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At a news conference Sunday announcing the emergency approval of blood plasma for hospitalized COVID-19 patients, President Donald Trump and two of his top health officials cited the same statistic: that the treatment had reduced deaths by 35%.
Trump called it a “tremendous” number. His health and human services secretary, Alex Azar, a former pharmaceutical executive, said, “I don’t want you to gloss over this number.” And Dr. Stephen M. Hahn, commissioner of the Food and Drug Administration, said 35 out of 100 COVID-19 patients “would have been saved because of the administration of plasma.”
But scientists were taken aback by the way the administration framed this data, which appeared to have been calculated based on a small subgroup of hospitalized COVID-19 patients in a Mayo Clinic study: those who were under 80 years old, not on ventilators and received plasma known to contain high levels of virus-fighting antibodies within three days of diagnosis.
What’s more, many experts — including a scientist who worked on the Mayo Clinic study — were bewildered about where the statistic came from. The number was not mentioned in the official authorization letter issued by the agency, nor was it in a 17-page memo written by FDA scientists. It was not in an analysis conducted by the Mayo Clinic that has been frequently cited by the administration.
“For the first time ever, I feel like official people in communications and people at the FDA grossly misrepresented data about a therapy,” said Dr. Walid Gellad, who leads the Center for Pharmaceutical Policy and Prescribing at the University of Pittsburgh.
It is especially worrisome, he said, given concerns over how Trump has appeared to politicize the process of approving treatments and vaccines for the coronavirus. Over the next couple of months, as data emerges from vaccine clinical trials, the safety of potentially millions of people will rely on the scientific judgment of the FDA. “That’s a problem if they’re starting to exaggerate data,” Gellad said. “That’s the big problem.”
When asked where the 35% figure came from, an agency spokeswoman initially directed a reporter to a graph of survival statistics buried in the Trump administration’s application for emergency authorization. The chart, analyzing the same tiny subset of Mayo Clinic study patients, did not include numerical figures, but it appeared to indicate a 30-day survival probability of about 63% in patients who received plasma with a low level of antibodies, compared with about 76% in those who received a high level of antibodies.
On Monday, Dr. Peter Marks, the director of FDA’s center for biologics, evaluation and research, said that the agency reviewed published studies of plasma and conducted its own analysis of data from the Mayo Clinic’s program of hospitalized patients who received plasma. Although the size of the benefit varied, he said in a statement, “there appears to be roughly a 35% relative improvement in the survival rates of patients” who received the plasma with higher versus lower levels of antibodies.
He added: “Given the safety profile observed, the totality of evidence regarding potential efficacy more than adequately met the ‘may be effective’ standard for granting an Emergency Use Authorization.”
Convalescent plasma, the pale yellow liquid left over after blood is stripped of its red and white cells, has been the subject of months of enthusiasm from scientists, celebrities and Trump, part of the administration’s push for coronavirus treatments as a stopgap while pharmaceutical companies race to complete dozens of clinical trials for coronavirus vaccines.
Although there have been some positive signs that it can reduce deaths in COVID-19 patients, no randomized trials have shown that it works. A popular access program set up this spring by the FDA and run by the Mayo Clinic has provided the treatment to more than 70,000 people, but it has also, some researchers said, hindered enrollment in the more rigorous randomized trials that could definitively prove whether it works. The emergency authorization released Sunday broadens that access.
Statisticians and scientists said that Hahn, in saying at the news conference that 35 out of 100 sick COVID-19 patients would have been saved by receiving plasma, appeared to have overstated the benefits.
Dr. Robert Califf, who was FDA commissioner under President Barack Obama, said on Twitter on Sunday that Hahn should correct his statement.
The publicly released data from the Mayo Clinic shows that, among the larger group of more than 35,000 patients, when plasma was given within three day of diagnosis, the death rate was about 22%, compared with 27% when it was given four or more days after diagnosis.
Dr. Eric Topol, a professor of molecular medicine at Scripps Research in La Jolla, California, and a longtime expert in clinical trials, said that convalescent plasma has not yet shown the benefit that Hahn described — and that he should issue a correction.
“He needs to come out with that, and until he does, he has no credibility as an FDA commissioner,” Topol said.
On Monday night, after this article was published, Hahn tweeted about the scientific response to his remarks, saying the “criticism is entirely justified.” He clarified that his earlier statements suggested an absolute reduction in risk, instead of the relative risk of a certain group of patients compared with another.
On Sunday night, an agency spokeswoman had posted a chart on Twitter claiming that plasma “has shown to be beneficial” for 35% of patients — neglecting to mention that the figure was based on a subset of a subset of the data.
In an interview Monday, one of the Mayo Clinic study’s main authors, Dr. Arturo Casadevall of Johns Hopkins University in Baltimore, said he was also stumped. “Do I know where the 35% comes from?” he said. “No.”
Casadevall said that the FDA had conducted its own analyses of the data, and that the paper he and his colleagues posted this month to a so-called preprint server — before it has been peer reviewed by a medical journal — contained only a portion of the total available data.
Casadevall said focusing on the 35% number distracted from the broader takeaway: that convalescent plasma shows promise, at a time when doctors have few other options. “I think that I would not focus so much on that — people can say things in many different ways, but I think that one has to look at the data,” he said. “I think the important thing is that all the indicators show a reduction in mortality.”
Emily R. Smith, an epidemiologist at The George Washington University Milken Institute School of Public Health in Washington, D.C., agreed that the issue was a distraction, but for a different reason.
“We’re trying to track down numbers and preprints and Twitter slides, and that’s a big distraction from the bigger issue of — do we think there’s good evidence to suggest this is safe and effective?” she said.
She and others, including the FDA in the emergency authorization itself, have said that existing data — from the Mayo Clinic and other nonrandomized studies — cannot replace rigorous trials that will more definitively indicate whether and in what groups of patients the treatment is effective. On Monday, the chief scientist for the World Health Organization, Dr. Soumya Swaminathan, said at a news conference in Geneva that only a few of these convalescent plasma trials had reported findings, and that the trials had been relatively small. “The results in some cases point to some benefit but have not been conclusive,” she said. “At the moment it’s still very low-quality evidence.”
This article originally appeared in The New York Times.
© 2020 The New York Times Company

When Rabbi Susan Talve heard that Patricia and Mark McCloskey would be among the speakers addressing the Republican National Convention, she decided she could no longer stay quiet.
“It’s so upsetting that they have a national audience,” Talve said. “It’s upsetting we make heroes out of people who hate.”
The McCloskeys are Talve’s neighbors. Their property’s northern wall abuts the property of St. Louis’ Jewish Central Reform Congregation, where Talve is the rabbi.
In 2013, the synagogue placed beehives along the wall to produce honey for Rosh Hashanah, the Jewish New Year. One morning they found the hives destroyed and all the bees dead. Mark McCloskey had taken an ax or sledgehammer to them.
His issue? The fence between them sat six inches inside the McCloskey’s property line. The hives were his to wreck.
“He could have picked up the phone and said, ‘Hey, those beehives are on my property,’ and we would have happily moved them,” said Talve.
Related story: That Time Donald Trump’s Father Was Arrested At A KKK Rally In Queens
She said children at the synagogue wept when they heard the news of the hives. The synagogue maintains raised bed gardens on its property that supply some 2,000 pounds of fresh produce to a local food pantry, as well as pear, fig and apple trees.
“We were going to have our own apples and honey for Rosh Hashanah!” she said.
She said the McCloskeys didn’t contact the temple at all before lashing out.
Instead, McCloskey left a note threatening to sue the synagogue for damages if the shattered hives were not removed at once.
“Civility,” Talve said. “I’m willing to speak out now because there’s such a lack of civility that’s happening, and I don’t feel like I can be a part of that, and silence is complicity.”
Talve paused.
“They are bullies,” she said. “The fact that they’re speaking at the convention is a win for bullies.”
Judging by their remarks at the Republican National Convention Monday night, the McCloskeys clearly don’t see it that way. They are the victims of a Democratic-run city that lets lawbreakers run rampant.
“What you saw happen to us could just as easily happen to you who are watching from quiet neighborhoods around our country,” Patricia McCloskey said to the convention.
“It seems the Democrats view the job of the government as protecting criminals from honest citizens,” said her husband.
When reporter Jeremy Kohler broke the storyof the McCloskey’s anti-beehive rampage in the St. Louis Post-Dispatch, Talve confirmed what happened but otherwise refrained from speaking out against the couple.

Image by Jewish Central Reform Con...
Mark McCloskey left this note after he destroyed bee hives owned by neighboring Jewish Central Reform Congregation
“At the time, we decided not to, because it was on their property,” she said. “They’re both attorneys. They’ve caused a lot of trouble for people. The advice that we got was, let it go. We live next door to these people that have guns and we have children. But every once in a while you have to speak up and say enough.”
The McCloskeys made national headlines by waving guns at Black Lives Protesters who neared their mansion on tony Portland Place on the evening of June 28.
But by then they already had a long and well-documented history of litigation, threats and neighborhood feuds.
They were locked in litigation to make their neighborhood association enforce a rule against unmarried couples residing there. Talve said they only cared because a gay couple had moved into the exclusive neighborhood.
“Certain people on Portland Place, for political reasons, wanted to make it a gay issue,” Mark McCloskey told The Post-Dispatch.
But Talve doesn’t buy it.
“Any chance they have to sow division they’ll take it,” she said.
She said the couple’s actions during the evening of the Black Lives Matter march are a case in point.
The protesters were peaceful, Talve said.
She said she knew this because many members of her synagogue marched with them, and she works closely with many of the local BLM activists.
In 2014, during protests over the police killing of Michael Brown in Ferguson, Missouri, Talve was the most outspoken Jewish religious leader at the scene.
In 2017 Talve’s synagogue opened its doors to provide refuge for protesters when a march against police violence itself turned violent.
At the time, a trending Twitter hashtag called on the police to #GasTheSynagogue.
Talve is certain such stances did not make her congregation popular with the McCloskeys or the well-armed people in the area who support them. During the June 28 march, she said BLM members stationed themselves in the parking lot to protect the synagogue from possible attack from militia-like groups.
Instead of the McCloskeys, Talve said the real hero in the June 28 confrontations is St. Louis circuit attorney Kimberly Gardner, who filed charges against the couple for unlawful use of weapons and pointing firearms at protesters, which is a class E felony.
“The protestors were not charged with a crime,” Mark McCloskey said at the convention, “but she charged us with felonies for daring to defend our home.”
President Donald Trump has also publicly criticized Gardner for prosecuting the McCloskeys.
“These are the values that this administration has been putting forward, values that sow hate among people,” said Talve. “They stand for a kind of white supremacist system. Our resistance is to love each other.”
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