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May 22, 2020 01:05 PM

Big study casts more doubt on malaria drugs for coronavirus

Associated Press
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    Malaria drugs pushed by President Donald Trump as treatments for the coronavirus did not help and were tied to a greater risk of death and heart rhythm problems in a new study of nearly 100,000 patients around the world.

    Friday's report in the journal Lancet is not a rigorous test of hydroxychloroquine or chloroquine, but it is by far the largest look at their use in real world settings, spanning 671 hospitals on six continents.

    "Not only is there no benefit, but we saw a very consistent signal of harm," said one study leader, Dr. Mandeep Mehra, a heart specialist at Brigham and Women's Hospital in Boston.

    Researchers estimate that the death rate attributable to use of the drugs, with or without an antibiotic such as azithromycin, is roughly 13% versus 9% for patients not taking them. The risk of developing a serious heart rhythm problem is more than five times greater.

    Even though it is only observational, the size and scope of the study gives it a lot of impact, said Dr. David Aronoff, infectious diseases chief at Vanderbilt University Medical Center.

    "It really does give us some degree of confidence that we are unlikely to see major benefits from these drugs in the treatment of COVID-19 and possibly harm," said Aronoff, who was not involved in the research.

    Trump repeatedly has pushed the malaria drugs, and has said he is taking hydroxychloroquine to try to prevent infection or minimize symptoms from the coronavirus.

    The drugs are approved for treating lupus and rheumatoid arthritis and for preventing and treating malaria, but no large rigorous tests have found them safe or effective for preventing or treating COVID-19. People sick enough to be hospitalized with the coronavirus are not the same as healthy people taking the drugs in other situations, so safety cannot be assumed from prior use, Mehra said.

    These drugs also have potentially serious side effects. The Food and Drug Administration has warned against taking hydroxychloroquine with antibiotics and has said the malaria drug should only be used for coronavirus in formal studies.

    Lacking results from stricter tests, "one needs to look at real-world evidence" to gauge safety or effectiveness, Mehra said. The results on these patients, from a long-established global research database, are "as real world as a database can get," he said.

    His study looked at nearly 15,000 people with COVID-19 getting one of the malaria drugs with or without one of the suggested antibiotics and more than 81,000 patients getting none of those medications.

    In all, 1,868 took chloroquine alone, 3,783 took that plus an antibiotic, 3,016 took hydroxychloroquine alone and 6,221 took that plus an antibiotic.

    About 9% of patients taking none of the drugs died in the hospital, versus 16% on chloroquine, 18% on hydroxychloroquine, 22% on chloroquine plus an antibiotic, and 24% on hydroxychloroquine plus an antibiotic.

    After taking into account age, smoking, various health conditions and other factors that affect survival, researchers estimate that use of the drugs may have contributed to 34% to 45% of the excess risk of death they observed.

    About 8% of those taking hydroxychloroquine and an antibiotic developed a heart rhythm problem vs. 0.3% of the patients not taking any of the drugs in the study. More of these problems were seen with the other drugs, too.

    The results suggest these drugs are "not useful and may be harmful" in people hospitalized with COVID-19, professor Christian Funck-Brentano, of the Sorbonne University in Paris, wrote in a commentary published by the journal. He had no role in the study.

    Experiments underway now to test these drugs in a strict manner "need to be completed and should not be stopped prematurely," Aronoff said.

    Even though the Lancet study was large, observational look-backs like this "cannot control for every possible factor that may be responsible for observed results," he said.

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