Letters to the Editor

Allopurinol increases DNA-thioguanine nucleotides during maintenance therapy in pediatric acute lymphoblastic leukemia

Children's Cancer Centre, Queen Silvia Children's Hospital, Sahlgrenska University Hospital, Gothenburg, Sweden; Department of Pediatrics, Institute of Clinical Sciences, University of Gothenburg, Gothenburg
Department of Pediatrics and Adolescent Medicine, Oulu University Hospital, Oulu, Finland; Research Unit of Clinical Medicine, University of Oulu, Oulu
Department of Pediatrics, Halmstad County Hospital, Halmstad
Crown Princess Victoria Children’s Hospital, Linköping University, Linköping, Sweden; Division of Children's and Women's Health, Department of Biomedical and Clinical Sciences, Linköping University, Linköping
Department of Pediatrics, University of Turku, Turku, Finland; Department of Pediatrics and Adolescent Medicine, Turku University Hospital, Turku
Department of Pediatrics, Skåne University Hospital, Lund University, Lund
Department of Pediatrics and Adolescent Medicine, Rigshospitalet Copenhagen University Hospital, Copenhagen, Denmark; Medical Faculty, Institute of Clinical Medicine, University of Copenhagen, Copenhagen
The Laboratory of Pediatric Oncology (Bonkolab), University Hospital Rigshospitalet, Copenhagen
Children's Cancer Centre, Queen Silvia Children's Hospital, Sahlgrenska University Hospital, Gothenburg, Sweden; Department of Pediatrics, Institute of Clinical Sciences, University of Gothenburg, Gothenburg
Haematologica Early view Dec 4, 2025 https://doi.org/10.3324/haematol.2025.288872