“I think this is a promising study that suggests that a regimen of interferon beta-1b, lopinavir/ritonavir, and ribavirin can shorten the duration of infection and improve symptoms in COVID-19 patients especially if started early in disease, in less than 7 days of symptom onset,” he said in reply to a request for expert analysis.
“The open-label nature and small size of the study limits the broad use of the regimen as noted by the authors, and it’s important to emphasize that the subjects enrolled did not have very severe disease (not in the ICU). However, the study does suggest that a larger truly randomized study is warranted,” he said.
AIDS drugs repurposed
Lopinavir/ritonavir is commonly used to treat HIV/AIDS throughout the world, and the investigators had previously reported that the antiviral agents combined with ribavirin reduced deaths and the need for intensive ventilator support among patients with SARS-CoV, the betacoronavirus that causes severe acute respiratory syndrome (SARS), and antivirals have shown in vitro activity against both SARS-CoV and MERS-CoV, the closely related pathogen that causes Middle East respiratory syndrome.
“ However the viral load of SARS and MERS peaks at around day 7-10 after symptom onset, whereas the viral load of COVID-19 peaks at the time of presentation, similar to influenza. Experience from the treatment of patients with influenza who are admitted to hospital suggested that a combination of multiple antiviral drugs is more effective than single-drug treatments in this setting of patients with a high viral load at presentation,” the investigators wrote.
To test this, they enrolled adults patients admitted to one of six Hong Kong Hospitals for virologically confirmed COVID-19 infections from Feb. 10 through March 20, 2020.
A total of 86 patients were randomly assigned to the combination and 41 to lopinavir/ritonavir alone as controls, at doses described above.
Patients who entered the trial within less than 7 days of symptom onset received the triple combination, with interferon dosing adjusted according to the day that treatment started. Patients recruited 1 or 2 days after symptom onset received three doses of interferon, patients started on day 3 or 4 received two doses, and those started on days 5 or 6 received one interferon dose. Patients recruited 7 days or later from symptom onset did not receive interferon beta-1b because of its proinflammatory effects.
In post-hoc analysis by day of treatment initiation, clinical and virological outcomes (except stool samples) were superior in patients admitted less than 7 days after symptom onset for the 52 patients who received a least one interferon dose plus lopinavir/ritonavir and ribavirin, compared with 24 patients randomized to the control arm (lopinavir/ritonavir only). In contrast, among patients admitted and started on treatment at day 7 or later after symptom onset, there were no differences between those who received lopinavir/ritonavir alone or combined with ribavirin.
Adverse events were reported in 41 of 86 patients in the combination group and 20 of 41 patients in the control arm. The most common adverse events were diarrhea, occurring in 52 of all 127 patients, fever in 48, nausea in 43, and elevated alanine transaminase level in 18. The side effects generally resolved within 3 days of the start of treatments.
There were no serious adverse events reported in the combination group. One patient in the control group had impaired hepatic enzymes requiring discontinuation of treatment. No patients died during the study.
The study was funded by the Shaw Foundation, Richard and Carol Yu, May Tam Mak Mei Yin, and Sanming Project of Medicine. The authors and Dr. Medoff declared no competing interests.
SOURCE: Hung IFN et al. Lancet. 2020 May 8. doi: 10.1016/S0140-6736(20)31101-6.