Bone Marrow Transplant

Published with the inputs from Dr Shinto Francis Thekkudan, Chief & Senior Consultant, Haematology, Haemato-Oncology And BMT,  Baby Memorial Hospitals- Kozhikode

Bone Marrow Transplant, also known as hematopoietic stem cell transplantation (HSCT), is a treatment in which healthy blood-forming stem cells are used to restore the bone marrow and blood-forming system. It may be considered for selected patients with blood cancers, bone marrow disorders, and certain other conditions.

Depending on the patient's condition and treatment plan, the stem cells may come from the patient themselves or from a suitable donor. Bone marrow transplantation involves careful evaluation, preparation before transplantation, close monitoring during the transplant process, and follow-up after transplantation.

What is a bone marrow transplant?

Bone marrow transplant is a treatment in which healthy blood-forming stem cells are administered to a patient to restore or replace damaged or diseased blood-forming cells.

It is also known as hematopoietic stem cell transplantation (HSCT) or stem cell transplantation.

Who may need a bone marrow transplant?

Bone marrow transplantation may be considered for selected adults with conditions such as:

• Leukemia
• Lymphoma
• Multiple myeloma
• Myelodysplastic syndromes
• Bone marrow failure disorders
• Certain inherited blood disorders
• Selected immune system disorders
• Other conditions for which stem cell transplantation is considered appropriate

The suitability of transplantation depends on the patient's diagnosis, disease status, overall health, previous treatment, and other clinical factors.

What are the types of adult bone marrow transplant?

There are two broad types of stem cell transplantation:

Autologous Stem Cell Transplant

In an autologous transplant, the patient's own stem cells are collected and stored before intensive treatment. The collected stem cells are then returned to the patient.

Allogeneic Stem Cell Transplant

In an allogeneic transplant, stem cells are obtained from another person who is a suitable donor. The donor may be a sibling, family member, or unrelated donor, depending on donor availability and compatibility.

Where are the stem cells collected from?

Stem cells for transplantation can be collected from:

• Peripheral blood
• Bone marrow
• Umbilical cord blood in selected situations

The source of stem cells depends on the patient's condition and the transplantation plan.

How is a bone marrow transplant performed?

The transplant process generally involves several stages.

First, the patient undergoes a detailed medical evaluation to determine whether transplantation is appropriate. For an allogeneic transplant, donor compatibility is also assessed.

Before receiving the stem cells, the patient may undergo conditioning treatment. This generally involves chemotherapy and, in selected cases, other treatments to prepare the body for transplantation.

The stem cells are then administered through an intravenous line. They travel to the bone marrow, where they begin producing new blood cells.

What is conditioning treatment before a bone marrow transplant?

Conditioning is the treatment given before transplantation to prepare the patient's body for receiving the stem cells.

Depending on the type of transplant and the underlying disease, conditioning may involve chemotherapy and, in selected cases, other treatment approaches.

The specific conditioning regimen is selected according to the patient's individual clinical condition and transplant plan.

Is bone marrow transplantation a surgical procedure?

No. The transplantation of stem cells itself is not a conventional surgical procedure.

The stem cells are administered through an intravenous line, similar to a blood transfusion. However, the overall transplant process involves extensive preparation, monitoring, supportive care, and follow-up.

How long does a bone marrow transplant take?

The stem cell infusion itself generally does not take a long time. However, the complete transplant journey extends over a longer period because it includes pre-transplant evaluation, conditioning, transplantation, monitoring, and recovery.

The duration of hospitalisation and recovery varies between patients depending on the underlying disease, type of transplant, complications, and response to treatment.

What happens after a bone marrow transplant?

After the stem cells are infused, the patient is closely monitored while the transplanted cells establish themselves in the bone marrow and begin producing blood cells.

During this period, patients may require monitoring of blood counts, infections, organ function, and other aspects of recovery. Supportive treatment may also be provided as required.

What are the possible complications of bone marrow transplantation?

Bone marrow transplantation can be associated with complications. The risks vary depending on the patient's condition, type of transplant, conditioning treatment, and other factors.

Possible complications may include:

• Infections
• Low blood cell counts
• Bleeding
• Organ-related complications
• Graft-versus-host disease (GVHD) following an allogeneic transplant
• Other transplant-related complications

Patients are closely monitored by the transplant team to identify and manage complications.

How is a suitable donor identified?

For an allogeneic transplant, the patient and potential donor undergo compatibility testing, including human leukocyte antigen (HLA) typing.

A suitable donor may be a sibling, another family member, or an unrelated donor, depending on the patient's requirements and available donor options.

Can a family member donate stem cells?

Yes. A sibling or another family member may be considered as a stem cell donor if they are suitably compatible.

When a suitable related donor is not available, an unrelated donor may also be considered depending on the patient's condition and donor availability.

How important is infection prevention after a bone marrow transplant?

Patients may have increased vulnerability to infections during periods of immune recovery following transplantation.

The transplant team provides specific instructions regarding hygiene, food, visitors, medications, and other precautions based on the patient's individual condition.

When can a patient return to normal activities?

Recovery after bone marrow transplantation varies from person to person.

The timing of returning to work, physical activity, social activities, and other routines depends on factors such as blood count recovery, immune recovery, the underlying disease, complications, and the patient's overall health.

The transplant team provides individual guidance during follow-up.

How long does follow-up continue after a bone marrow transplant?

Long-term follow-up is an important part of stem cell transplantation.

Patients may require regular monitoring of blood counts, disease status, immune recovery, organ function, and other aspects of health. The frequency and duration of follow-up depend on the patient's diagnosis, transplant type, and recovery.

Is bone marrow transplant suitable for every patient with blood cancer?

No. Bone marrow transplantation is not appropriate for every patient with blood cancer.

The decision depends on several factors, including the type and stage of disease, response to previous treatment, overall health, transplant-related risks, and availability of an appropriate stem cell source or donor.

What is the difference between bone marrow transplant and stem cell transplant?

Both terms refer to hematopoietic stem cell transplantation. Although the term "bone marrow transplant" is widely used, stem cells can be collected from peripheral blood or other sources and then administered to the patient.

Why is multidisciplinary care important during bone marrow transplantation?

Bone marrow transplantation requires coordinated care involving specialists from different areas of healthcare.

Depending on the patient's needs, the transplant team may include hematologists, oncologists, transplant physicians, nurses, pharmacists, nutrition specialists, infectious disease specialists, and other healthcare professionals.