Where Are the Therapeutics to Combat COVID-19?

With two innovative vaccines beginning to provide protection against the coronavirus for Americans and people around the world, and more on the way, scientists and policy-makers are looking more sharply at the lag in identifying and producing medicines to moderate early infections and to treat seriously ill patients. And the demand for effective therapies has escalated with the emergence of new COVID-19 variants.

Much of the blame for limited progress in this area lies with the lack of collaborative, centralized research programs able to identify and collect valid data on existing and new therapies. Instead, hundreds of researchers and clinicians have launched multiple trials of available drugs, most without adequate controls and size needed to yield useful evidence. Moreover, the focus on developing monoclonal antibodies (mAbs) that are delivered intravenously has created difficulties for patients and providers.

Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases (NIAID), noted in a recent interview with JAMA that while some available therapies have been effective in treating some patients, there has been no “knock-out punch” against the virus. Administering mAbs, he explains, means a patient has to go to a hospital or infusion center, which are ill-suited for treating outpatients in early disease stages. What is needed, he said, is a “concerted effort” for developing effective combination antiviral agents that can suppress COVID-19 completely, as done for HIV and hepatitis C.¹

Moncef Slaoui, former co-director of Operation Warp Speed (OWS), similarly acknowledged the need for mAbs with formulations that permit subcutaneous or intramuscular injection to facilitate outpatient delivery to patients with mild infections. He lamented that the centralized approach for developing vaccines did not work for therapeutics, where multiple researchers have launched hundreds of small trials, most with no controls.

One sign of progress is FDA’s recent authorization of a mAb cocktail from Eli Lilly that features a notably shorter infusion time frame than other similar treatments. FDA granted emergency use authorization (EUA) for this combination of bamianivimab and etesevimab with an infusion time of 16 minutes, instead of an hour.² And ongoing tracking of testing for therapeutics to treat COVID-19 by BioCentury anticipates the release of data from late-stage studies on nearly 30 therapies, including 10 immune modulators in phase 3 or 4 trials plus studies on antimicrobials and antithrombotics.³

Too many useless trials

Several immune modulators are participating in the collaborative ACTIV-1 IM trial organized by the National Institutes of Health (NIH). More notable is the RECOVERY trial in the United Kingdom, which has yielded important clinical results on potential pandemic therapies, including a recent study showing that the rheumatoid arthritis treatment Tocilizumab from Roche can reduce deaths in hospitalized COVID-19 patients when combined with the steroid dexamethasone. Equally important is earlier RECOVERY findings that the much touted malaria drug hydroxychloroquine was not beneficial. 

But aside from a handful of such collaborative studies, most COVID-19 research on potential therapeutics has been sponsored by individual biopharma companies and academic research centers. Janet Woodcock, who has directed OWS therapeutic development this past year on leave from her position as director of the Center for Drug Evaluation and Research (CDER), reports that only 5% of the more than 400 clinical trials underway worldwide could be considered sufficiently “randomized and adequately powered” to achieve statistical significance. At a webinar in January 2021 hosted by the Clinical Trials Transformation Initiative (CTTI), Woodcock, now FDA acting commissioner, lamented the waste and duplication created by a “plethora of small, single-center trials,” most without control arms and sufficient size and structure to yield results.⁴ Moreover, the situation has created shortages in research supplies and in personnel, as well as competition for patients at medical centers, she added.

Former FDA commissioner Rob Califf, now with Verily and Google Health, similarly reported that of thousands of interventional studies to test COVID-19 therapies listed on the ClinicalTrails.gov website, most have just a few sites and have been slow to enroll patients. And many trials continue to study questionable treatments, such as hydroxychloroquine and convalescent plasma.

An FDA report on the accomplishments of its Pandemic Recovery and Preparedness Plan (PREPP) last year noted that there are no new FDA-approved therapies for COVID-19, despite nearly 3000 clinical trials on record through data from Clinical.trails.gov and the World Health Organization as of November 2020. The report concludes by calling for broader use of adaptive trial designs and master protocols to avoid such waste and redundancy.⁵

At the CTTI conference, research experts reported on progress in expanding collaborative research programs in the U.S., such as NIH’s ACTIV-3 and ACTIV-4 studies and the REMAP-CAP multi-center trial. A group of leading biopharma companies formed the COVID R&D Alliance last summer to collaborate in identifying and testing repurposed and new compounds through platform trials and data sharing. And the emergence of new virus variants is raising the need for more joint efforts, as FDA prepares new guidance to facilitate the testing and modification of vaccines, diagnostics and therapeutics to combat new pathogens, with an eye to encouraging more productive clinical research methods. Such initiatives aim to address the critical problems that have delayed effective development of COVID-19 treatments so far and to build support for more coordinated centralized clinical testing programs before the next pandemic.

Notes

1. https://www.pscp.tv/w/1zqKVXNRbyVJB

2. https://www.fda.gov/news-events/press-announcements/coronavirus-covid-19-update-fda-authorizes-monoclonal-antibodies-treatment-covid-19-0

3. https://www.biocentury.com/article/634179

4. https://ctti-clinicaltrials.org/the-fastest-path-to-effective-covid-19-treatments-using-master-protocol-studies

5. https://www.fda.gov/media/145129/download