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Updated: Jun 2, 2026

Long-Term Mouse Spinal Cord Organotypic Slice Culture as a Platform for Validating Cell Transplantation in Spinal Cord Injury
Published on: April 12, 2024
Target populations for first-in-human embryonic stem cell research in spinal cord injury
Frédéric Bretzner1, Frédéric Gilbert, Françoise Baylis
1Department of Anatomy and Neurobiology, Dalhousie University, Halifax, Nova Scotia B3H 3J5, Canada. frederic.bretzner@dal.ca
Abstract:
Geron recently announced that it had begun enrolling patients in the world's first-in-human clinical trial involving cells derived from human embryonic stem cells (hESCs). This trial raises important questions regarding the future of hESC-based therapies, especially in spinal cord injury (SCI) patients. We address some safety and efficacy concerns with this research, as well as the ethics of fair subject selection. We consider other populations that might be better for this research: chronic complete SCI patients for a safety trial, subacute incomplete SCI patients for an efficacy trial, and perhaps primary progressive multiple sclerosis (MS) patients for a combined safety and efficacy trial.
Insights
Geron
Area of Science:
- Regenerative medicine
- Stem cell therapy
- Neurology
Background:
- Geron initiated the first human clinical trial using human embryonic stem cells (hESCs).
- This trial focuses on hESC-derived therapies with potential applications in spinal cord injury (SCI).
Purpose of the Study:
- To address safety and efficacy concerns of hESC-based therapies in SCI.
- To discuss ethical considerations for subject selection in clinical trials.
- To propose alternative patient populations for future hESC research.
Main Methods:
- Review of current research and ethical considerations for hESC therapies.
- Analysis of potential benefits and risks for different patient groups.
- Proposal of stratified trial designs for SCI and multiple sclerosis (MS).
Main Results:
- The study highlights critical questions surrounding the safety and efficacy of hESC-derived treatments.
- Ethical considerations regarding fair subject selection are paramount.
- Specific SCI and MS patient subgroups may be better suited for initial trials.
Conclusions:
- Further investigation into safety and efficacy is required before widespread application of hESC therapies.
- Careful consideration of patient selection is essential for ethical and effective clinical trials.
- Alternative patient populations, including chronic complete SCI, subacute incomplete SCI, and primary progressive MS, warrant further research for hESC-based treatments.
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