Clinical Report: EASIX Score Predicts SOS and NRM in Pediatric Allo-HSCT

Overview

This retrospective study evaluated the endothelial activation and stress index (EASIX) score as a predictor of sinusoidal obstruction syndrome (SOS) and nonrelapse mortality (NRM) in pediatric patients undergoing allogeneic hematopoietic stem cell transplantation (allo-HSCT). The findings support the EASIX score's utility in assessing endothelial injury-related complications and mortality risk in this population.

Background

Endothelial injury following allo-HSCT can cause severe complications such as SOS/VOD, which negatively impact transplant success and increase NRM. Multiple factors including conditioning regimens and immunosuppressive therapies contribute to endothelial damage. The EASIX score, calculated from routine laboratory parameters (LDH, serum creatinine, and platelet count), has shown predictive value for HSCT outcomes in adults but remains underexplored in pediatric patients. This study addresses the gap by analyzing the EASIX score's role in predicting transplant complications and mortality in children.

Data Highlights

The EASIX score was calculated daily from admission to day +35 post-transplant in pediatric patients undergoing allo-HSCT. SOS/VOD diagnosis and grading followed EBMT pediatric criteria, and NRM was defined as death from transplant-related causes without relapse. Statistical analyses included logistic regression, ROC curve analysis, and Kaplan–Meier survival estimates to evaluate the predictive performance of the EASIX score for SOS and NRM.

Key Findings

• The EASIX score, based on LDH, serum creatinine, and platelet count, effectively reflects endothelial dysfunction in pediatric allo-HSCT patients.
• Higher EASIX scores correlated with increased risk and severity of SOS/VOD post-transplant.
• The score demonstrated predictive accuracy for nonrelapse mortality, with ROC analysis identifying optimal cut-off values for risk stratification.
• Unlike prior pediatric studies, this analysis accounted for confounding factors such as age and conditioning intensity, enhancing the validity of the EASIX score in children.
• Dynamic monitoring of EASIX scores during the transplant course provided insights into endothelial injury progression and potential early intervention points.

Clinical Implications

Routine calculation of the EASIX score in pediatric allo-HSCT patients can aid clinicians in early identification of those at high risk for SOS/VOD and NRM. This enables timely preventive or therapeutic interventions, potentially improving transplant outcomes. Incorporating EASIX monitoring into standard post-transplant care protocols may enhance risk assessment and patient management.

Conclusion

The EASIX score is a valuable, accessible biomarker for predicting endothelial injury-related complications and mortality in pediatric allo-HSCT recipients. Its integration into clinical practice may improve prognostication and guide management strategies to reduce transplant-associated morbidity and mortality.

References

1. Luft et al. 2020 -- Predictive value of EASIX score in pediatric allo-HSCT
2. Bacigalupo et al. -- Conditioning regimen intensity classification
3. EBMT 2020 -- Pediatric SOS/VOD diagnostic and grading criteria
4. Glucksberg et al. -- aGvHD grading classification
5. World Health Organization -- Oral mucositis grading criteria