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, according to authors of a recent review covering nearly 300 active clinical treatment trials underway for the disease.
Remdesivir, which has potent in vitro activity against the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), is not approved by the Food and Drug Administration and is currently being tested in randomized trials, according to the review authors, led by James M. Sanders, PhD, of the department of pharmacy at University of Texas Southwestern Medical Center in Dallas.
By contrast, oseltamivir has not demonstrated efficacy against the virus, corticosteroids are not recommended, and promising data from a small French hydroxychloroquine study are balanced by “several major limitations” including small sample size and exclusion of early dropouts from the analysis, among others, Dr. Sanders and coauthors said in their report.
“These limitations coupled with concerns of additive cardiotoxicity with combination therapy [i.e., hydroxychloroquine with azithromycin] do not support adoption of this regimen without additional studies,” the researchers wrote. Their report is in JAMA.
Dr. Sanders and colleagues identified 291 COVID-19–specific studies listed in ClinicalTrials.gov through April 2, including 29 placebo-controlled trials.
This might represent just a sliver of the treatments that could combat COVID-19, according to the researchers, who said more than 3,000 small-molecule drug candidates with potential activity against human coronaviruses have been identified.
“This large amount of potential agents will hopefully yield more candidate therapeutics in the race to find effective treatments or preventive strategies against COVID-19,” said Dr. Sanders and coauthors.
Remdesivir for COVID-19
Remdesivir, an investigational nucleotide analog, is one promising agent because of its broad-spectrum and potent activity against SARS-CoV-2 and other novel coronaviruses, they said, adding that phase 1 trials demonstrated the drug was well tolerated without observed liver or kidney toxicity.
There have been “successful” case reports of remdesivir use in COVID-19, and at least five ongoing clinical trials are evaluating the drug’s safety and antiviral activity in this disease. Among those studies is a National Institutes of Health–sponsored adaptive, randomized, placebo-controlled trial that will provide data on the use of remdesivir versus supportive care.
“As the results from randomized controlled trials are anticipated, inclusion of this agent for treatment of COVID-19 may be considered,” Dr. Sanders and colleagues wrote in their report. To date, remdesivir remains investigational and needs to be obtained via compassionate use, through expanded access, or by participating in a clinical trial, they added.
Hydroxychloroquine and chloroquine
Among the published hydroxychloroquine studies is a “promising” 36-patient open-label nonrandomized French study, in which the antimalarial agent given every 8 hours improved virologic clearance by day 6 versus controls (70% vs. 12.5%, respectively), the review authors said. Moreover, viral clearance was 100% for 6 patients who received hydroxychloroquine plus azithromycin, compared to 57% (8 of 14) for patients treated with hydroxychloroquine alone. However, that study had several important limitations, including the small sample size, variable viral loads at baseline between groups, and a lack of safety and clinical outcomes reporting, according to the investigators. Moreover, six patients in the hydroxychloroquine group were taken out of the analysis because of early treatment stoppage due to medical intolerance or critical illness, the authors noted.
One prospective study including 30 patients in China demonstrated no difference in virologic outcomes for patients randomized to hydroxychloroquine plus standard of care versus standard of care alone, they added. There is also a case series of more than 100 patients with COVID-19 that reportedly improved viral clearance and reduced disease progression, though they said results haven’t been published or presented beyond a news briefing in China.
Randomized, controlled trials of chloroquine and hydroxychloroquine for COVID-19 treatment are underway, and studies are planned or enrolling to look at chloroquine prophylaxis in health care personnel and hydroxychloroquine for postexposure prophylaxis, authors said.
In results from one of those randomized trials, just reported, a higher dose of chloroquine was associated with a cardiac adverse event and an increased mortality risk, leading to the closure of that study arm. In the parallel, double-blinded, phase IIb clinical trial, patients in Brazil with SARS-CoV-2 infection received low or high doses of chloroquine plus ceftriaxone and azithromycin. According to the preprint publication, a higher rate of heart rate–corrected QT interval (QTc) prolongation and a “trend toward higher lethality” was observed in the high-dose group, leading investigators to “strongly recommend” the higher dose be abandoned.
“No apparent benefit of chloroquine was seen regarding lethality in our patients so far, but we will still enroll patients in the low chloroquine dose group to complete the originally planned sample size,” said investigators of the study, which at the time of the report had enrolled 81 out of an anticipated 440 patients.
Other COVID-19 pharmacologic therapies under study
Treatments of note in the review included the following:
- Tocilizumab. This monoclonal antibody IL-6 receptor antagonist, approved by the FDA for treatment of rheumatoid arthritis and for cytokine release syndrome related to chimeric antigen receptor (CAR) T-cell therapy, has yielded success in small series of patients with severe cases of COVID-19, according to authors. In one 21-patient report, 91% had clinical improvement, usually after a single dose. In China, tocilizumab is included in COVID-19 treatment guidelines, and several randomized clinical trials are underway in China including patients with COVID-19 with severe pneumonia.
- Immunoglobulin therapy. Antibodies from recovered COVID-19 patients could help with free virus and infected cell immune clearance, the authors said, adding that further studies are warranted beyond a few small published case series that suggest promise. Furthermore, on March 24 the FDA released guidance for screening donors for COVID-19 convalescent plasma and on emergency investigational new drug applications based on this modality.
- Lopinavir/ritonavir. Despite demonstrated in vitro activity against other novel coronaviruses, there is no published in vitro data for lopinavir/ritonavir in SARS-CoV-2, and likely a “limited role” for this combination anticipated in treating COVID-19, according to the review authors. In an open-label randomized clinical trial published in the New England Journal of Medicine (2020 Mar 18. doi: 10.1056/NEJMoa2001282), there were no differences in clinical improvement, viral clearance, or mortality for antiviral treatment versus standard care. Delayed treatment initiation may explain the ineffectiveness, though a subgroup analysis didn’t show a shorter time to clinical improvement for those who got the treatment earlier.
- Ribavirin. Likewise, this antiviral medication has efficacy and safety data suggesting “limited value” for treatment of COVID-19. Treatment of SARS yielded “inconclusive results” for ribavirin, which was also associated with substantial toxicity that included hemolytic anemia in 60% of SARS patients.
- Oseltamivir. While it may treat influenza, it has no documented activity against SARS-CoV-2 in vitro: “This agent has no role in the management of COVID-19 once influenza has been excluded,” said Dr. Sanders and coauthors.
- Corticosteroids. They could decrease inflammatory responses in the lung, but they could also lead to delays in viral clearance and increases in secondary infection risk. Guidelines for COVID-19 say to avoid corticosteroids, and the authors of the review concur, saying that potential harms and lack of proven benefit mean they usually should not be used outside of a randomized clinical trial setting.
- Vaccines. Clearly, vaccines represent the “most effective long-term strategy” to prevent future COVID-19 outbreaks, though at least 12-18 months would be required until vaccines can be widely deployed, authors said.
Dr. Sanders reported no potential conflicts. Senior author James B. Cutrell, MD, also of the University of Texas Southwestern Medical Center, reported nonfinancial support from Gilead and Regeneron outside of the study. No other authors reported disclosures.
, according to authors of a recent review covering nearly 300 active clinical treatment trials underway for the disease.
Remdesivir, which has potent in vitro activity against the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), is not approved by the Food and Drug Administration and is currently being tested in randomized trials, according to the review authors, led by James M. Sanders, PhD, of the department of pharmacy at University of Texas Southwestern Medical Center in Dallas.
By contrast, oseltamivir has not demonstrated efficacy against the virus, corticosteroids are not recommended, and promising data from a small French hydroxychloroquine study are balanced by “several major limitations” including small sample size and exclusion of early dropouts from the analysis, among others, Dr. Sanders and coauthors said in their report.
“These limitations coupled with concerns of additive cardiotoxicity with combination therapy [i.e., hydroxychloroquine with azithromycin] do not support adoption of this regimen without additional studies,” the researchers wrote. Their report is in JAMA.
Dr. Sanders and colleagues identified 291 COVID-19–specific studies listed in ClinicalTrials.gov through April 2, including 29 placebo-controlled trials.
This might represent just a sliver of the treatments that could combat COVID-19, according to the researchers, who said more than 3,000 small-molecule drug candidates with potential activity against human coronaviruses have been identified.
“This large amount of potential agents will hopefully yield more candidate therapeutics in the race to find effective treatments or preventive strategies against COVID-19,” said Dr. Sanders and coauthors.
Remdesivir for COVID-19
Remdesivir, an investigational nucleotide analog, is one promising agent because of its broad-spectrum and potent activity against SARS-CoV-2 and other novel coronaviruses, they said, adding that phase 1 trials demonstrated the drug was well tolerated without observed liver or kidney toxicity.
There have been “successful” case reports of remdesivir use in COVID-19, and at least five ongoing clinical trials are evaluating the drug’s safety and antiviral activity in this disease. Among those studies is a National Institutes of Health–sponsored adaptive, randomized, placebo-controlled trial that will provide data on the use of remdesivir versus supportive care.
“As the results from randomized controlled trials are anticipated, inclusion of this agent for treatment of COVID-19 may be considered,” Dr. Sanders and colleagues wrote in their report. To date, remdesivir remains investigational and needs to be obtained via compassionate use, through expanded access, or by participating in a clinical trial, they added.
Hydroxychloroquine and chloroquine
Among the published hydroxychloroquine studies is a “promising” 36-patient open-label nonrandomized French study, in which the antimalarial agent given every 8 hours improved virologic clearance by day 6 versus controls (70% vs. 12.5%, respectively), the review authors said. Moreover, viral clearance was 100% for 6 patients who received hydroxychloroquine plus azithromycin, compared to 57% (8 of 14) for patients treated with hydroxychloroquine alone. However, that study had several important limitations, including the small sample size, variable viral loads at baseline between groups, and a lack of safety and clinical outcomes reporting, according to the investigators. Moreover, six patients in the hydroxychloroquine group were taken out of the analysis because of early treatment stoppage due to medical intolerance or critical illness, the authors noted.
One prospective study including 30 patients in China demonstrated no difference in virologic outcomes for patients randomized to hydroxychloroquine plus standard of care versus standard of care alone, they added. There is also a case series of more than 100 patients with COVID-19 that reportedly improved viral clearance and reduced disease progression, though they said results haven’t been published or presented beyond a news briefing in China.
Randomized, controlled trials of chloroquine and hydroxychloroquine for COVID-19 treatment are underway, and studies are planned or enrolling to look at chloroquine prophylaxis in health care personnel and hydroxychloroquine for postexposure prophylaxis, authors said.
In results from one of those randomized trials, just reported, a higher dose of chloroquine was associated with a cardiac adverse event and an increased mortality risk, leading to the closure of that study arm. In the parallel, double-blinded, phase IIb clinical trial, patients in Brazil with SARS-CoV-2 infection received low or high doses of chloroquine plus ceftriaxone and azithromycin. According to the preprint publication, a higher rate of heart rate–corrected QT interval (QTc) prolongation and a “trend toward higher lethality” was observed in the high-dose group, leading investigators to “strongly recommend” the higher dose be abandoned.
“No apparent benefit of chloroquine was seen regarding lethality in our patients so far, but we will still enroll patients in the low chloroquine dose group to complete the originally planned sample size,” said investigators of the study, which at the time of the report had enrolled 81 out of an anticipated 440 patients.
Other COVID-19 pharmacologic therapies under study
Treatments of note in the review included the following:
- Tocilizumab. This monoclonal antibody IL-6 receptor antagonist, approved by the FDA for treatment of rheumatoid arthritis and for cytokine release syndrome related to chimeric antigen receptor (CAR) T-cell therapy, has yielded success in small series of patients with severe cases of COVID-19, according to authors. In one 21-patient report, 91% had clinical improvement, usually after a single dose. In China, tocilizumab is included in COVID-19 treatment guidelines, and several randomized clinical trials are underway in China including patients with COVID-19 with severe pneumonia.
- Immunoglobulin therapy. Antibodies from recovered COVID-19 patients could help with free virus and infected cell immune clearance, the authors said, adding that further studies are warranted beyond a few small published case series that suggest promise. Furthermore, on March 24 the FDA released guidance for screening donors for COVID-19 convalescent plasma and on emergency investigational new drug applications based on this modality.
- Lopinavir/ritonavir. Despite demonstrated in vitro activity against other novel coronaviruses, there is no published in vitro data for lopinavir/ritonavir in SARS-CoV-2, and likely a “limited role” for this combination anticipated in treating COVID-19, according to the review authors. In an open-label randomized clinical trial published in the New England Journal of Medicine (2020 Mar 18. doi: 10.1056/NEJMoa2001282), there were no differences in clinical improvement, viral clearance, or mortality for antiviral treatment versus standard care. Delayed treatment initiation may explain the ineffectiveness, though a subgroup analysis didn’t show a shorter time to clinical improvement for those who got the treatment earlier.
- Ribavirin. Likewise, this antiviral medication has efficacy and safety data suggesting “limited value” for treatment of COVID-19. Treatment of SARS yielded “inconclusive results” for ribavirin, which was also associated with substantial toxicity that included hemolytic anemia in 60% of SARS patients.
- Oseltamivir. While it may treat influenza, it has no documented activity against SARS-CoV-2 in vitro: “This agent has no role in the management of COVID-19 once influenza has been excluded,” said Dr. Sanders and coauthors.
- Corticosteroids. They could decrease inflammatory responses in the lung, but they could also lead to delays in viral clearance and increases in secondary infection risk. Guidelines for COVID-19 say to avoid corticosteroids, and the authors of the review concur, saying that potential harms and lack of proven benefit mean they usually should not be used outside of a randomized clinical trial setting.
- Vaccines. Clearly, vaccines represent the “most effective long-term strategy” to prevent future COVID-19 outbreaks, though at least 12-18 months would be required until vaccines can be widely deployed, authors said.
Dr. Sanders reported no potential conflicts. Senior author James B. Cutrell, MD, also of the University of Texas Southwestern Medical Center, reported nonfinancial support from Gilead and Regeneron outside of the study. No other authors reported disclosures.
, according to authors of a recent review covering nearly 300 active clinical treatment trials underway for the disease.
Remdesivir, which has potent in vitro activity against the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), is not approved by the Food and Drug Administration and is currently being tested in randomized trials, according to the review authors, led by James M. Sanders, PhD, of the department of pharmacy at University of Texas Southwestern Medical Center in Dallas.
By contrast, oseltamivir has not demonstrated efficacy against the virus, corticosteroids are not recommended, and promising data from a small French hydroxychloroquine study are balanced by “several major limitations” including small sample size and exclusion of early dropouts from the analysis, among others, Dr. Sanders and coauthors said in their report.
“These limitations coupled with concerns of additive cardiotoxicity with combination therapy [i.e., hydroxychloroquine with azithromycin] do not support adoption of this regimen without additional studies,” the researchers wrote. Their report is in JAMA.
Dr. Sanders and colleagues identified 291 COVID-19–specific studies listed in ClinicalTrials.gov through April 2, including 29 placebo-controlled trials.
This might represent just a sliver of the treatments that could combat COVID-19, according to the researchers, who said more than 3,000 small-molecule drug candidates with potential activity against human coronaviruses have been identified.
“This large amount of potential agents will hopefully yield more candidate therapeutics in the race to find effective treatments or preventive strategies against COVID-19,” said Dr. Sanders and coauthors.
Remdesivir for COVID-19
Remdesivir, an investigational nucleotide analog, is one promising agent because of its broad-spectrum and potent activity against SARS-CoV-2 and other novel coronaviruses, they said, adding that phase 1 trials demonstrated the drug was well tolerated without observed liver or kidney toxicity.
There have been “successful” case reports of remdesivir use in COVID-19, and at least five ongoing clinical trials are evaluating the drug’s safety and antiviral activity in this disease. Among those studies is a National Institutes of Health–sponsored adaptive, randomized, placebo-controlled trial that will provide data on the use of remdesivir versus supportive care.
“As the results from randomized controlled trials are anticipated, inclusion of this agent for treatment of COVID-19 may be considered,” Dr. Sanders and colleagues wrote in their report. To date, remdesivir remains investigational and needs to be obtained via compassionate use, through expanded access, or by participating in a clinical trial, they added.
Hydroxychloroquine and chloroquine
Among the published hydroxychloroquine studies is a “promising” 36-patient open-label nonrandomized French study, in which the antimalarial agent given every 8 hours improved virologic clearance by day 6 versus controls (70% vs. 12.5%, respectively), the review authors said. Moreover, viral clearance was 100% for 6 patients who received hydroxychloroquine plus azithromycin, compared to 57% (8 of 14) for patients treated with hydroxychloroquine alone. However, that study had several important limitations, including the small sample size, variable viral loads at baseline between groups, and a lack of safety and clinical outcomes reporting, according to the investigators. Moreover, six patients in the hydroxychloroquine group were taken out of the analysis because of early treatment stoppage due to medical intolerance or critical illness, the authors noted.
One prospective study including 30 patients in China demonstrated no difference in virologic outcomes for patients randomized to hydroxychloroquine plus standard of care versus standard of care alone, they added. There is also a case series of more than 100 patients with COVID-19 that reportedly improved viral clearance and reduced disease progression, though they said results haven’t been published or presented beyond a news briefing in China.
Randomized, controlled trials of chloroquine and hydroxychloroquine for COVID-19 treatment are underway, and studies are planned or enrolling to look at chloroquine prophylaxis in health care personnel and hydroxychloroquine for postexposure prophylaxis, authors said.
In results from one of those randomized trials, just reported, a higher dose of chloroquine was associated with a cardiac adverse event and an increased mortality risk, leading to the closure of that study arm. In the parallel, double-blinded, phase IIb clinical trial, patients in Brazil with SARS-CoV-2 infection received low or high doses of chloroquine plus ceftriaxone and azithromycin. According to the preprint publication, a higher rate of heart rate–corrected QT interval (QTc) prolongation and a “trend toward higher lethality” was observed in the high-dose group, leading investigators to “strongly recommend” the higher dose be abandoned.
“No apparent benefit of chloroquine was seen regarding lethality in our patients so far, but we will still enroll patients in the low chloroquine dose group to complete the originally planned sample size,” said investigators of the study, which at the time of the report had enrolled 81 out of an anticipated 440 patients.
Other COVID-19 pharmacologic therapies under study
Treatments of note in the review included the following:
- Tocilizumab. This monoclonal antibody IL-6 receptor antagonist, approved by the FDA for treatment of rheumatoid arthritis and for cytokine release syndrome related to chimeric antigen receptor (CAR) T-cell therapy, has yielded success in small series of patients with severe cases of COVID-19, according to authors. In one 21-patient report, 91% had clinical improvement, usually after a single dose. In China, tocilizumab is included in COVID-19 treatment guidelines, and several randomized clinical trials are underway in China including patients with COVID-19 with severe pneumonia.
- Immunoglobulin therapy. Antibodies from recovered COVID-19 patients could help with free virus and infected cell immune clearance, the authors said, adding that further studies are warranted beyond a few small published case series that suggest promise. Furthermore, on March 24 the FDA released guidance for screening donors for COVID-19 convalescent plasma and on emergency investigational new drug applications based on this modality.
- Lopinavir/ritonavir. Despite demonstrated in vitro activity against other novel coronaviruses, there is no published in vitro data for lopinavir/ritonavir in SARS-CoV-2, and likely a “limited role” for this combination anticipated in treating COVID-19, according to the review authors. In an open-label randomized clinical trial published in the New England Journal of Medicine (2020 Mar 18. doi: 10.1056/NEJMoa2001282), there were no differences in clinical improvement, viral clearance, or mortality for antiviral treatment versus standard care. Delayed treatment initiation may explain the ineffectiveness, though a subgroup analysis didn’t show a shorter time to clinical improvement for those who got the treatment earlier.
- Ribavirin. Likewise, this antiviral medication has efficacy and safety data suggesting “limited value” for treatment of COVID-19. Treatment of SARS yielded “inconclusive results” for ribavirin, which was also associated with substantial toxicity that included hemolytic anemia in 60% of SARS patients.
- Oseltamivir. While it may treat influenza, it has no documented activity against SARS-CoV-2 in vitro: “This agent has no role in the management of COVID-19 once influenza has been excluded,” said Dr. Sanders and coauthors.
- Corticosteroids. They could decrease inflammatory responses in the lung, but they could also lead to delays in viral clearance and increases in secondary infection risk. Guidelines for COVID-19 say to avoid corticosteroids, and the authors of the review concur, saying that potential harms and lack of proven benefit mean they usually should not be used outside of a randomized clinical trial setting.
- Vaccines. Clearly, vaccines represent the “most effective long-term strategy” to prevent future COVID-19 outbreaks, though at least 12-18 months would be required until vaccines can be widely deployed, authors said.
Dr. Sanders reported no potential conflicts. Senior author James B. Cutrell, MD, also of the University of Texas Southwestern Medical Center, reported nonfinancial support from Gilead and Regeneron outside of the study. No other authors reported disclosures.
FROM JAMA