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Clinical holds commonly trigger immediate negative price moves as investors reassess safety risk, potential trial delays, and funding needs; duration depends on FDA safety findings and restart timeline.
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FDA placed Regenxbio's Hunter syndrome gene therapy on clinical hold after five participants showed spinal scan abnormalities, creating a regulatory setback for the program. The hold raises questions about safety signals, restart timing, and potential funding implications, likely weighing on RGNX's near-term valuation until regulators and the company provide clear updates.
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