12 October 2018
The critical need for new medicines to combat infectious diseases that fail to respond to current medical treatment is prompting FDA to join with other federal health agencies and the biomedical research community to advance the science, regulatory policies, and reimbursement strategies to support innovation in this area.
Unfortunately, significant obstacles have curbed industry investment in developing new antimicrobials. Clinical trials are costly and complex, and efforts to develop monoclonal antibodies and peptide therapeutics, along with complex non-traditional antibiotics, pose manufacturing challenges. Financial issues raise further hurdles, as new antimicrobials need to be used sparingly to remain effective against lethal pathogens. Current payment and coverage policies for new drugs, however, encourage widespread use of the product to generate a sufficient return on investment, making it difficult for companies sponsoring research on new treatments for infectious disease to realize sufficient returns on investment.
The Pew Charitable Trusts reports that as of June 2018 only 42 new antibiotics were in clinical development to treat serious bacterial infections. Just one in five, moreover, are likely to succeed, and only a handful have potential to address serious resistance problems, such as gram-negative bacteria, which cause particularly hard-to-treat infections.
To address this crisis, FDA commissioner Scott Gottlieb announced a 2019 Strategic Approach for Combatting AMR (antimicrobial resistance) at a meeting September 14, 2018 organized by Pew. The plan includes policies and programs to encourage development of new drugs, diagnostic tests and vaccines; to promote responsible stewardship of antimicrobials in animals and humans; to improve surveillance of antimicrobial use and resistance; and to advance research for developing new tools, standards, and policies in this area.
The initiative includes a five-year plan to support antimicrobial stewardship in veterinary settings, particularly to reduce the use of antibiotics to promote animal growth. Another component involves improving surveillance of antibiotic use in humans and animals to uncover infections more quickly and to determine when antibiotics should be used or discontinued. New in-vitrodiagnostics are needed to detect disease rapidly, identify appropriate treatment, and track resistance, as are clear standards for transmitting lab test results related to antimicrobial use and resistance.
To advance regulatory science in this area, the Office of Antimicrobial Products in the Center for Drug Evaluation and Research (CDER) has requested input from stakeholders on science initiatives likely to spur development of new antimicrobial products. In June, FDA issued draft guidance to help manufacturers utilize the Limited Population Pathway for Antibacterial and Antifungal Drugs (LPAD) in developing new therapies. The program was authorized by the 21st Century Cures Act but has been challenging for both sponsors and FDA to implement.
In addition, the Center for Biologics Evaluation and Research (CBER) is promoting development of non-traditional alternatives to small-molecule drugs, including bacteriophages, live biotherapeutics, and fecal microbiota for transplant. CBER also is exploring vaccines to prevent infections caused by microbes resistant to current treatment, which ideally would reduce the risk of infections that require treatment with new antimicrobials.
Key to spurring innovation in this field is to devise new reimbursement strategies to support the development of products that would be prescribed and used on a highly limited basis. At the Pew conference, Gottlieb outlined proposals for innovative milestone payments or fees for developers of products targeted at multi-drug resistant organisms. These include a subscription-based model that charges hospitals a flat rate or licensing fees for access to a certain number of doses each year of a new antimicrobial. By creating a predictable revenue stream, this kind of “pull incentive,” Gottlieb explained, would “create natural markets for drugs targeted to rare but dangerous, multi-drug resistant pathogens that can threaten human health.”
These models, along with add-on payments for new antibacterials that meet public health needs, may be tested in pilot programs or demonstrations that involve FDA and the Centers for Medicare and Medicaid Services (CMS). Other health and research agencies may participate, such as the Gates Foundation, the Center for Medicare and Medicaid Innovation, and the Biomedical Advanced Research and Development Authority (BARDA), along with insurers and payers.
31 October 2018
Scientists from Eli Lilly and Company, the Icahn School of Medicine at Mount Sinai (New York, USA) and Sema4 (Stamford, USA) released results from a proof-of-concept study demonstrating that patient-derived cells offer a more effective approach for assessing drug response than conventional methods.
30 October 2018
Researchers at the University of California San Diego (USA) have developed an approach that uses machine learning to identify and predict which genes make infectious bacteria resistant to antibiotics. The approach was tested on strains of Mycobacterium tuberculosis – the bacteria that cause tuberculosis (TB) in humans. It identified 33 known and 24 new antibiotic resistance genes in these bacteria.
29 October 2018
The CRISPR-Cas9 gene editing system has been widely studied because of its potential therapeutic applications, but limitations in the number of locations on the genome it can target remain a major drawback. Now scientists at the Massachusetts Institute of Technology have identified a new Cas9 enzyme that they say can help CRISPR reach more gene mutations.
26 October 2018
Pfizer has followed through on its pledge to divest a hunk of its neuroscience R&D, spinning several programs into a new company called Cerevel Therapeutics backed by $350 million in venture funding. Pfizer is contributing a trio of clinical-stage drug candidates—including a Parkinson’s therapy due to start phase 3 testing next year—plus a clutch of earlier-stage programs, while Bain Capital and affiliates stumped up the initial funding.
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