Stem Cell Transplant Clinical Trials in the UK 2026 — Find Active Studies
Stem cell transplantation (also called bone marrow transplant) remains a curative treatment for many blood cancers and disorders. The UK has one of the most advanced transplant networks in the world, with NHS Blood and Transplant coordinating donor searches and clinical trials driving innovation in transplant techniques, conditioning regimens, and post-transplant care.
Types of Stem Cell Transplant Trials
Your own stem cells are collected, frozen, and returned after high-dose chemotherapy. Standard for relapsed lymphoma and myeloma. Trials focus on improved conditioning, maintenance therapy, and transplant timing.
Stem cells from a matched donor (sibling, unrelated donor, or haploidentical/half-matched family member). Potentially curative for leukaemia, MDS, and aplastic anaemia. Trials focus on reducing graft-versus-host disease and improving donor matching.
Lower-dose chemotherapy before transplant, making allogeneic transplant possible for older patients and those with comorbidities. Trials comparing conditioning regimens and testing new combinations.
Using a half-matched donor (usually a family member) when a fully matched donor isn't available. This has dramatically expanded donor availability. UK trials are optimising protocols.
Conditions with Transplant Trials
- Acute Myeloid Leukaemia (AML) — Allogeneic transplant can be curative; trials testing novel conditioning and post-transplant maintenance
- Acute Lymphoblastic Leukaemia (ALL) — Transplant vs CAR-T decision trials; haploidentical approaches
- Lymphoma — Autologous transplant as standard for relapsed DLBCL; trials combining with CAR-T
- Multiple Myeloma — Autologous transplant remains standard of care for fit patients; trials testing tandem transplant and maintenance
- Sickle Cell Disease — Curative allogeneic transplant; gene therapy alternatives in trials
- Haemophilia — Gene-corrected stem cell trials aiming for cure
- Autoimmune diseases — Emerging trials using stem cell transplant for severe MS, lupus, and scleroderma
The Transplant Process
Understanding what a transplant trial involves:
- Assessment (1-2 weeks) — Comprehensive tests including heart, lungs, liver, kidney function, and dental review
- Stem cell collection — For autologous: cells collected from your blood via apheresis. For allogeneic: donor cells collected or obtained from a stem cell registry
- Conditioning (1-2 weeks in hospital) — High-dose chemotherapy (and sometimes radiotherapy) to destroy diseased cells and make space for new stem cells
- Transplant day — Stem cells infused through a central line, similar to a blood transfusion. Takes 30 minutes to a few hours
- Engraftment (2-4 weeks) — Waiting for new stem cells to start producing blood cells. You'll be in hospital with a very weak immune system
- Recovery (months) — Gradual immune recovery. Regular follow-up, medications, and monitoring for complications
For allogeneic transplant: Finding a matched donor can take weeks to months. Anthony Nolan and the British Bone Marrow Registry coordinate donor searches. Haploidentical transplants have reduced the need for perfect matches.
Risks and Complications
- Graft-versus-Host Disease (GvHD) — The donor immune cells attack your tissues (allogeneic only). Can affect skin, liver, and gut. Acute GvHD occurs in the first 100 days; chronic GvHD can develop later
- Infection — Your immune system is severely weakened for months. Strict precautions, prophylactic antibiotics, antivirals, and antifungals are standard
- Relapse — The original disease can return. Post-transplant maintenance therapies (like lenalidomide for myeloma) are tested in trials
- Organ damage — High-dose conditioning can affect the liver, kidneys, and lungs. Careful monitoring throughout
- Infertility — Conditioning often causes permanent infertility. Fertility preservation (egg/sperm banking) should be discussed before transplant
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