An expert panel is meeting Thursday to consider whether the Food and Drug Administration should issue a second emergency use authorization for a Covid-19 vaccine, this one made by Moderna.
It is almost a foregone conclusion that it will. But the hearing still promises to tell us more about the vaccine and its use.
The FDA gave Moderna’s vaccine a favorable review in the leadup to the meeting, all but guaranteeing the Vaccines and Related Biological Products Advisory Committee will recommend an EUA be granted. It’s also widely expected the FDA will issue the EUA on Friday.
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Both Moderna’s vaccine and the one developed by Pfizer and its partner BioNTech, which was granted an EUA last week, use messenger RNA to instruct the body’s cells to produce copies of the spike protein found on the exterior of the SARS-CoV-2, the virus that causes Covid-19. Those vaccine-induced proteins teach the immune system to recognize the coronavirus as an invader and attack it when an immunized person is exposed to the virus.
Clinical trials showed both vaccines were highly effective, about 94% or 95% in fact, though both trigger side effects in a portion of people vaccinated.
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Last week’s recommendation set a precedent and this week’s meeting may be shorter as a result. But members of the committee, often referred to as VRBPAC, will probe the data; they always do. If you want to watch the proceedings, the meeting will be streamed here, the draft agenda for the day is here, and the roster of experts on the panel can be seen here.
STAT will be live-blogging the meeting. Matthew Herper, Damian Garde, and Helen Branswell will post updates and analysis throughout the day, in reverse chronological order. Check back often.
Addressing the elephant in the room
9:55 a.m.: The anaphylaxis issue came up quickly in today’s discussion. Doran Fink, deputy director of FDA’s division of vaccines and related products applications, raised the now two cases of allergic reactions — one of which was anaphylaxis — in health workers in Alaska on Wednesday. They followed reports of two cases of anaphylaxis in the United Kingdom last week. All of these cases were after receipt of the Pfizer vaccine.
Fink said the FDA anticipates there will be more reports of allergic reactions to the vaccines, and they will be investigated when they occur.
“While the totality of data at this time continue to support vaccinations under the Pfizer EUA without new restrictions, these cases underscore the need to be vigilant during the early stage of the campaign,” he told the committee.
The FDA is working with Pfizer to update the fact sheet and prescribing information for their vaccine to highlight guidelines for post-vaccination monitoring and management of allergic reactions, stressing the need to be able to rapidly treat anaphylaxis if it occurs. Fink said the same will be done for the Moderna vaccine, if it is authorized for use under an EUA.
— Helen Branswell
The context
6:30 a.m.: With one mRNA vaccine to prevent Covid-19 already being rolled out under an emergency use authorization in this country, a second vaccine that seems as effective will surely be approved.
And Moderna executives have chosen an easier path; the company’s EUA application asks only to be able to use the vaccine in people 18 and older. Pfizer applied for an EUA for people 16 and older, even though it had data from only 153 16- and 17-year olds. The paucity of that data caused consternation among some VRBPAC members; several voted against the recommendation based on that fact alone.
While Moderna will not face that issue, there will undoubtedly be questions about the side-effect profile of the vaccine. Documents released Tuesday by the FDA in advance of the meeting showed the Moderna vaccine appeared to be more reactogenic — that is, it was more likely to induce side effects — than the Pfizer vaccine. Nearly 16% of participants in the vaccine arm of Moderna’s Phase 3 clinical trial developed what is known as a grade 3 reaction — severe but not severe enough to be hospitalized.
There may be discussion about Bell’s palsy, a temporary facial paralysis, cases of which were reported in both the Pfizer and Moderna trials. Pfizer reported four cases of the condition among people in its vaccine arm, and none among its placebo recipients. Moderna saw three cases among people who received their vaccine, and one in the placebo arm. The National Institute of Neurological Disorders and Stroke estimates that about 40,000 Americans a year develop Bell’s palsy.
There may also be questions about anaphylaxis, a potentially life-threatening allergic reaction. On Wednesday a nurse in Alaska who had just been vaccinated with the Pfizer vaccine developed flushing, an elevated heart rate, and shortness of breath — signs of an allergic reaction. Last week, two British nurses with histories of severe allergies developed anaphylaxis after being vaccinated. VRBPAC member will likely want to know if Moderna saw any hint of allergic reactions among the trial participants it vaccinated.
On the plus side, people involved in the massive task of trying to vaccinate Americans will welcome the arrival of this vaccine. Its requirements for storage are less onerous than is the case for the Pfizer vaccine; whereas Pfizer’s must be stored at -94 Fahrenheit, which takes special freezers, the Moderna vaccine can be stored in regular freezers and, when thawed, in a refrigerator for up to 30 days. This vaccine will be much easier to use than the one that beat it to an EUA.
— Helen Branswell
VRBPAC’s agenda
6 a.m.: Good morning. The meeting starts at 9 a.m. EST with roll call, followed by a short presentation by the FDA. At 10:45 a.m., Moderna executives will make a detailed presentation on their vaccine.
But before that, at 10:05 a.m., Steven Goodman, associate dean of clinical and translational research at the Stanford University School of Medicine, will — as he did during the Pfizer VRBPAC meeting — talk about the implications of issuing EUAs for the ongoing effort to collect placebo-controlled data on the performance of Covid vaccines.
Pfizer, and now Moderna, have indicated they plan to unblind the participants in their trials when they have reached the point where they would be eligible to be vaccinated. For instance, any health workers in these trials are in the priority list currently being offered vaccine; the companies say they cannot ethically keep them in the dark about whether they received vaccine or placebo in the trial. Pfizer has already started informing some participants which arm they were in.
Last week Goodman presented an interesting but complicated idea for continuing the trials in a blinded fashion, suggesting all participants — 44,000 in the case of Pfizer, 30,000 in the case of Moderna — could be called in and given two more vaccinations. People who had first received placebo would get vaccine; those who received vaccine would receive saline shots. All would remain unaware of when they were vaccinated, but the impetus for participants to quit the trial to get vaccine would presumably dissipate.
Soon after, Pfizer senior vice president William Gruber put the kibosh on that idea, describing it as an enormous amount of work that was unlikely to have the desired effect. The company is clearly ignoring this suggestion.
Goodman’s session is scheduled for 40 minutes. Is another proposal about to be aired?
— Helen Branswell
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Tracking an FDA advisory panel's review of the Moderna Covid-19 vaccine - STAT
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