This study aims to determine whether congenital heart disease increases chronic health risks and mortality in childhood hematological tumor survivors, explore potential shared genetic factors between these conditions, identify other factors affecting long-term outcomes and quality of life, and validate any discovered genetic links through mechanistic investigations.
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Inclusion Criteria: 1. Children with hematologic malignancies diagnosed by pathology or bone marrow aspiration/biopsy at member hospitals of the Hematologic Oncology Specialty Alliance between 2010 and 2025; 2. Aged 0-17 years at diagnosis, regardless of gender; 3. Completed standard treatment for hematologic malignancies and confirmed diagnosis of congenital heart disease by cardiac ultrasound and clinical evaluation; 4. Written informed consent can be provided by the child or their legal guardian. Exclusion Criteria: 1. Presence of birth defects other than congenital heart disease; 2. Other serious cardiac conditions, malignancies, or comorbidities that may interfere with study results; 3. Inability to provide the information and data required for the study.