Obstructive lung disease in children after allogeneic bone marrow transplantation

Area of Science:

• Pediatric Hematology/Oncology
• Pulmonology
• Transplantation Immunology

Background:

• Obstructive lung disease (OLD) is a known complication following allogeneic bone marrow transplantation (BMT).
• While adult OLD incidence is low (~3%), pediatric data is scarce.
• This study investigates OLD prevalence and risk factors in pediatric BMT recipients.

Purpose of the Study:

• To determine the incidence of obstructive lung disease (OLD) in pediatric patients after allogeneic bone marrow transplantation (BMT).
• To identify risk factors associated with the development of OLD in this population.

Main Methods:

• Retrospective analysis of 89 pediatric allogeneic BMTs performed between 1980-1992.
• Diagnosis of OLD based on clinical symptoms, pulmonary function tests, lung biopsy, and CT scans.
• Evaluation of 67 children surviving >90 days post-BMT for OLD development.

Main Results:

• 19.4% (13/67) of at-risk children developed OLD, with 3 cases being transient.
• High-risk factors for OLD included chronic graft-versus-host disease (GVHD) (37.1%), increased donor age, acute GVHD, and mismatched/unrelated donor transplants.
• No correlation found with methotrexate, total body irradiation, or CMV reactivity.
• In children with chronic GVHD, prior liver involvement (57.9%) was a significant predictor of OLD.

Conclusions:

• The prevalence of OLD in children post-allogeneic BMT is higher than in adults.
• Chronic GVHD, particularly with liver involvement, is a significant risk factor for pediatric OLD post-BMT.
• Further research is needed to confirm age as a risk factor for developing OLD after BMT.