Bone Marrow Transplant

A bone marrow transplant (BMT) is an advanced treatment that replaces damaged or destroyed blood-forming stem cells with healthy stem cells. It may be recommended for certain blood cancers, blood disorders and selected immune-related conditions when a transplant is considered an appropriate part of treatment.

Blood-forming stem cells produce red blood cells, white blood cells and platelets. Depending on the condition and treatment plan, healthy stem cells may come from the patient or from a suitable donor. The procedure is also commonly referred to as a stem cell transplant or hematopoietic stem cell transplant.

Conditions That May Require a Bone Marrow Transplant

A bone marrow transplant may be considered in the treatment of conditions affecting the blood, bone marrow or immune system. These can include:

• Acute lymphoblastic leukemia (ALL)
• Acute myeloid leukemia (AML)
• Certain types of lymphoma
• Multiple myeloma
• Myelodysplastic syndromes
• Aplastic anemia
• Sickle cell disease
• Thalassemia
• Selected immune or other blood disorders

Whether a transplant is appropriate depends on the specific diagnosis, disease status, previous treatments, overall health, availability of a suitable donor and other clinical factors.

Types of Bone Marrow and Stem Cell Transplants

Autologous Stem Cell Transplant

In an autologous stem cell transplant, the patient's own healthy stem cells are collected and stored before intensive treatment. They are then returned to the bloodstream after conditioning therapy. This approach is used for selected conditions where the patient's own stem cells are suitable for transplantation.

Allogeneic Stem Cell Transplant

An allogeneic bone marrow transplant uses healthy stem cells from another person. The donor may be a related or unrelated individual whose tissue type is sufficiently compatible with the recipient. Close matching is important because the recipient's immune system and the donated cells need to interact safely.

Syngeneic Transplant

A syngeneic transplant uses blood-forming stem cells from an identical twin. This is a less common form of stem cell transplantation.

How Bone Marrow Transplantation Works

The bone marrow transplant process generally involves several stages. First, the medical team performs detailed assessments to determine whether transplantation is appropriate. Tests may include blood investigations, heart and lung assessments, imaging and, when clinically indicated, a bone marrow examination.

The patient may then receive conditioning therapy, usually involving high-dose chemotherapy and sometimes radiation therapy. This prepares the body for the transplant by treating abnormal cells and making space for the new blood-forming stem cells.

The stem cells are subsequently infused through an intravenous line or central venous catheter. The infusion is similar to receiving a blood transfusion and does not normally require surgery or general anesthesia.

After transplantation, the healthcare team closely monitors blood counts, infections, organ function and the development of new blood cells as the transplanted stem cells begin to establish themselves in the bone marrow.

Stem Cell Collection and Donor Matching

Stem cells can be collected from the bloodstream, bone marrow or, in selected circumstances, umbilical cord blood. For blood stem cell collection, a process called apheresis separates stem cells from the blood while returning the remaining blood components to the donor.

For an allogeneic transplant, donor compatibility is assessed using human leukocyte antigen (HLA) testing. A suitable donor may be a family member or an unrelated donor, depending on availability and compatibility.

Risks and Possible Side Effects

A bone marrow transplant is a complex treatment, and the possible risks vary according to the type of transplant, underlying condition, conditioning treatment and overall health.

Potential short-term effects can include:

• Increased risk of infection
• Fatigue and weakness
• Nausea or vomiting
• Loss of appetite
• Mouth sores
• Hair loss
• Bleeding or low blood cell counts

Longer-term complications can also occur in some patients. These may include organ-related complications, fertility problems and other treatment-related effects. Patients receiving an allogeneic transplant may also develop graft-versus-host disease (GVHD), in which donor immune cells attack healthy tissues in the recipient.

The transplant team discusses individual risks and expected benefits before treatment because the suitability and risk profile of transplantation differ from patient to patient.

Preparation Before a Bone Marrow Transplant

Preparing for a stem cell transplant involves medical evaluation as well as practical and emotional preparation. Patients may undergo blood tests, heart and lung assessments, imaging and other investigations to determine whether they are fit for transplantation.

Doctors may also discuss nutrition, infection prevention, medications, fertility considerations, donor matching and arrangements for follow-up care. Following the transplant team's instructions before treatment can help patients prepare for the demanding recovery period.

Recovery After Bone Marrow Transplant

Recovery after a bone marrow transplant takes time and varies considerably between individuals. Patients generally require close monitoring after transplantation because the immune system and blood counts may remain suppressed while the new stem cells establish themselves.

Regular follow-up appointments are important after discharge. Depending on the transplant type and individual circumstances, patients may require medicines to prevent infections, immune-suppressing medicines, blood or platelet transfusions and repeated laboratory investigations.

The immune system may take months to recover fully, particularly following an allogeneic transplant. Patients should follow their transplant team's advice regarding diet, physical activity, infection prevention, travel and daily activities during recovery.

Is Bone Marrow Transplant Right for Everyone?

Not every patient with a blood cancer or blood disorder requires a transplant. The decision depends on several factors, including the underlying disease, disease stage or status, previous treatments, overall health, ability to tolerate intensive therapy and whether an appropriate donor is available when donor cells are required.

A hematologist or transplant specialist evaluates these factors and discusses the potential benefits, risks and alternative treatment options before recommending transplantation.

Frequently Asked Questions About Bone Marrow Transplant

Is a bone marrow transplant the same as a stem cell transplant?

The terms are often used interchangeably, but stem cells used for transplantation can be collected from the bloodstream, bone marrow or cord blood. When the cells are specifically collected from bone marrow, the procedure is called a bone marrow transplant.

Is bone marrow transplant a surgery?

The actual infusion of stem cells is generally not a surgical procedure. The cells are given through an intravenous line or catheter, similar to a blood transfusion. Bone marrow harvesting from a donor is a separate procedure and is performed under anesthesia.

How long does recovery take after a bone marrow transplant?

Recovery varies by patient and transplant type. Blood counts may recover before the immune system is fully restored, and complete recovery can take many months. Some patients may require close medical follow-up for a prolonged period after transplantation.

What is the difference between autologous and allogeneic transplant?

An autologous transplant uses the patient's own collected stem cells, while an allogeneic transplant uses stem cells from a suitable donor. The choice depends on the disease, treatment strategy and individual patient factors.

What is the cost of a bone marrow transplant?

The cost of bone marrow transplant varies significantly depending on the type of transplant, underlying disease, conditioning treatment, donor requirements, hospital stay, medicines, investigations and management of complications. Patients should obtain a personalized estimate from the treating hospital rather than relying on a general online figure.

Patient-Centred Bone Marrow Transplant Care

Bone marrow transplantation requires coordinated care before, during and after the procedure. A multidisciplinary transplant team can help patients understand their treatment plan, prepare for transplantation, manage potential complications and monitor recovery.

If you or a family member has been advised to consider bone marrow transplantation or stem cell transplant, discuss the diagnosis, treatment alternatives, donor requirements, expected benefits and potential risks with a qualified hematologist or transplant specialist.