The current pandemic of SARS-CoV-2 causing COVID-19 disease is an unprecedented global emergency. COVID-19 appears to be a disease with an early phase where the virus replicates, coinciding with first presentation of symptoms, followed by a later 'inflammatory' phase which results in severe disease in some individuals. It is known from other rapidly progressive infections such as sepsis and influenza that early treatment with antimicrobials is associated with better outcome. Antiviral medications are most likely to be effective when administered soon after infection. There is therefore an urgent need to study subjects who have recently developed symptoms, or have recently been tested positive with or without symptoms, and who can be sampled frequently to understand changes in viral load. This cohort will allow us to collect detailed trajectory data on early disease and understand how pharmacological interventions may affect this. The objective of the FLARE trial is to assess whether early antiviral therapy with either favipiravir + Lopinavir/ritonavir (LPV/r), LPV/r or favipiravir is associated with a decrease in viral load compared with placebo. The hypothesis is that this holds for COVID-19 and that early antiviral treatment may prevent progression to the later phase of the disease.
FLARE is a phase IIA randomised, double-blind, 2x2 factorial placebo-controlled,
interventional trial in which 240 participants, aged 18 years (≥ 18 years) to 70 years old
inclusive will be recruited. Participants will be adults who have developed the early
symptoms of COVID-19 within the first 5 days, or tested positive for SARS-CoV-2 within the
first 7 days of symptom onset, or not presenting symptoms but tested positive within the last
48 hours (date/time of test must be within 48 hours of enrolment).
Eligible participants will be randomised 1:1:1:1 to receive one of the following
combinations:
Favipiravir + Lopinavir/ritonavir (LPV/r) (both active); Favipiravir active +
Lopinavir/ritonavir (LPV/r) placebo; Favipiravir placebo + Lopinavir/ritonavir (LPV/r)
active; Favipiravir placebo + Lopinavir/ritonavir (LPV/r) placebo;
All participants will be enrolled and followed up for 28 days. A saliva sample for
virological analysis and safety blood samples will be collected at baseline, as well as a
diagnostic nose and throat swab, if the participant hasn't been tested for COVID-19 yet.
Following randomisation, participants will take trial medication for 7 days and during this
period will take a daily saliva sample and complete a symptoms diary including four daily
temperature measurements.
Participants will have two follow-up visits at Day 7 and Day 14 where they will be assessed
and undergo blood tests for toxicity and pharmacokinetic assessment (on Day 7 only) and
provide stool samples. Participants will have a telephone follow up three (3) weeks after
their last day of treatment (Day 7) and further information will be collected through a
questionnaire.
Drug: Favipiravir
Dosage and method of administration: Day 1: 1800 mg twice daily; Day 2 to Day 7: 400 mg four (4) times daily.
Other Name: Avigan
Drug: Lopinavir/ Ritonavir
Dosage and method of administration: Day 1: 400mg/100 mg twice daily; Day 2 to Day 7: 200mg/50mg four (4) times daily
Other Name: Kaletra
Other: Favipiravir Placebo
Dosage and method of administration: Day 1: 1800 mg twice daily; Day 2 to Day 7: 400 mg four (4) times daily.
Other: Lopinavir/ Ritonavir Placebo
Dosage and method of administration: Day 1: 1800 mg twice daily; Day 2 to Day 7: 400 mg four (4) times daily.
Inclusion Criteria:
1. Any adult with the following:
- Symptoms compatible with COVID-19 disease (Fever >37.8oC on at least one occasion
AND either cough and/ or anosmia) within the first 5 days of symptom onset
- OR ANY symptoms compatible with COVID-19 disease (may include, but are not
limited to fever, cough, shortness of breath, malaise, myalgia, headache, coryza)
and tested positive for SARS-CoV-2 within the first 7 days of symptom onset
- OR no symptoms but tested positive for SARS-CoV-2 within the last 48 hours
(date/time of test must be within 48 hours of enrolment)
2. Male or female aged 18 years to 70 years old inclusive at screening
3. Willing and able to take daily saliva samples
4. Able to provide full informed consent and willing to comply with trial-related
procedures
Exclusion Criteria:
1. Known hypersensitivity to any of the active ingredients or excipients in favipiravir
and matched placebo, and in lopinavir/ritonavir and matched placebo
2. Chronic liver disease at screening (known cirrhosis of any aetiology, chronic
hepatitis (e.g. autoimmune, viral, steatohepatitis), cholangitis or any known
elevation of liver aminotransferases with AST or ALT > 3 X ULN)*
3. Chronic kidney disease (stage 3 or beyond) at screening: eGFR < 60 ml/min/1.73m2*
4. HIV infection, if untreated, detectable viral load or on protease inhibitor therapy
5. Any clinical condition which the investigator considers would make the participant
unsuitable for the trial
6. Concomitant medications known to interact with favipiravir and matched placebo, and
with lopinavir/ritonavir and matched placebo, and carry risk of toxicity for the
participant
7. Current severe illness requiring hospitalisation
8. Pregnancy and/ or breastfeeding
9. Eligible female participants of childbearing potential and male participants with a
partner of childbearing potential not willing to use highly effective contraceptive
measures during the trial and within the time point specified following last trial
treatment dose.
10. Participants enrolled in any other interventional drug or vaccine trial (co-enrolment
in observational studies is acceptable).
- Considering the importance of early treatment of COVID-19 to impact viral load,
the absence of chronic liver/ kidney disease will be confirmed verbally by the
participant during pre-screening and Screening/Baseline visit. Safety blood
samples will be collected at Screening/Baseline visit (Day 1) and test results
will be examined as soon as they become available within 24 hours.
Royal Free Hospital
London, United Kingdom
University College London Hospital (UCLH)
London, United Kingdom
David Lowe, Principal Investigator
Institute of Immunity and Transplantation, University College London