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Hematopoietic Stem Cell Transplantation – Overview

Hematopoietic stem cell transplantation is a procedure in which diseased blood stem cells are replaced with healthy ones. It is used to treat serious blood and bone marrow disorders.

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Things worth knowing about "Hematopoietic Stem Cell Transplantation"

Hematopoietic stem cell transplantation is a procedure in which diseased blood stem cells are replaced with healthy ones. It is used to treat serious blood and bone marrow disorders.

What Is Hematopoietic Stem Cell Transplantation?

Hematopoietic stem cell transplantation (HSCT), also known as blood stem cell transplantation, is a medical procedure in which damaged or diseased blood-forming stem cells are replaced with healthy ones. Blood stem cells are specialized cells found in the bone marrow that produce all types of blood cells – red blood cells, white blood cells, and platelets. When this system is compromised by disease or aggressive medical treatment, a transplant can restore normal blood cell production.

Types of Hematopoietic Stem Cell Transplantation

There are two main types of stem cell transplantation:

Autologous transplantation: The patient's own stem cells are collected, frozen, and reinfused after high-dose therapy. This approach protects the blood-forming system from the effects of intensive treatment such as chemotherapy.
Allogeneic transplantation: Stem cells are donated by a compatible donor – either a family member or an unrelated donor found through a stem cell registry. While this approach carries greater risks, it also offers the potential for a graft-versus-leukemia effect, in which the donor cells actively attack remaining cancer cells.

Indications – When Is It Used?

Hematopoietic stem cell transplantation is used to treat a range of serious blood and immune system disorders, including:

Leukemias (e.g., acute myeloid leukemia, acute lymphoblastic leukemia)
Lymphomas (e.g., Hodgkin lymphoma, non-Hodgkin lymphoma)
Multiple myeloma
Aplastic anemia (severe failure of blood cell production)
Myelodysplastic syndromes (MDS)
Certain inherited immune deficiencies and metabolic disorders

The Transplantation Process

1. Preparation (Conditioning)

Before the transplant, the patient undergoes a conditioning regimen, which typically involves high-dose chemotherapy and sometimes total body irradiation. This step destroys diseased cells and suppresses the immune system sufficiently to prevent rejection of the new stem cells.

2. Stem Cell Collection

Stem cells can be collected in several ways:

From peripheral blood: Growth factors are administered to stimulate the release of stem cells from the bone marrow into the bloodstream, where they are collected through a process called apheresis.
From bone marrow: Stem cells are harvested directly from the pelvic bone under general anesthesia.
From umbilical cord blood: Cord blood collected at birth is rich in stem cells and can be stored for future use.

3. Infusion of Stem Cells

The collected stem cells are infused into the recipient through an intravenous line, similar to a blood transfusion. The stem cells travel through the bloodstream to the bone marrow, where they begin producing new blood cells. This process is called engraftment and typically takes two to four weeks.

4. Recovery and Follow-Up Care

Following transplantation, patients typically spend several weeks in a specialized hospital unit under close observation. The immune system is significantly weakened during this period, resulting in a high risk of infections. Regular blood tests, preventive medications, and careful hygiene practices are essential during recovery.

Risks and Possible Complications

Hematopoietic stem cell transplantation is a complex procedure with serious potential risks:

Graft-versus-host disease (GvHD): In allogeneic transplants, donor immune cells may recognize the recipient's tissues as foreign and attack them. GvHD can affect the skin, liver, gastrointestinal tract, and other organs.
Infections: The period of immune suppression significantly increases the risk of bacterial, viral, and fungal infections.
Graft failure: In rare cases, the transplanted stem cells fail to engraft properly.
Organ damage: The conditioning therapy can place significant strain on the liver, lungs, heart, and other organs.
Relapse: Despite a successful transplant, the underlying disease may return.

Outcomes and Prognosis

The success of a hematopoietic stem cell transplant depends on numerous factors, including the type of underlying disease, the age and overall health of the patient, and the degree of compatibility between donor and recipient. Advances in transplantation medicine over recent decades have significantly improved outcomes. For certain conditions such as acute myeloid leukemia, allogeneic transplantation offers the best chance of long-term remission or cure.

References

European Society for Blood and Marrow Transplantation (EBMT): EBMT Handbook – Hematopoietic Stem Cell Transplantation and Cellular Therapies. 7th edition, 2019.
Niederwieser D. et al.: European Society for Blood and Marrow Transplantation recommendations for first-line treatment of acute myeloid leukemia. Bone Marrow Transplantation, 2022.
National Cancer Institute (NCI): Bone Marrow Transplantation and Peripheral Blood Stem Cell Transplantation. Available at: www.cancer.gov

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