Homology Clinical Hold on Gene Therapy Lifted

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FDA has removed a clinical hold on Homology Medicines and its pheNIX gene therapy clinical trial evaluating HMI-102 in adults with phenylketonuria (PKU). Homology says it is planning to inform clinical trial sites about changes to the protocol, which include a new steroid-sparing immunosuppression regimen that incorporates a T-cell inhibitor and a shorter course of steroids.

 

The company previously disclosed that the clinical hold on the pheNIX trial was related to elevated liver function tests observed in the trial, which it says were all resolved with no hospitalizations. Homology says its response to FDA included changes to the protocol intended to enhance risk-mitigation measures and a new immunosuppression regimen with the T-cell inhibitor tacrolimus, which will be used in combination with a reduced duration of prophylactic steroids. The same approach is being used in Homology’s ongoing pheEDIT gene editing trial for PKU and juMPStart gene therapy trial for Hunter syndrome. “Similar regimens have been shown to dampen the immune response to AAVs in the clinical setting,” it says.

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