Metabolic syndrome as a late effect of childhood hematopoietic stem cell transplantation – A thorough statistical evaluation of putative risk factors
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Background: Metabolic syndrome (MetS) is frequent among survivors of childhood hematopoietic stem-cell transplantation (HSCT), but assessment of risk factors is challenged by survivor and participation bias in long-term follow-up studies. Methods: A cohort of 395 pediatric patients transplanted between 1980 and 2018 was investigated. MetS was assessed at follow-up between December 2018 and March 2020. Two composite outcomes ((a) combining MetS and death, (b) combining MetS, death, and nonparticipation) were considered to address the risk of selection bias. Results: Among 234 survivors invited to the follow-up, 96 individuals (median age 27 years) participated. MetS prevalence was 30% among participants. The only significant HSCT risk factor was a variable combining HSCT indication and conditioning with total-body irradiation (TBI) (p =.0011). Compared to acute leukemias (AL) treated with high-grade TBI (8–12 Gy), a lower MetS prevalence was seen for nonmalignant diseases treated with no/low-grade TBI (0–4.5 Gy) (OR = 0.04, 95% confidence interval (CI): 0.00–0.23). Analyses of the composite outcomes indicated overestimation of the effect of high-grade TBI due to selection bias. Scrutiny showed strong residual confounding between HSCT indication and high-grade TBI within AL-patients. The HSCT effect on MetS reflected HSCT effects on high-density-lipoprotein (HDL) and triglycerides. Compared to AL treated with high-grade TBI, nonmalignant diagnoses treated with no/low-grade TBI had higher HDL (+40%, 95% CI: +21% to +62%) and lower triglyceride (−59%, 95% CI: −71% to −42%). Conclusion: The TBI effect on MetS may be overestimated in follow-up studies due to selection bias and confounding. The TBI effect was confined to the potentially modifiable MetS criteria HDL and triglyceride.
Originalsprog | Engelsk |
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Artikelnummer | e14530 |
Tidsskrift | Pediatric Transplantation |
Vol/bind | 27 |
Udgave nummer | 4 |
Antal sider | 14 |
ISSN | 1397-3142 |
DOI | |
Status | Udgivet - 2023 |
Bibliografisk note
Funding Information:
This work was supported by the Danish Childhood Cancer Foundation (2018‐3708).
Publisher Copyright:
© 2023 The Authors. Pediatric Transplantation published by Wiley Periodicals LLC.
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