-renewal. The disease presents at birth with severe isolated thrombocytopenia from near-complete absence of bone marrow megakaryocytes, and progresses in most patients during the first decade to pancytopenia and aplastic anemia as hematopoietic stem cell reserves are depleted. Hematopoietic stem cell transplantation is currently the only curative treatment, with gene therapy approaches under investigation.

Common Clinical Features

Severe thrombocytopenia present from birth with platelet counts often below 20,000/uL Petechiae, purpura, and mucosal bleeding in the neonatal period Intracranial hemorrhage risk in severely thrombocytopenic neonates Absent or markedly reduced megakaryocytes on bone marrow biopsy Progressive development of pancytopenia in early childhood Normal neurological development (distinguishing from some other thrombocytopenias) Absent platelet response to thrombopoietin stimulation Recurrent need for platelet transfusions

Clinical Trial Eligibility Tips

What to know before applying to Congenital Amegakaryocytic Thrombocytopenia trials.

Biallelic MPL mutation identification with functional thrombopoietin receptor studies is required for diagnosis confirmation; type I mutations (null) generally have more severe disease and earlier progression than type II (partial loss of function).

Progression to aplastic anemia typically occurs by age 5 in type I; bone marrow biopsy showing hypocellularity is a critical eligibility marker for HSC transplant trials.

Alloantibody formation from prior platelet transfusions can complicate transplant eligibility; HLA typing and antibody screening should be performed and documented early.