CClinicalTrials.gg
Sign In
CompletedNCT04940182Updated Jul 27, 2023

A Study to Assess the Efficacy and Safety of XC221 in Patients With Mild COVID-19

A Phase 3 interventional study of XC221 and Placebo in Sars-CoV-2 Infection, sponsored by RSV Therapeutics LLC. Completed at 11 sites in Russian Federation. Open to participants aged 18 Years to 75 Years. Per ClinicalTrials.gov, last updated 2023-07-27.

Sponsored by RSV Therapeutics LLC · Phase 3, Interventional, and Treatment

Phase
Phase 3
Study type
Interventional
Enrollment
274
Allocation
Randomized
Ages
18 Years to 75 Years
Sex
All
01

Study summary

The innovative drug XC221 100 mg tablet is designed for the treatment of COVID-19 (SARS-CoV-2 infection). A multicenter, adaptive, randomized, double-blind, placebo-controlled Phase III clinical study is aimed to assess the efficacy and safety of XC221 100 mg tablet, in mild COVID-19 patients during a 14-days treatment.

The primary objective of the study is to demonstrate the efficacy of XC221 100 mg tablet (200 mg daily dose) in achieving clinical improvement of mild COVID-19 symptoms.

The secondary objective of the study is to evaluate the safety of XC221 100 mg tablet (200 mg daily dose) in mild COVID-19 patients.

Read the detailed description

8 Russian centers will participate in this study. The trail will consist of three periods: screening (duration not more than 1 day, it may coincide with the randomization visit and beginning of drug administration), treatment period (14 full days) and follow-up period (15 ± 1 days after completion of treatment with XC221 / Placebo). The duration of participation in the study for each patient will be no more than 32 days.

274 eligible patients with confirmed COVID-19 will be randomized into two groups (Group A and Group B) in a 1:1 ratio: Group A - XC221 200 mg daily (137 patients); Group В - Placebo (137 patients).

During the treatment period (14 full days), 1 tablet of XC221 / Placebo will be administered 2 times a day in addition to the standard of care (SoC) for COVID-19 according to The Temporary guidelines for the prevention, diagnosis and treatment of SARS-CoV-2 infection of the Ministry of Health of the Russian Federation (the MoH Temporary Guidelines). The follow-up period will last for 15 ± 1 days.

02

Conditions studied

  • Sars-CoV-2 Infection

Browse trials for

Keywords

  • COVID-19
  • Coronavirus
03

In context

COVID-19

7,640 studies on the registry are indexed under COVID-19; 488 are open to participants now.

This study's enrollment of 274 is above the median of 100 across 4,099 interventional studies indexed under COVID-19.

Browse COVID-19 studies →

Lead sponsor

RSV Therapeutics LLC is the lead sponsor of 2 studies on the registry; none are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 75 Years
Sexes eligible
All
Accepts healthy volunteers
No

Inclusion criteria

  1. Signed Informed Consent Form.
  2. Patients of both sexes aged 18 to 75 years inclusive.
  3. Diagnosed COVID-19 based on positive laboratory tests confirming the SARS-CoV-2 presence, performed no earlier than 3 days before screening. It is allowed to determine the SARS-CoV-2 by the PCR or by another method according to the MoH Temporary Guidelines.
  4. Patients having a total score ≥ 5 according to the COVID-19 Major Symptom Rating Scale.
  5. Patients with mild COVID-19, as defined in The MoH Temporary Guidelines. Presence of at least two criteria: SpO2 ≥ 95% (required criterion), 37.5°С ≤ t ˂ 38°С, or respiratory rate (RR) ≤ 22 / min. Absence of moderate/severe progression criteria.

  6. Disease duration is no more than 3 full days since the onset of one or more of symptoms below before the first dose of the drug administration:

    • body temperature increase;
    • dry cough or cough with little phlegm;
    • dyspnoea;
    • myalgia;
    • fatigue;
    • feeling of congestion in the chest;
    • reduced sense of smell and / or taste.
  7. For women only: negative pregnancy test result. Pregnancy testing is not required for women of not childbearing potential (WONCBP): women who are in menopause (defined as an absence of menstruation for at least 2 years or more), or women who undergone surgical sterilization (hysterectomy, bilateral oophorectomy, tubal ligation), or women with a clinical diagnosis of "infertility". The presence of surgical sterilization and infertility should be confirmed by patient's claim or by relevant document confirming this condition.
  8. Consent to use reliable method of contraception throughout the study period.
  9. Patients who are able to understand and comply with treatment and procedures during the study.

Exclusion criteria

Exclusion Criteria:

  1. Known or suspected hypersensitivity to the active substance or to excipients of the drug XC221 or placebo
  2. Known or suspected hypersensitivity to standard therapy drugs specified in The MoH Temporary Guidelines.
  3. Body temperature ˂37.5°С.
  4. Lactase deficiency, lactose intolerance, glucose-galactose malabsorption.
  5. Presence or suspicion of oncological diseases by the day of criteria assessment or in medical history (within the last 2 years).
  6. Presence of autoimmune diseases by the day of criteria assessment or in medical history.
  7. Pregnancy.
  8. Lactation period.
  9. Presence of serious lung diseases, including, but not limited to the following diseases: moderate and severe bronchial asthma, severe and extremely severe COPD, interstitial lung disease, pulmonary hypertension, pulmonary fibrosis, surgical interventions on the lungs, tuberculosis (including suspicion of tuberculosis based on the results of CT examination at screening).
  10. Patients with type 1 diabetes mellitus and / or decompensated type 2 diabetes mellitus.
  11. Heart failure, NYHA functional class III - IV.
  12. Chronic liver failure stage II (decompensated) and higher.
  13. The need of replacement renal therapy at enrollment.
  14. Organ transplantation in medical history.
  15. Medical history of epilepsy or the need for anticonvulsant therapy.
  16. Major depressive disorder, anxiety, other mental disorders requiring medical correction.
  17. Acute cerebrovascular accident, stroke or transient ischemic attack within 90 days before screening.
  18. Use of any antiviral and / or immunomodulatory drugs after the manifestation of COVID-19.
  19. Any immunosuppressive therapy (including tocilizumab / sarilumab) within 90 days prior to randomization, or the need of immunosuppressive therapy at the time of randomization.
  20. Use of anti-COVID-19 plasma within 14 days prior to the screening visit.
  21. Use of systemic glucocorticosteroids within 90 days prior to randomization, or the need of systemic glucocorticosteroids at the time of randomization.
  22. Use of vaccines against viral infections within 90 days prior to randomization.
  23. Patients receiving other experimental drugs, drugs not approved in the Russian Federation, or participating in other clinical trials within 30 days before screening.
  24. Patients abusing alcohol or psychotropic drugs and other drugs by the day of criteria assessment or during the last year.
  25. Patients with other serious, unstable, or clinically significant medical or psychological conditions that, in the opinion of the investigator, may preclude the patient's participation in the study.
05

Study design

Phase
Phase 3
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Double (Participant, Investigator)
Enrollment
274 participants (actual)

Study arms

  • Experimental
    XC221

    XC221 100 mg orally. 1 tablet of XC221 100 mg 2 times a day during 14 full days of treatment period

    Drug: XC221

  • Placebo comparator
    Placebo

    Placebo orally. 1 tablet of Placebo 2 times a day during 14 full days of treatment period

    Drug: Placebo

Interventions

  • DrugXC221

    Participants will receive XC221 100 mg 2 times a day during 14 full days

  • DrugPlacebo

    Participants will receive Placebo 2 times a day during 14 full days

06

What researchers measure

Primary outcomes

  1. Total incidence frequency of progression to moderate COVID-19 illness or worse throughout the study (by Day 31)

    Moderate illness parameters: * Body temperature \> 37.5°C; * RR \> 22 / min; * Dyspnea during exercise; * Changes in CT (X-Ray) typical of viral disease (the volume of affected area is minimal or medium, CT 1-2); * SpO2 ˂ 95%; * Serum CRP \> 10 mg/l For the symptoms (body temperature, RR, dyspnea during exercise, SpO2, progression to moderate COVID-19 or worse), the presence of moderate progression criteria as shown by the second of two consecutive measurements.

    Time frame: Day 1 - Day 31

  2. The median time to a stable decrease in the total score on the COVID-19 Major Symptom Rating Scale to ≤ 1. A stable total score decrease is the presence of 1 point or less as shown by the second of two consecutive measurements

    The COVID-19 Major Symptom Rating Scale will be used to assess the individuals' subjective ratings the severity of 9 symptoms of COVID-19. Ranges for each symptom: 0 points (no symptoms) - 3 points (the most severe). Total score (ranges from 0 to 27 points) is a sum of points for each symptom.

    Time frame: Day 1 - Day 31

Secondary outcomes

  1. Patient rate with improvement for one or more grades of the WHO Scale by Day 2-31

    The scale of the patient's clinical condition, proposed by the WHO, will be used to assess the severity of patient general condition. Ranges for patient's clinical condition: 0 points (no infection) - 8 points (death).

    Time frame: Day 1 - Day 31

  2. Patient rate with worsening for one or more grades of the WHO Scale by Day 2-31

    The scale of the patient's clinical condition, proposed by the WHO, will be used to assess the severity of patient general condition. Ranges for patient's clinical condition: 0 points (no infection) - 8 points (death).

    Time frame: Day 1 - Day 31

  3. Mean WHO Scale grade changes from baseline by Day 2-31

    The scale of the patient's clinical condition, proposed by the WHO, will be used to assess the severity of patient general condition. Ranges for patient's clinical condition: 0 points (no infection) - 8 points (death).

    Time frame: Day 1 - Day 31

  4. Patient rate with SpO2 ≤ 93% by Day 2-31

    Time frame: Day 1 - Day 31

  5. Patient rate with SpO2 ˂ 95% by Day 2-31

    Time frame: Day 1 - Day 31

  6. Mean change from baseline in SpO2 by Day 2-31

    Time frame: Day 1 - Day 31

  7. Patient rate with RR > 22/min by Days 3, 6, 9, 12 and 15

    Time frame: Day 1 - Day 15

  8. Patient rate with RR > 30/min by Days 3, 6, 9, 12 and 15

    Time frame: Day 1 - Day 15

  9. Patient rate with RR ≤ 20/min by Days 3, 6, 9, 12 and 15

    Time frame: Day 1 - Day 15

  10. Mean change from baseline in RR by Days 3, 6, 9, 12 and 15

    Time frame: Day 1 - Day 15

  11. Patient rate with a body temperature ≤ 37.0°С by Day 2-31

    Time frame: Day 1 - Day 31

  12. Patient rate with a body temperature ≤ 37.5°С by Day 2-31

    Time frame: Day 1 - Day 31

  13. Patient rate with a body temperature ≥ 38.5°С by Day 2-31

    Time frame: Day 1 - Day 31

  14. Mean change from baseline in body temperature by Day 2-31

    Time frame: Day 1 - Day 31

  15. Patient rate with a score ≤ 1 according to the Daytime and Nighttime Cough Scale by Day 2-31

    Time frame: Day 1 - Day 31

  16. Mean score change from baseline in the Daytime and Nighttime Cough Scale by Day 2-31

    The Daytime and Nighttime Cough Scale will be used to assess the dynamics of cough during the study. Ranges for assess: 0 points (no cough) - 5 points (cough that prevents sleep).

    Time frame: Day 1 - Day 31

  17. Average time to reach ≤ 1 score according to the Daytime and Nighttime Cough.

    The Daytime and Nighttime Cough Scale will be used to assess the dynamics of cough during the study. Ranges for assess: 0 points (no cough) - 5 points (cough that prevents sleep).

    Time frame: Day 1 - Day 31

  18. Patient rate with decrease for one or more grades for each symptom according to the COVID-19 Major Symptom Rating Scale by Day 2-31

    The COVID-19 Major Symptom Rating Scale will be used to assess the individuals' subjective ratings the severity of 9 symptoms of COVID-19. Ranges for each symptom: 0 points (no symptoms) - 3 points (the most severe). Total score (ranges from 0 to 27 points) is a sum of points for each symptom.

    Time frame: Day 1 - Day 31

  19. Patient rate with clinical improvement (1 point or less) for each symptom according to the COVID-19 Major Symptom Rating Scale

    The COVID-19 Major Symptom Rating Scale will be used to assess the individuals' subjective ratings the severity of 9 symptoms of COVID-19. Ranges for each symptom: 0 points (no symptoms) - 3 points (the most severe). Total score (ranges from 0 to 27 points) is a sum of points for each symptom.

    Time frame: Day 1 - Day 31

  20. Time till clinical improvement (1 point or less) for each symptom according to the COVID-19 Major Symptom Rating Scale

    The COVID-19 Major Symptom Rating Scale will be used to assess the individuals' subjective ratings the severity of 9 symptoms of COVID-19. Ranges for each symptom: 0 points (no symptoms) - 3 points (the most severe). Total score (ranges from 0 to 27 points) is a sum of points for each symptom.

    Time frame: Day 1 - Day 31

  21. Patient rate with a grade ≤ 1 for each symptom according to the COVID-19 Major Symptom Rating Scale by Day 2-31

    The COVID-19 Major Symptom Rating Scale will be used to assess the individuals' subjective ratings the severity of 9 symptoms of COVID-19. Ranges for each symptom: 0 points (no symptoms) - 3 points (the most severe). Total score (ranges from 0 to 27 points) is a sum of points for each symptom.

    Time frame: Day 1 - Day 31

  22. Mean score change from baseline for each symptom according to the COVID-19 Major Symptom Rating Scale by Day 2-31

    The COVID-19 Major Symptom Rating Scale will be used to assess the individuals' subjective ratings the severity of 9 symptoms of COVID-19. Ranges for each symptom: 0 points (no symptoms) - 3 points (the most severe). Total score (ranges from 0 to 27 points) is a sum of points for each symptom.

    Time frame: Day 1 - Day 31

  23. Average time to reach ≤ 1 score for each symptom according to the COVID-19 Major Symptom Rating Scale

    The COVID-19 Major Symptom Rating Scale will be used to assess the individuals' subjective ratings the severity of 9 symptoms of COVID-19. Ranges for each symptom: 0 points (no symptoms) - 3 points (the most severe). Total score (ranges from 0 to 27 points) is a sum of points for each symptom.

    Time frame: Day 1 - Day 31

  24. Patient rate with a grade ≤ 1 according to the Dyspnea Visual Analogue Scale by Day 2-31

    The Dyspnea Visual Analogue Scale will be used to assess the severity of dyspnea. The scale has five numerical values, rated from 0 (no shortness of breath) to 4 (very severe shortness of breath).

    Time frame: Day 1 - Day 31

  25. Mean score change from baseline according to the Dyspnea Visual Analogue Scale by Day 2-31

    The Dyspnea Visual Analogue Scale will be used to assess the severity of dyspnea. The scale has five numerical values, rated from 0 (no shortness of breath) to 4 (very severe shortness of breath).

    Time frame: Day 1 - Day 31

  26. Average time to reach ≤ 1 score according to the Dyspnea Visual Analogue Scale

    The Dyspnea Visual Analogue Scale will be used to assess the severity of dyspnea. The scale has five numerical values, rated from 0 (no shortness of breath) to 4 (very severe shortness of breath).

    Time frame: Day 1 - Day 31

  27. Patient rate with a negative SARS-CoV-2 test result by Day 3, 9, 15, also by Day 7 and Day 15 after the end of drug administration (in the case of a positive previous test result)

    Time frame: Day 1 - Day 31

  28. Time till elimination SARS-CoV-2

    Time frame: Day 1 - Day 31

  29. Mean CRP concentration change from baseline by Day 15

    Time frame: Day 1 - Day 15

07

Study locations

11 sites
  • Municipal Budgetary Institution of Healthcare "Central City Hospital of Novoshakhtinsk"
    Novoshakhtinsk, Rostov Region 346918, Russian Federation
  • LLC "Family Clinic"
    Ekaterinburg, 620000, Russian Federation
  • Regional Budgetary Institution of Healthcare "Ivanovskaya Clinical Hospital named after Kuvaevykh"
    Ivanovo, 153025, Russian Federation
  • State Budgetary Institution of Healthcare of Moscow "City Polyclinic No. 2 of the Moscow Department of Healthcare"
    Moscow, 117556, Russian Federation
  • Federal Budgetary Institution of Science "Moscow Research Institute of Epidemiology and Microbiology named after G.N. Gabrichevsky" of the Federal Service for the Oversight of Consumer Protection and Welfare
    Moscow, 125212, Russian Federation
  • Limited Liability Company "Medical Center "Capital-Policy"
    Saint Petersburg, 190013, Russian Federation
  • Limited Liability Company "Research Center Eco-Safety"
    Saint Petersburg, 196143, Russian Federation
  • LLC "Sphere-Med"
    Saint Petersburg, 197342, Russian Federation
  • Saint Petersburg State Budgetary Institution of Healthcare "City Pokrovskaya Hospital" (4th Cardiology Department)
    Saint Petersburg, 199106, Russian Federation
  • Saint Petersburg State Budgetary Institution of Healthcare "City Polyclinic No. 4"
    Saint Petersburg, 199178, Russian Federation
  • Regional State Budgetary Institution of Healthcare "Medical-Sanitary Unit No. 2"
    Tomsk, 634040, Russian Federation
08

References and documents

Individual participant data

Plan to share: No

No publications or documents are linked to this record.

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Jul 27, 2023, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT04940182
Lead sponsor
RSV Therapeutics LLC
Responsible party
Sponsor
First posted
Jun 25, 2021
Start date
Jun 26, 2021
Primary completion
Aug 26, 2022
Completion
Nov 14, 2022
Last update
Jul 27, 2023

Oversight

Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Jul 2023. You cannot join it, but the record below documents what was studied.

Follow this study

Get an email when the registry record changes — status, dates, results — or when someone posts here.

Sign in to follow

Discussion

Questions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.

Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.

Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.

Other studies in this condition

COVID-19→

Other studies from this sponsor

RSV Therapeutics LLC

Start the discussion