Allogeneic Hematopoietic Stem Cell Transplantation in Pediatric and Young Adult Patients with Chronic Myeloid Leukemia in Tyrosine Kinase Inhibitor Era: A Study of the Korean Blood and Marrow Transplantation Registry
Year: 2025
Type: article
Study design: Observational Study
Abstract: PURPOSE: Chronic myeloid leukemia (CML) in children, adolescents, and young adults is rare and differs from older adults. This study evaluated the outcomes of allogeneic hematopoietic stem cell transplantation (HSCT) in young Korean CML patients during the tyrosine kinase inhibitor (TKI) era. MATERIALS AND METHODS: A retrospective analysis of 35 CML patients aged < 40 years who underwent allogeneic HSCT from 2009 to 2019 was conducted using Korean Blood and Marrow Transplantation Registry data. Patients were grouped by age < 20 years at HSCT (group 1, n=15) and 20-40 years at HSCT (group 2, n=20). Survival outcomes including overall survival (OS), relapse-free survival (RFS), and event-free survival (EFS) were analyzed using the Kaplan-Meier method. RESULTS: The median time between diagnosis and HSCT was 8.9 months. All the patients achieved engraftment but platelet recovery was significantly slower in group 1 (p=0.034). Acute and chronic graft-versus-host disease occurred in 54.3% and 34.3%, respectively. Five-year OS, RFS, and EFS rates of total patients were 66.8%, 50.8%, and 47.6%, with better OS was observed in group 1 by multivariable analysis (p=0.048). Disease status at HSCT was a significant predictor of OS (p=0.028), RFS (p=0.003), and EFS (p=0.004). Disease progression occurred in 13 out of 35 patients (37.1%); treatment-related mortality accounted for 63.6% of deaths (7 out of 11). CONCLUSION: When performed at a younger age, allogeneic HSCT result in superior outcome in CML. Achieving remission before HSCT is critical for improved outcomes, highlighting the importance of pretransplant remission via optimal TKI strategies and minimal residual disease monitoring.
Source: Cancer Research and Treatment
Authors: Hee Young Ju, Hyoung Soo Choi, Hyeon Jin Park, Keon Hee Yoo, Chuhl Joo Lyu, Ho Joon Im, Min Kyoung Kim, Yeung-Chul Mun, Joon Ho Moon, Sung-Soo Yoon, Eunyoung Lee, Jae Hoon Lee, Je-Hwan Lee, So Young Chong, June-Won Cheong, Seunghyun Won, on behalf of the Korean Society of Blood and Marrow Transplantation
Institutions: Samsung Medical Center, Sungkyunkwan University, Seoul National University, Seoul National University Bundang Hospital, National Cancer Center, Yonsei University, Yonsei University Health System, Asan Medical Center, University of Ulsan, Yeungnam University College, Yeungnam University, Ewha Womans University, Ewha Womans University Seoul Hospital, Kyungpook National University Hospital, Kyungpook National University, Kyungpook National University Medical Center, Seoul National University Hospital, Gachon University Gil Medical Center, CHA University Bundang Medical Center, CHA University
Language: English
Subfield: Hematology
Field: Medicine
Domain: Health Sciences
Open Access status: diamond
OpenAlex ID: W4410113592