Question 1

Which childhood conditions require a bone marrow transplant?

Accepted Answer

Bone marrow transplant is used to treat a range of serious childhood conditions, including blood cancers like leukaemia and lymphoma, bone marrow failure syndromes such as aplastic anaemia, certain inherited blood disorders like thalassaemia and sickle cell disease, and some immune deficiency and metabolic disorders. It works by replacing damaged or diseased bone marrow with healthy stem cells that can rebuild a functioning blood and immune system. Not every child with these conditions needs a transplant; your paediatric haematologist will determine if it's the right option based on disease severity and response to other treatments.

Question 2

How is a donor matched for a pediatric bone marrow transplant?

Accepted Answer

Donor matching is based on human leukocyte antigen (HLA) typing, a blood test that checks how closely a potential donor's tissue markers match the child's. Siblings have roughly a 25% chance of being a full match, making them the first choice when available. If no matching sibling is found, doctors search unrelated donor registries, cord blood banks, or consider a half-matched (haploidentical) parent donor. A closer HLA match generally reduces the risk of complications like graft-versus-host disease, so the transplant team carefully evaluates all available options before choosing the best donor.

Question 3

What are the risks of bone marrow transplant in children?

Accepted Answer

Bone marrow transplant carries significant risks because it involves suppressing the child's immune system before the transplant, leaving them highly vulnerable to infection during recovery. Other risks include graft failure, where the new cells don't take hold, graft-versus-host disease in transplants from a donor, and organ effects from the conditioning chemotherapy or radiation. Despite these risks, transplant teams use careful monitoring, preventive medications and isolation precautions to manage them, and outcomes have improved significantly with modern transplant protocols and supportive care.

Question 4

How long does recovery take after a pediatric bone marrow transplant?

Accepted Answer

Initial recovery, until blood counts start to rise (engraftment), typically takes around two to four weeks, but full recovery of the immune system can take six months to a year. During this period, children usually need frequent clinic visits, often twice weekly until day 100 after transplant, and may need to avoid crowded places to reduce infection risk. Physical strength usually starts returning within a week or two after transplant, though complete recovery is a gradual process requiring close monitoring by the transplant team.

Question 5

What precautions are needed to protect a child's immunity after BMT?

Accepted Answer

After a bone marrow transplant, a child's immune system is essentially rebuilding from scratch and is highly vulnerable to infection for several months. Precautions include strict hand hygiene for everyone around the child, avoiding crowded public places and sick contacts, wearing a mask in certain settings, and following a low-microbial diet as advised by the care team. Preventive antibiotics or antiviral medications are often prescribed. Vaccinations are typically paused and then restarted on a specific schedule once the immune system has sufficiently recovered, as guided by the transplant team.

Question 6

What is graft-versus-host disease and how is it managed in children?

Accepted Answer

Graft-versus-host disease (GVHD) occurs when immune cells from a donor's transplanted marrow recognise the child's body as foreign and attack it, most commonly affecting the skin, gut and liver. Symptoms can include rash, diarrhoea, fever and abnormal liver function. It can range from mild to severe, and doctors give preventive medications before and after transplant to reduce this risk. If GVHD does occur, it is managed with immune-suppressing medications, and the transplant team monitors closely to adjust treatment based on severity and organ involvement.

Bone marrow transplantation (BMT)