Stem cell transplant in plain language

When a doctor says “we might think about a transplant”, most people become afraid. That is natural, because a transplant is a heavy treatment. But knowing its stages lessens the fear. This article is a general explanation and does not replace the assessment of the transplant team.

What does “transplant” mean?

Bone marrow is the factory that makes blood cells. In it, blood-forming stem cells turn into three groups: red cells, white cells and platelets. In a stem cell transplant, new stem cells are given to the body so that blood-making can start again after a very strong treatment.

Sometimes, to control certain diseases, medicine and sometimes radiation must be used at high strength. This treatment destroys the stem cells too. Without stem cells the body cannot make blood, so new cells are needed. A transplant is used mostly for blood cancers, such as leukaemia, lymphoma and myeloma, and some other bone marrow diseases.

Two main types

Using your own cells (autologous). The cells are taken from you and stored, then you receive high-dose chemotherapy, and at the end your own cells are given back to you.

From a donor (allogeneic). The cells come from another person. The donor must match your tissue type. This match is measured with an HLA test. The best match is usually a sister or brother. If no one in the family is suitable, a search is made through donor registries. In this type, the donor’s white cells can also target remaining cancer cells, but they may attack your own tissues too. This complication is called graft-versus-host disease (GVHD).

The stages, step by step

• 1. Assessment. The tests and checks that are needed and, if the transplant is from a donor, finding a suitable donor.
• 2. Collecting the cells. In an autologous transplant, you have injections for a few days to raise the number of stem cells in the blood. Then a machine takes your blood, separates the cells and returns the rest of the blood to you.
• 3. Preparation. A few days of high-dose chemotherapy, sometimes with radiation. Depending on the plan, it lasts from one to ten days or more.
• 4. Infusing the cells. Usually the day after preparation ends. The cells enter the body through a thin tube in a vein of the chest or arm, like a blood transfusion. It is not painful and needs no anaesthetic.
• 5. Recovery. You stay in hospital for a while. Because your immunity is weak, you have a separate room, and everyone who comes in wears a mask, gloves and a gown. Blood counts are checked regularly and slowly rise.

Fully rebuilding the immune system takes time: a few months after an autologous transplant and one to two years after a donor transplant. Follow-up with a doctor experienced in transplants is essential.

What is difficult?

A transplant carries a risk of serious complications. The treatment team explains all of them before starting.

• Risk of infection. A fever of 38 degrees or higher after a transplant is an emergency.
• Bleeding and tiredness until the cells settle in
• Nausea, mouth sores, diarrhoea and hair loss are side effects of the preparation. Hair usually grows back.
• GVHD in a donor transplant. It is controlled with medicine, but it is sometimes serious and long-lasting.
• Effect on fertility. If you want to have children, ask before starting.
• Late complications such as problems in organs or cataracts, which is why regular follow-up is needed

Who is a transplant suitable for?

Only the treatment team decides this. It depends on the type of disease, the stage, the response to earlier treatment, age and general condition. Not everyone with a blood cancer diagnosis needs a transplant, and many patients receive other treatments. A transplant is only one of the options, and the doctor explains to you why it is being suggested.

A last point

If you or someone you love is thinking about a transplant, ask the doctor these questions:

• Why is a transplant being raised for me, and what are the other options?
• Which type of transplant, and where?
• What risks does it carry, and what part do I play in prevention?
• How long will I stay in hospital after the transplant, and what conditions apply after discharge?
• What effect does it have on my fertility?

And take a second opinion if you need one. Fear and doubt before big decisions are natural.