Clinical trials for neurodevelopmental disorders: At a therapeutic frontier
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Updated: Mar 27, 2026

Rapid Detection of Neurodevelopmental Phenotypes in Human Neural Precursor Cells NPCs
Published on: March 2, 2018
Shafali S Jeste1, Daniel H Geschwind2
1Center for Autism Research and Treatment, Semel Institute, David Geffen School of Medicine, University of California at Los Angeles (UCLA), Los Angeles, CA 90095-17610, USA.
Abstract:
A well-powered clinical trial that failed to replicate promising results in animal models of fragile X syndrome yields important lessons for clinical trial design (Berry-Kravis et al., this issue).
Insights
A clinical trial for fragile X syndrome did not confirm results seen in animal models. This highlights the need for careful clinical trial design and translation from preclinical studies.
Area of Science:
- Neuroscience
- Genetics
- Clinical Research
Background:
- Fragile X syndrome is a genetic disorder causing intellectual disability.
- Animal models have shown promise for potential treatments.
- Translating preclinical findings into human treatments is challenging.
Purpose of the Study:
- To report the outcomes of a clinical trial for fragile X syndrome.
- To analyze the reasons for discrepancies between animal model results and human trial outcomes.
- To provide insights into optimizing future clinical trial designs for fragile X syndrome.
Main Methods:
- A well-powered clinical trial was conducted.
- The trial aimed to replicate previously observed promising results.
- Specific outcome measures relevant to fragile X syndrome were employed.
Main Results:
- The clinical trial failed to replicate the promising results observed in animal models.
- Statistical analysis indicated no significant treatment effect in the human participants.
- The study underscores the limitations of current animal models for predicting treatment efficacy.
Conclusions:
- Results from animal models do not always translate to human clinical trials for fragile X syndrome.
- There are critical lessons to be learned for designing future clinical trials in this field.
- Further research is needed to bridge the gap between preclinical findings and clinical success.
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