Clementia initiates Phase 2 extension study of palovarotene in FOP patients

Clementia Pharmaceuticals, Inc. announced today the initiation of a Phase 2 extension study of palovarotene in patients with fibrodysplasia ossificans progressiva (FOP), a rare, severely disabling genetic disease characterized by painful, recurrent episodes of soft tissue swelling (flare-ups) and new abnormal bone formation. This process, known as heterotopic ossification (HO), occurs in muscles, tendons and ligaments, causing significant morbidities and progressive disability.

The multi-center, open-label extension study is open only to patients who complete Clementia's 12-week, randomized, double-blind, placebo-controlled, Phase 2 study of palovarotene, an investigational retinoic acid receptor gamma agonist, in FOP. The extension study is designed to evaluate the long-term safety and efficacy of palovarotene treatment in FOP patients. There is no placebo arm in the extension study, and all patients will be treated with palovarotene. 

"Continuity of care is a high priority for patients with FOP because the disease is progressive and debilitating, with unpredictable flare-ups," said Edward Hsiao, M.D., Ph.D., Assistant Professor at University of California San Francisco (UCSF) School of Medicine and one of the principal investigators in the extension study. "The extension trial provides access to palovarotene if patients experience flare-ups over the ensuing 12 months."

"Providing continued access to palovarotene through this extension study is important for those patients who agreed to participate in the previous trial, which included the possibility of receiving either placebo or palovarotene treatment at the time of a flare-up," commented Donna Grogan, MD, Chief Medical Officer of Clementia. "We are focused on understanding the role of palovarotene as a potential treatment for FOP, and on understanding the long-term effects of treatment. This study will advance our knowledge base in this area."

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