Bone marrow stem cell transplantation in children
Hematopoietic stem cell transplantation (bone marrow transplantation) is a medical procedure in which a child’s diseased bone marrow is replaced with healthy stem cells. These cells may be obtained from a donor or from the patient themself, depending on the type of transplantation. This method is used to treat a wide range of conditions, including leukemias, lymphomas, aplastic anemia, and certain genetic and immune disorders.
Types of stem cell transplantation
- Autologous transplantation. Stem cells are collected from the child, cryopreserved, and later reinfused after the bone marrow has been destroyed by high-dose chemotherapy or radiation therapy. This approach is used when the risk of relapse is relatively low and the patient’s own cells are free of malignant contamination.
- Allogeneic transplantation. Stem cells are obtained from a donor (related or unrelated) who is tissue-compatible with the child. This is the most common type of transplantation for children with leukemia and other severe hematologic diseases. The donor may be a sibling or an unrelated donor identified through an international registry.
- Haploidentical transplantation. The donor is a parent or another close relative whose tissues are only partially compatible with the child’s. This option is used when a fully matched donor cannot be found.
Indications for stem cell transplantation in Belarus
- Oncological diseases. Acute lymphoblastic leukemia (ALL), acute myeloid leukemia (AML), and other blood cancers when standard chemotherapy is ineffective or when there is a high risk of relapse.
- Hematological disorders. Aplastic anemia, severe forms of sickle cell disease, thalassemia, and myelodysplastic syndromes.
- Immunodeficiency disorders. Severe combined immunodeficiency (SCID) and other primary immune system defects.
- Genetic diseases. Certain inherited metabolic disorders, such as Gaucher disease and Hunter syndrome.
Preparation for transplantation
- Pre-transplant evaluation. A comprehensive assessment is performed, including blood tests, evaluation of cardiac, pulmonary, and renal function, as well as detailed immunological testing.
- HLA compatibility testing. For allogeneic transplantation, a compatible donor is selected based on human leukocyte antigen (HLA) typing. The higher the degree of HLA match, the lower the risk of complications.
- Conditioning therapy. Before transplantation, the child receives high-dose chemotherapy and/or radiation therapy. This regimen destroys the diseased bone marrow and suppresses the immune system to prevent rejection of the transplanted cells.
How is the transplantation procedure performed?
- Infusion of stem cells. Stem cells are administered intravenously, similarly to a blood transfusion. They migrate to the bone marrow and begin producing new, healthy blood cells. The process of cell engraftment may take several weeks.
- Recovery period. During this phase, the child remains in a protected (sterile) environment to reduce the risk of infection. The immune system is severely weakened, and supportive care may include blood transfusions, antibiotics, and other medications.
Recovery after transplantation
- Hospitalization. After transplantation, the child may remain hospitalized for several weeks to several months. Physicians closely monitor blood counts, signs of infection, and organ function.
- Immune reconstitution. Recovery of the immune system can take several months to a year. Some children require revaccination to restore protection against infectious diseases.
- Diet and lifestyle. A strict diet is recommended, with avoidance of raw foods, and contact should be limited to screened individuals to minimize infection risk.
- Psychological support. Treatment of cancer or severe chronic disease can be emotionally challenging for both the child and the family. Psychologists and social workers provide essential support during recovery.
Long-term follow-up
- Regular medical follow-up. Ongoing visits are required to assess overall health and immune system function.
- Monitoring for complications. Long-term surveillance is necessary to detect potential complications such as growth delay, endocrine disorders, organ dysfunction, or secondary malignancies.
- Physical and educational rehabilitation. Some children need physiotherapy and educational support to fully reintegrate into daily life.
Factors influencing treatment success
- Donor compatibility. A higher degree of HLA matching between donor and recipient significantly increases the likelihood of successful transplantation.
- Age of the child. Younger age is generally associated with better recovery and outcomes.
- Pre-transplant health status. The better the child’s overall condition before transplantation, the higher the chance of successful recovery.
- Underlying disease. Prognosis depends on the condition being treated, as some diseases have more favorable outcomes than others.
Hematopoietic stem cell transplantation in children is a complex but life-saving procedure that offers a chance of cure for severe diseases such as leukemias and immunodeficiencies. The success of transplantation depends on multiple factors, including careful preparation, the child’s health status, and appropriate post-transplant care. Parents should be prepared for a prolonged recovery process and work closely with the medical team to achieve the best possible outcome.
This text has been translated using machine translation technology (DeepL API) and may contain inaccuracies.
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