TB Alliance launches three-drug combination trial for drug-sensitive and multidrug-resistant TB

Global Alliance for TB Drug DevelopmentNov 8 2010

In advance of the 41^st Union World Conference, the Global Alliance for TB Drug Development (TB Alliance) today announced the launch of the first clinical trial to test a novel tuberculosis regimen in a new development paradigm designed to speed new treatments to patients. This novel three-drug combination shows promise to treat both drug-sensitive (DS-TB) and multidrug-resistant TB (MDR-TB), and alter the course of the TB pandemic by shortening and simplifying treatment worldwide.

“We need more than a new drug to eradicate TB—we need entirely new regimens of TB drugs”

This Phase II trial, called NC001 or New Combination 1, tests the new TB drug candidates PA-824 and moxifloxacin in combination with pyrazinamide, an existing antibiotic commonly used in TB treatment today. Based on pre-clinical data, the combination shows potential to shorten treatment time for virtually all tuberculosis patients and harmonize the treatment of DS-TB and MDR-TB treatment with a single three-drug regimen. This is a particularly significant advance for MDR-TB patients, who today must take multiple types of drugs, including injectables, daily for up to two years. If successful, the experimental regimen will offer a shorter, simpler, safer, and more affordable treatment option for MDR-TB, an emerging global health threat. Both new compounds are being developed by the nonprofit organization TB Alliance, one (moxifloxacin) in partnership with Bayer HealthCare AG.

"We need more than a new drug to eradicate TB—we need entirely new regimens of TB drugs," said Mel Spigelman, M.D., President and Chief Executive Officer, TB Alliance. "The potential to offer a single regimen to treat both drug-sensitive and multi drug-resistant TB represents a monumental advance in the treatment of patients worldwide, and a tremendous step toward simplifying the delivery of TB treatment globally."

Treating active TB requires a combination of drugs to prevent the development of drug resistance. Traditionally, researchers tested one new drug at a time in a series of lengthy and expensive clinical trials, meaning it would take decades to develop a completely novel drug combination. This new approach to drug development enables combinations of previously unregistered TB drugs to be tested together, with the goal of introducing truly innovative regimens in only a fraction of that time.

This research approach is being championed by the Critical Path to TB Drug Regimens (www.CPTRInitiative.org), an initiative established to tackle the regulatory and other challenges associated with TB drug development. CPTR was founded in March 2010 by the Bill & Melinda Gates Foundation, the Critical Path Institute, and the TB Alliance. Nearly a dozen pharmaceutical companies, civil society organizations, the European and Developing Countries Clinical Trials Partnership (EDCTP), and others have signed on to the initiative's guiding principles. The US Food and Drug Administration, other regulatory bodies, and the World Health Organization have all shown support for this initiative.

The trial involves 68 participants at two centers in South Africa, each receiving two weeks of treatment and three months of follow-up to evaluate effectiveness, safety, and tolerability. NC001 is an early bactericidal activity trial and is supported financially by United States Agency for International Development, the Bill & Melinda Gates Foundation, and the United Kingdom's Department for International Development.

There is a desperate need for new and better TB treatments to address today's growing pandemic, which kills nearly 2 million people each year. There have been no new TB drugs for nearly 50 years and, until the past decade, no pipeline of TB drug candidates. Now, with increased investments in TB R&D, there are 9 promising TB compounds in the pipeline from six antibiotic classes, making combination testing of new TB drugs possible.

"New and powerful drugs to combat TB and MDR-TB are essential to achieving TB control goals outlined in the Global Plan to Stop TB 2011-2015 and ultimately to eliminate TB," said Mario Raviglione, M.D., Director of the World Health Organization's Stop TB Department. "It is extremely encouraging to see a growing pipeline of TB drug candidates that may revolutionize TB care and committed sponsors moving with speed and efficiency towards new regimens."

NC001 also tests additional two-drug combinations (TMC207/pyrazinamide and PA-824/pyrazinamide) that may prove to be the building blocks of future regimens. Regimen development may become the new gold standard in TB research and offer lessons for other diseases requiring combination treatment, such as cancer, hepatitis C, and malaria. However, there remains a vital need for funding to bring new TB regimens through late-stage clinical trials.

"We desperately need more funding and creative approaches to impact the global pandemic," reported Joanne Carter, Executive Director, RESULTS Educational Fund. "Support for research and development of new TB regimens is critical to reducing the impact of this disease and helping to eliminate one of the major health causes of entrenched poverty."