Clinical Scorecard: Hematopoietic Stem Cell Transplantation Alters Age-Related Gut Microbiome Profiles in Both Pediatric and Adult Patients
At a Glance
Category
Detail
Condition
Allogeneic hematopoietic stem cell transplantation (allo-HSCT) and its impact on gut microbiome (GM)
Key Mechanisms
Alterations in gut microbiome diversity and composition influenced by age and transplant procedures; associations between GM signatures and clinical outcomes such as graft-versus-host disease (GvHD) and survival
Target Population
Pediatric and adult patients undergoing allo-HSCT
Care Setting
Adult and pediatric transplant units in hospital setting
Key Highlights
Higher gut microbiome alpha diversity before transplant and at neutrophil engraftment correlates with improved overall survival and reduced GvHD-related mortality in adults.
Distinct gut microbiome signatures, including loss of beneficial taxa (e.g., Blautia) and overgrowth of pathogens (e.g., Enterococcus), are linked to increased risk of GvHD and infections.
Age influences gut microbiome composition and response to allo-HSCT, with pediatric patients experiencing larger microbiome shifts and more frequent myeloablative conditioning.
Guideline-Based Recommendations
Diagnosis
Assess gut microbiome diversity and composition before conditioning regimen and at neutrophil engraftment using stool samples and 16S rRNA sequencing.
Grade acute GvHD according to Mount Sinai Acute Gvhd International Consortium (MAGIC) criteria.
Management
Administer fluoroquinolone antibiotic prophylaxis starting at conditioning regimen until febrile neutropenia onset or neutrophil engraftment.
Consider age-related differences in conditioning intensity and microbiome disruption when planning transplant procedures.
Monitoring & Follow-up
Monitor neutrophil counts daily to define neutrophil engraftment (three consecutive days with neutrophils >0.5 × 10⁹/L).
Track gut microbiome changes longitudinally pre- and post-transplant to identify risk profiles for GvHD and infections.
Risks
Loss of gut microbiome diversity and beneficial commensals increases risk of GvHD and infection complications.
Overgrowth of opportunistic pathogens such as Enterococcus and Fusobacterium is associated with adverse outcomes.
Pediatric patients may experience greater microbiome disruption due to more frequent use of myeloablative conditioning.
Patient & Prescribing Data
Mixed cohort of pediatric and adult allo-HSCT recipients at a single hospital center.
Fluoroquinolone prophylaxis is standard; microbiome profiles differ by age and conditioning regimen intensity, influencing clinical outcomes.
Clinical Best Practices
Collect stool samples before conditioning and at neutrophil engraftment for microbiome analysis to guide risk stratification.
Implement shared antibiotic stewardship programs across adult and pediatric transplant units to optimize prophylaxis.
Use standardized criteria (MAGIC) for GvHD grading to ensure consistent outcome assessment.
Consider age-specific microbiome characteristics when interpreting microbiome data and planning interventions.
