FDA OKs Gene Therapy Trial for Heart Disease

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FDA has approved a Tenaya Therapeutics IND for the company to begin a Phase 1b trial of TN-401, an adeno-associated virus serotype 9 (AAV9)-based investigational gene therapy product candidate for the treatment of arrhythmogenic right ventricular cardiomyopathy (ARVC) caused by mutations in the plakophilin-2 (PKP2) gene.

ARVC, which is also known as arrhythmogenic cardiomyopathy, is described as a chronic, progressive, familial disease that typically affects people before age 40. Symptoms experienced are related to ventricular arrhythmias, including palpitations, lightheadedness and fainting, and those affected are at increased risk of sudden cardiac death, Tenaya says. “PKP2 mutations are the most common genetic cause of ARVC and result in a loss of key proteins needed to maintain the structural integrity and cell-to-cell signaling of heart muscle cells,” it says.

The gene therapy is designed to address the disease’s underlying cause by delivering a fully functional PKP2 gene to “restore normal PKP2 protein levels and thereby slow disease progression and reverse the course of disease after a single dose,” the company says. “The initial dose for TN-401 in the upcoming RIDGE-1 study was associated with near maximal efficacy in our preclinical studies.” It says the clinical trial will seek to enroll up to 15 adults who have been diagnosed with PKP2-associated ARVC, have an implantable cardioverter defibrillator (ICD) and have an increased risk for arrhythmias as determined during screening by premature ventricular contraction count.

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