How long does a stem cell transplant take?

A few months from start to finish, though the infusion itself takes only 1 to 5 hours. The long part is what comes before and after it.

Full immune recovery takes longer still. The National Cancer Institute puts it at several months after an autologous transplant, where the cells come from you. For an allogeneic transplant, where cells come from a donor, or a syngeneic one from an identical twin, it takes 1 to 2 years.

The timeline, phase by phase

The process starts with conditioning: very high doses of chemotherapy, sometimes with radiation therapy. That runs for a week or two. Its purpose is to destroy cancer cells, and it destroys your blood-forming stem cells along the way. That is why the transplant is needed at all.

Then you get a few days to rest.

Next comes the transplant. The day you receive the cells is called day zero. The stem cells go in through an intravenous catheter, much like a blood transfusion, and take 1 to 5 hours to run in.

After day zero: waiting for counts to climb

Recovery starts the moment the infusion ends. New stem cells travel to your bone marrow and begin producing white cells, red cells, and platelets again. Your team checks your blood counts often to watch that happen.

This gap is the dangerous stretch. Until white cells return you have little defense against infection, and until platelets return you bruise and bleed easily. Expect transfusions of blood or platelets during this period.

Call your transplant team immediately for a fever of 100.4 °F (38 °C) or higher, chills, new bleeding or bruising, black or bloody stools, or shortness of breath. MedlinePlus advises not taking acetaminophen, aspirin, ibuprofen, naproxen, or any other fever-reducing medicine without checking with your provider first, since it can mask the fever your team needs to see. Infection during this window is a medical emergency, not something to sleep on.

Why the calendar keeps running after you go home

The 100-day mark is a real milestone. If you have no problems, you can go home 100 days after receiving donor stem cells. Until then, many people stay in a hotel or apartment near the transplant center rather than at home, because they are in and out of the hospital.

After discharge you will still be visiting the hospital two or three times a week, sometimes for a few hours at a time, for transfusions or to replace minerals. You will be more tired than you expect, and concentration often suffers.

For allogeneic transplants there is a second clock. Graft-versus-host disease happens when the donor's white cells treat your body as foreign and attack your skin, liver, intestines, and other organs. The acute form appears within the first 3 months. The chronic form begins at 3 months or later. It is treated with steroids or other drugs that suppress the immune system, and its risk is lowered by a closer donor match, immune-suppressing drugs, or removing T cells from the donated stem cells before the infusion.

Planning around the length

Because this takes months, plan for it as months. Work is the obvious pressure. If your job allows it, arrangements to work remotely and part-time often fit better than a clean return. Many employers are legally required to adjust your work schedule during cancer treatment, and a social worker can explain those laws for your situation.

Money is the other pressure. Transplants are expensive, need long stays at specialized centers, and often add costs for travel, housing, and childcare. Most insurance plans cover some of the cost for certain cancers. Ask the treatment center's business office to lay out the full picture before you start, and call NCI's Cancer Information Service at 1-800-4-CANCER for groups that may help.

Sources

https://www.cancer.gov/about-cancer/treatment/types/stem-cell-transplant

https://www.cdc.gov/cancer-preventing-infections/patients/fever.html

https://medlineplus.gov/ency/patientinstructions/000913.htm