In this article
When parents start reading about stem cell therapy for autism, two phrases appear again and again: cord blood and cord tissue. They sound almost the same, and it is easy to assume they are. They are not.
This article explains the difference in plain language, what research has looked at for each, and why it matters when you talk with a medical team.
Where both come from
Both come from the umbilical cord, which connects a baby to the placenta during pregnancy. After a healthy birth, and only with the parents' consent, the cord can be donated instead of being discarded.
From that one cord, two different things can be collected:
- Cord blood, which is the blood left inside the cord and placenta.
- Cord tissue, which is the jelly like tissue of the cord itself.
Each contains different kinds of cells, and each has been studied in different ways.
Cord blood: what it contains
Cord blood contains a mix of cells, including blood forming stem cells and various immune cells. Cord blood has a long history in medicine for certain blood conditions, which is part of why researchers became curious about it for autism.
What research found
The most widely cited study is a randomized trial led by Dawson and colleagues at Duke University, published in the Journal of Pediatrics in 2020. It included 180 autistic children. Some received a cord blood infusion and some received a placebo.
On the main measures, the trial found no significant difference between the groups. Results like this help researchers sharpen their focus, and much of the newer work now looks at cord tissue cells.
Cord tissue: what it contains
Cord tissue is a source of mesenchymal stromal cells, usually shortened to MSCs. These cells are different from blood forming stem cells. Researchers are interested in MSCs mainly because of how they may interact with the immune system and inflammation.
MSCs are usually grown in a laboratory from a small amount of tissue, which means the laboratory process plays a big part in what the final product looks like.
What research has looked at
A safety study by Sun, Dawson and colleagues, published in Stem Cells Translational Medicine in 2020, gave cord tissue MSCs to 12 autistic children. The study was designed to look at safety, not to show benefit, and it helped plan later research.
A further trial using cord tissue cells has been registered on ClinicalTrials.gov under the number NCT04294290. Registration means the study design is publicly recorded, which is a sign of transparent research practice. You can look up the record yourself to see its aims and status.
A simple side by side
Here is a plain summary to keep in mind:
- Source. Cord blood is the blood in the cord. Cord tissue is the cord itself.
- Main cells. Cord blood has a mix of blood forming and immune cells. Cord tissue is a source of MSCs.
- Preparation. Cord blood is typically collected and stored. MSCs are usually grown and expanded in a laboratory.
- Research so far. A large cord blood trial found no significant difference on its main measures. Cord tissue MSCs are an active, growing focus of research.
Why researchers keep studying both
You may wonder why research continues after a large trial found no significant difference. Science often moves this way. A result tells researchers what did not change for most children under particular conditions, and that helps them ask sharper questions next time. Researchers may look at different cell types, different doses, different ages or different ways of measuring change. Some of those questions are now being explored with cord tissue cells.
For parents, the practical point is this: early studies are a starting place, not a final answer. Results from one study cannot simply be copied across to another type of cell, and promising sounding stories are not the same as evidence from careful trials.
Why the difference matters
When you speak with any provider, it is worth asking exactly which cells they use. "Stem cells" can mean several different things, and research on one type does not automatically apply to another.
It is also worth asking about the laboratory. Because MSCs are grown and prepared, quality standards matter a great deal. At MRC Healthcare, the operator of Bangkok Autism Care, cells are prepared in our own in house laboratory with ISO 9001:2015 quality management and GMP certification. We are happy to explain the process in more detail.
Questions you might ask
- Which type of cell would be used for my child, and why?
- Which published studies relate to that specific cell type?
- Where are the cells prepared and tested?
- What are researchers exploring next?
Keeping perspective
Cord blood and cord tissue cells are not a cure for autism. Research is growing, and larger trials are building on earlier work. Understanding the difference between them helps you ask clearer questions and weigh information more calmly.
Our stem cell therapy for autism page sets out the research in more detail, and our parent's guide covers how a review works from start to finish.
If you would like to talk through which approach, if any, may be suitable for your child, our medical team can review your child's reports free of charge. You can send us an enquiry whenever it feels right.
Common questions
No. Both come from donated umbilical cords, but cord blood is the blood inside the cord, while cord tissue is the cord itself and is a source of MSCs.
References
- Dawson G, et al. Journal of Pediatrics, 2020. Randomized trial of cord blood infusion in 180 autistic children. View source
- Sun JM, Dawson G, et al. Stem Cells Translational Medicine, 2020. Safety study of umbilical cord tissue cells in 12 children. View source
- ClinicalTrials.gov, study NCT04294290. View source
This article is general information, not medical advice. Every child is different. Please talk with your own medical team before making decisions about your child's care. Stem cell therapy for autism is a growing area of research and is not a cure.
