| Summary: | Background : : Acute complications within 100 days after allogeneic hematopoietic stem cell transplantation (HSCT) can increase immediate mortality as well as the risk of chronic complications and morbidity. A comprehensive review collecting systemic complications following transplantation would be important in pediatric patients. <br />Methods : : We report a retrospective study of pediatric patients who underwent allogeneic HSCT during the 11 years (2009-2020), and their acute complications after transplantation within 100 days. A total 227 pediatric patients' (90 females, 137 males) data were collected. <br />Results : : Among the patients, 62.6% (N=142) suffered from acute graft-versus-host disease, and 118 (52.0%) patients had an acute infection. Pulmonary complications occurred in 52 (22.9%) patients followed by hepatic sinusoidal obstruction syndrome in 30 (18.1%) patients. In the study, 19 died within the first 100 days after HSCT (8.4%), and the 5-year overall survival rate of the patients was 65.4%. <br />Conclusion : : This study widens the understanding of acute toxicities of pediatric HSCT. A significant number of children still have experienced a variety of acute infectious or non-infectious complications after allogeneic HSCT that contribute to morbidity and mortality. Therefore, continuous efforts are needed to reduce them.
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