Clinical Hold Lifted on Huntington’s Drug
FDA has lifted a 2022-ordered partial clinical hold on PTC Therapeutics’ PTC518 for treating Huntington’s disease based on the agency’s review of Phase 2 trial data (PIVOT-HD). The company says interim results from the study showed that at “month 12, PTC518 treatment resulted in dose-dependent lowering of mutant Huntingtin (mHTT) protein in the blood and cerebrospinal fluid (CSF) in the interim cohort of patients. In addition, favorable trends were demonstrated on several relevant HD clinical assessments including Total Motor Score (TMS) and Composite Unified Huntington's Disease Rating Scale (cUHDRS).”
"The evidence of both CNS [central nervous system] biomarker and early clinical effects at month 12 along with the continued favorable tolerability profile supports the promise of PTC518 to address the need for an effective and safe disease-modifying therapy for patients living with Huntington's disease,” the company says. “With these data in hand, we look forward to the next steps in the PTC518 development program.”
The company says small molecule PTC518 “reduces the production of the mutated Huntingtin protein that leads to injury and death of the neuron, which results in disease progression. The orally bioavailable small molecule penetrates the blood brain barrier, is selective, titratable, and not effluxed – which are key differentiation properties.”