Pfizer terminates domagrozumab (PF-06252616) clinical studies for the treatment of Duchenne muscular dystrophy

PfizerPfizer Inc. (NYSE: PFE) announced that it is terminating two ongoing clinical studies evaluating domagrozumab (PF-06252616) for the treatment of Duchenne muscular dystrophy (DMD): a Phase 2 safety and efficacy study (B5161002) and an open-label extension study (B5161004). The Phase 2 study (B5161002), did not meet its primary efficacy endpoint, which was to demonstrate a difference in the mean change from baseline in 4 Stair Climb (in seconds) following one year of treatment with domagrozumab as compared to placebo in patients with DMD. Further evaluation of the totality of evidence including secondary endpoints did not support a significant treatment effect. The decision comes after a thorough review of data available at the time of the primary analysis, which evaluated all study participants after one year of treatment, as well as those participants who were in the trial beyond one year. The studies were not terminated for safety reasons. Pfizer will continue to review the data to better understand any insights they may provide, and will share results with the scientific and patient community.

"We are disappointed by these results and while we are not progressing with the studies, the data will contribute to a greater understanding of this disease and we will evaluate the total data set to see if there is a place for this medicine in muscular diseases," said Seng Cheng, PhD, Senior Vice President and Chief Scientific Officer, Pfizer Rare Disease Research Unit. "We are extremely grateful to all those involved with this trial, especially the boys who participated, and their families."

Pfizer is continuing research in DMD and rare neuromuscular diseases, with the goal of bringing therapies to patients with unmet needs. The company’s continued partnership with advocacy associations and the community is critical to finding innovative therapies for these diseases. Pfizer has one ongoing clinical trial in DMD with a gene therapy, PF-06939926, which is an investigational, recombinant AAV9 capsid carrying a truncated or shortened version of the human dystrophin gene (mini-dystrophin) under the control of a human muscle specific promotor.(1)

About the Domagrozumab Clinical Studies(1)

The Phase 2 double-blind, placebo-controlled, multicenter clinical trial investigated the efficacy and safety of domagrozumab, administered in monthly IV doses, in 121 boys aged 6 to 15 with DMD, regardless of underlying mutation. It was designed as a two-year, placebo-controlled study (with the primary analysis after one year); all subjects used background corticosteroid therapy. The open-label extension study was designed to evaluate long-term safety and efficacy of domagrozumab.

About Duchenne Muscular Dystrophy

Duchenne muscular dystrophy (DMD) is a rare, serious, debilitating childhood genetic disease characterized by progressive muscle degeneration and weakness and significantly shortened life expectancy. It is the most common form of muscular dystrophy worldwide and primarily affects boys, with incidence of 1 in every 3500 to 5000 live male births each year.(2,3) Children with DMD typically present with signs of weakness, including late walking, trouble getting up, and difficulty running or climbing stairs, usually manifesting in early childhood between the ages of 1 and 4 years.(4) The progressive muscle degeneration leads to a loss of the ability to walk in the early teenage years, on average. Weakness of respiratory muscles ultimately leads to use of mechanical ventilatory support, and weakness in cardiac muscle involvement results in cardiomyopathy.

Pfizer Rare Disease

Rare disease includes some of the most serious of all illnesses and impacts millions of patients worldwide,(5) representing an opportunity to apply our knowledge and expertise to help make a significant impact on addressing unmet medical needs.(1) The Pfizer focus on rare disease builds on more than two decades of experience, a dedicated research unit focusing on rare disease, and a global portfolio of multiple medicines within a number of disease areas of focus, including hematology, neuromuscular, and inherited metabolic disorders.(1)

Pfizer Rare Disease combines pioneering science and deep understanding of how diseases work with insights from innovative strategic collaborations with academic researchers, patients, and other companies to deliver transformative treatments and solutions. We innovate every day leveraging our global footprint to accelerate the development and delivery of groundbreaking medicines and the hope of cures.

Working together for a healthier world ®

At Pfizer, we apply science and our global resources to bring therapies to people that extend and significantly improve their lives. We strive to set the standard for quality, safety and value in the discovery, development and manufacture of health care products. Our global portfolio includes medicines and vaccines as well as many of the world's best-known consumer health care products. Every day, Pfizer colleagues work across developed and emerging markets to advance wellness, prevention, treatments and cures that challenge the most feared diseases of our time. Consistent with our responsibility as one of the world's premier innovative biopharmaceutical companies, we collaborate with health care providers, governments and local communities to support and expand access to reliable, affordable health care around the world. For more than 150 years, we have worked to make a difference for all who rely on us.

1. Data on file. Pfizer Inc. New York, NY.
2. National Institutes of Health. National Human Genome Research Institute. Learning About Duchenne Muscular Dystrophy. Available on https://www.genome.gov/19518854/. Accessed August 21, 2018.
3. Mendell JR, Shilling C, Leslie ND, Flanigan KM, al-Dahhak R, Gastier-Foster J, et al. Evidence-based path to newborn screening for Duchenne muscular dystrophy. Annals of Neurology. 2012;71(3):304-13.
4. NIH. Duchenne muscular dystrophy. https://rarediseases.info.nih.gov/diseases/6291/duchenne-muscular-dystrophy. Accessed August 21, 2018.
5. Pfizer Inc. Rare disease. http://www.pfizer.com/health-and-wellness/health-topics/rare-diseases/areas-of-focus. Accessed August 9, 2018.

Most Popular Now

Bayer, Brigham and Women’s Hospital, and Massachus…

Bayer and Partners HealthCare's founding members Brigham and Women's Hospital (BWH) and Massachusetts General Hospital (MGH) today announced the launch of a joint lab to ...

AstraZeneca divests rights for Losec to Cheplaphar…

AstraZeneca has agreed to sell the global commercial rights, excluding China, Japan, the US and Mexico, for Losec (omeprazole) and associated brands to Cheplapharm Arznei...

Cause of antibiotic resistance identified

Scientists have confirmed for the first time that bacteria can change form to avoid being detected by antibiotics in the human body. Studying samples from elderly patient...

Amgen announces positive results from two Phase 3 …

Amgen (NASDAQ:AMGN) today announced that the results of a prespecified interim analysis of an open-label, randomized, controlled global multicenter Phase 3 trial (2012021...

Brilinta monotherapy in high-bleeding risk patient…

New data from TWILIGHT, a Phase IV independent trial (funded by AstraZeneca), showed that in patients at high-bleeding risk who underwent PCI and completed 3 months of du...

Novartis and Microsoft announce collaboration to t…

Novartis announced an important step in reimagining medicine by founding the Novartis AI innovation lab and by selecting Microsoft as its strategic AI and data-science pa...

Ian Read to retire as Executive Chairman of Pfizer…

Following its regularly scheduled meeting, the Board of Directors of Pfizer Inc. (NYSE:PFE) today announced that Executive Chairman of the Board Ian C. Read has chosen to...

Discovery of new source of cancer antigens may exp…

For more than a decade, scientist Stephen Albert Johnston and his team at Arizona State University's Biodesign Institute have pooled their energies into an often scoffed-...

Chinese activists protest the use of traditional t…

In the West, the number of people challenging scientific authority has been growing in past decades. This has, among other things, led to a decline in the support for mas...

Cheaper drug just as effective protecting heart in…

A new clinical trial conducted at The Ohio State University Wexner Medical Center found a cost-effective generic medication works just as well as a more expensive drug in...

Bayer inks deals with eleven startups under G4A Di…

Bayer announced today that the company has signed collaboration agreements with eleven digital health startups. As part of the program, Bayer will support these startup c...

Akcea and Pfizer Inc. announce licensing agreement…

Akcea Therapeutics, Inc. (NASDAQ: AKCA), a majority-owned affiliate of Ionis Pharmaceuticals, Inc. (NASDAQ: IONS) and Pfizer Inc. (NYSE:PFE), today announced that the com...