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Infant With Incurable Disease is First to Successfully Receive Personalized Gene Therapy Treatment

  • On May 15, 2025, medical teams from Children’s Hospital and the University of Pennsylvania successfully administered a tailored gene-editing treatment to infant KJ Muldoon, addressing his severe CPS1 deficiency.
  • KJ's rare metabolic disorder prevents ammonia removal from protein breakdown and usually requires liver transplants with high infant mortality, prompting urgent gene therapy development.
  • Researchers rapidly designed a CRISPR-based treatment targeting KJ's specific mutation, creating a bespoke therapy infused intravenously in late February and followed by two doses.
  • Following therapy, KJ now tolerates more protein intake with reduced medication needs, and Dr. Ahrens-Nicklas said the therapy was “manufactured for an individual patient.”
  • Though initial results are promising and mark a landmark in precision medicine, experts caution that long-term effects, regulatory changes, and economic challenges remain for widespread use.
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Good News Network broke the news in United States on Sunday, May 25, 2025.
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