Bronchiolitis obliterans in patients undergoing allogeneic hematopoietic SCT

Area of Science:

• Pulmonary Medicine
• Hematology
• Transplantation Immunology

Background:

• Bronchiolitis obliterans (BO) is a serious pulmonary complication following allogeneic stem cell transplantation (allo-SCT).
• Understanding its incidence, risk factors, and prognosis is crucial for patient management.
• This study focuses on a cohort undergoing allo-SCT at Hospital Universitário da Universidade Federal do Paraná.

Purpose of the Study:

• To determine the incidence of BO in patients after allo-SCT.
• To identify risk factors associated with the development of BO.
• To evaluate prognostic factors for patients diagnosed with BO.

Main Methods:

• Retrospective analysis of 1286 patients who underwent allo-SCT between 1979 and 2009 and survived over 100 days.
• Diagnosis of BO based on established criteria.
• Multivariate analysis to identify risk and prognostic factors.

Main Results:

• The cumulative incidence of BO was 2.9% at 1 year and 3.7% at 3 years.
• Patients with chronic graft-versus-host disease (GVHD) had a higher incidence (9.9% at 3 years).
• Risk factors identified: female donor, older recipient age, and acute GVHD. Earlier diagnosis (<260 days) correlated with worse prognosis. Severity of pulmonary impairment was the main prognostic factor.

Conclusions:

• Bronchiolitis obliterans (BO) is a significant complication of allo-SCT with a notable incidence.
• Female donor, older recipient age, and acute GVHD are key risk factors for BO development.
• Pulmonary impairment severity and early onset are critical prognostic indicators, with BO being the primary cause of death in affected patients.