[Rejection of allogeneic bone marrow transplant. Case report]

Area of Science:

• Hematology
• Immunology
• Oncology

Background:

• Acute myeloblastic leukemia (AML) treatment often involves allogeneic bone marrow transplantation.
• Graft rejection is a significant complication, though rare in HLA-identical transplants.
• Conditioning regimens aim to prevent rejection and eliminate residual leukemia cells.

Observation:

• A 22-year-old patient with AML in complete remission underwent an HLA-identical allogeneic bone marrow transplant.
• The patient received a high-dose busulfan conditioning regimen (16 mg/kg).
• Severe graft-versus-host disease was also observed post-transplant.

Findings:

• Despite intensive conditioning and graft-versus-host disease, the HLA-identical bone marrow transplant was rejected.
• Graft rejection was evidenced by the loss of hematopoietic function, confirmed clinically and at autopsy.
• This represents a rare instance of marrow graft failure in a leukemia patient.

Implications:

• This case underscores the complexity of bone marrow transplant rejection, even in HLA-identical settings.
• It highlights the need for further research into mechanisms of graft failure in leukemia patients.
• Understanding these rare events can inform strategies to improve transplant success rates.