Overview
Sponsor-declared trial summary
Prevention of Respiratory syncytial virus (RSV) infection in infants and children at increased risk for severe RSV disease
To evaluate the safety and tolerability of clesrovimab (MK-1654) compared to palivizumab in respiratory syncytial virus (RSV) Season 1 as assessed by the proportion of participants experiencing AEs.
Key facts
- Sponsor
- Merck Sharp & Dohme LLC
- Participant type
- Pediatric, Patients, Healthy volunteers
- Age range
- 0-17 years
- Gender
- Male and Female
- Therapeutic area
- Diseases [C] - Virus Diseases [C02]
- Trial duration
- 25 Nov 2021 → 16 Oct 2025
- Decision date (initial)
- 2023-06-14
- Transition trial
- Yes
- Low-intervention
- No
- Rare-disease indication
- No
- Vulnerable population
- Yes
- Funding sources
- Merck Sharp & Dohme LLC
External identifiers
- EU CT number
- 2022-500752-39-00
- EudraCT number
- 2020-005996-11
- WHO UTN
- U1111-1278-0093
- ClinicalTrials.gov
- NCT04938830
Trial design
CTIS Part I — objectives, methods, condition coding
Main objective
Scope: Prophylaxis, Pharmacokinetic, Pharmacodynamic, Safety, Efficacy
To evaluate the safety and tolerability of clesrovimab (MK-1654) compared to palivizumab in respiratory syncytial virus (RSV) Season 1 as assessed by the proportion of participants experiencing AEs.
Secondary objectives 5
- To estimate the efficacy of clesrovimab compared to palivizumab as assessed by the incidence of RSV-associated medically attended lower respiratory infection (MALRI) (outpatient and inpatient) from Days 1 through 150 post Dose 1 in RSV Season 1.
- To estimate the incidence of RSV-associated hospitalizations from Days 1 through 150 post Dose 1 in RSV Season 1 in the clesrovimab and palivizumab groups.
- To describe the serum PK concentration of clesrovimab at Days 7, 150, and 240 after the dose of clesrovimab in RSV Season 1.
- To describe the safety of clesrovimab administered in RSV Season 2 as assessed by the proportion of participants experiencing AEs.
- To describe the serum PK concentration of clesrovimab at Days 7 and 150 postdose in RSV Season 2.
Conditions and MedDRA coding
Prevention of Respiratory syncytial virus (RSV) infection in infants and children at increased risk for severe RSV disease
| Version | Level | Code | Term | System organ class |
|---|---|---|---|---|
| 21.1 | LLT | 10066742 | Respiratory syncytial virus infection prophylaxis | 10042613 |
Regulatory references
- Scientific advice from competent authorities
- European Medicines Agency
- EMA paediatric investigation plan (PIP)
- EMEA-002755-PIP01-19
- Plan to share IPD
- No
Eligibility criteria
Principal inclusion / exclusion criteria as submitted by sponsor
Inclusion criteria 3
- Participants at increased risk for severe respiratory syncytial virus (RSV) infection recommended to receive palivizumab in accordance with national or local guidelines or professional society recommendations.
- Is available to complete the follow-up period.
- Is male or female and has a chronological age from birth up to 1 year and is entering their first RSV season.
Exclusion criteria 6
- Requires mechanical ventilation at time of enrollment.
- Has a life expectancy <6 months.
- Has known hepatic or renal dysfunction, or chronic seizure disorder.
- Is hospitalized at the time of randomization unless discharge is expected within 7 days after randomization.
- Has severe immunodeficiency or is severely immunocompromised.
- Has known hypersensitivity to any component of clesrovimab or palivizumab.
Endpoints
Primary and secondary outcome measures (English text)
Primary endpoints 7
- Percentage of participants with solicited injection-site Adverse Events (AEs) in respiratory syncytial virus (RSV) Season 1
- Percentage of participants with solicited daily body temperature with fever in RSV Season 1
- Percentage of participants with solicited systemic AEs in RSV Season 1
- Percentage of participants with anaphylaxis/hypersensitivity AEs of special interest (AESI) in RSV Season 1
- Percentage of participants with rash AESI in RSV Season 1
- Percentage of participants with non-serious AEs in RSV Season 1
- Percentage of participants with serious AEs (SAEs) through the duration of participation in RSV Season 1
Secondary endpoints 11
- Percentage of participants with RSV-associated medically attended lower respiratory infection (MALRI) in RSV Season 1
- Percentage of participants with RSV-associated hospitalization in RSV Season 1
- Percentage of participants with solicited injection-site AEs in RSV Season 2
- Percentage of participants with solicited daily body temperature with fever in RSV Season 2
- Percentage of participants with solicited systemic AEs in RSV Season 2
- Percentage of participants with anaphylaxis/hypersensitivity AESI in RSV Season 2
- Percentage of participants with rash AESI in RSV Season 2
- Percentage of participants with non-serious AEs in RSV Season 2
- Percentage of participants with SAEs through 180 days postdose in RSV Season 2
- Serum concentration of clesrovimab (MK-1654) after dose of clesrovimab in RSV Season 1
- Serum concentration of clesrovimab after dose of clesrovimab in RSV Season 2
Investigational products
Investigational medicinal products (IMPs), comparators, placebo, auxiliary
Test 1
PRD9355634 · Product
- Active substance
- Clesrovimab
- Pharmaceutical form
- SOLUTION FOR INJECTION
- Route of administration
- INTRAMUSCULAR
- Max daily dose
- 210 mg milligram(s)
- Max total dose
- 315 mg milligram(s)
- Max treatment duration
- 60 Day(s)
- Authorisation status
- Not Authorised
- MA holder
- MERCK & CO. INC.
- Paediatric formulation
- No
- Orphan designation
- No
Comparator 1
Synagis 100 mg/1 ml solution for injection
PRD8843559 · Product
- Active substance
- Palivizumab
- Pharmaceutical form
- SOLUTION FOR INJECTION
- Route of administration
- INTRAMUSCULAR
- Max daily dose
- 15 mg/Kg milligram(s)/kilogram
- Max total dose
- 75 mg/Kg milligram(s)/kilogram
- Max treatment duration
- 120 Day(s)
- Authorisation status
- Authorised
- ATC code
- J06BB16 — PALIVIZUMAB
- Marketing authorisation
- EU/1/99/117/004
- MA holder
- ASTRAZENECA AB
- MA country
- EU
- Paediatric formulation
- No
- Orphan designation
- No
- Modified vs. Marketing Authorisation
- No
Placebo 2
Isotone Natriumchloridlösung 0,9 % Braun Injektionslösung
PRD567881 · Product
- Active substance
- Sodium Chloride
- Pharmaceutical form
- SOLUTION FOR INJECTION
- Route of administration
- INTRAMUSCULAR
- Max daily dose
- 0 mg milligram(s)
- Max total dose
- 0 mg milligram(s)
- Max treatment duration
- 60 Day(s)
- Authorisation status
- Authorised
- ATC code
- V07AB — SOLVENTS AND DILUTING AGENTS, INCL. IRRIGATING SOLUTIONS
- Marketing authorisation
- 6697366.00.00 (ENR 0697366)
- MA holder
- B.BRAUN MELSUNGEN AG
- MA country
- Germany
- Paediatric formulation
- No
- Orphan designation
- No
- Modified vs. Marketing Authorisation
- No
Placebo to MK-1654 - Saline for injection
N/A · Product
- Other product name
- N/A
- Pharmaceutical form
- N/A
- ATC code
- N/A — N/A
- Marketing authorisation
- N/A
- MA holder
- N/A
- MA country
- Iceland
- Paediatric formulation
- No
Sponsors and contacts
Sponsor organisations, regulatory contacts, third parties
Merck Sharp & Dohme LLC
- Sponsor organisation
- Merck Sharp & Dohme LLC
- Address
- 1 Merck Drive, P. O. Box 100 P. O. Box 100
- City
- Whitehouse Station
- Postcode
- 08889-3400
- Country
- United States
Scientific contact point
- Organisation
- Merck Sharp & Dohme LLC
- Contact name
- Luis Castagnini
Public contact point
- Organisation
- Merck Sharp & Dohme LLC
- Contact name
- Luis Castagnini
Third parties 11
| Organisation | City, country | Duties |
|---|---|---|
| Bioclinica Inc. ORG-100033079
|
Princeton, United States | Other |
| PPD Global Central Labs ORG-100046496
|
Zaventem, Belgium | Other |
| WCG Clinical Inc. ORG-100040730
|
Princeton, United States | Other |
| Fortrea Inc. ORG-100012602
|
Durham, United States | Other |
| Medidata Solutions Inc. ORG-100016256
|
New York, United States | E-data capture |
| Pharma Medica Research Inc. ORG-100011951
|
Mississauga, Canada | Laboratory analysis |
| Labcorp Endpoint Clinical Inc. ORG-100040567
|
Wakefield, United States | Interactive response technologies (IRT) |
| Parexel International Corp. ORG-100007310
|
Auburndale, United States | Other |
| Parexel International Corp. ORG-100007310
|
Auburndale, United States | Other |
| Eurofins Viracor Biopharma Services LLC ORG-100041736
|
Lenexa, United States | Laboratory analysis |
| Matthews Media Group Inc. ORG-100045638
|
Rockville, United States | Code 2 |
Locations
9 EU/EEA countries · 44 investigational sites
By country
| Country | MS status | Planned subjects | Sites |
|---|---|---|---|
| Czechia | Ended | 24 | 3 |
| Finland | Ended | 25 | 6 |
| France | Ended | 20 | 3 |
| Germany | Ended | 67 | 4 |
| Greece | Ended | 26 | 4 |
| Hungary | Ended | 65 | 8 |
| Italy | Ended | 25 | 5 |
| Norway | Ended | 5 | 1 |
| Spain | Ended | 60 | 10 |
| Rest of world
New Zealand, Malaysia, Mexico, Turkey, Canada, Chile, Puerto Rico, Thailand, Australia, Japan, Taiwan, United Kingdom, Colombia, United States, South Africa, Singapore, Peru
|
— | 619 | — |
Investigational sites
Country notifications
Trial-start, recruitment-start, end and early-termination notifications submitted per Member State
| Country | Trial start | Trial end | Recruitment start | Recruitment end | Early termination |
|---|---|---|---|---|---|
| Czechia | 2022-10-26 | 2025-04-22 | 2022-10-31 | 2024-01-26 | |
| Finland | 2021-12-08 | 2024-12-09 | 2021-12-10 | 2024-03-15 | |
| France | 2021-12-02 | 2024-04-10 | 2021-12-08 | 2023-01-24 | |
| Germany | 2021-12-13 | 2024-12-20 | 2021-12-30 | 2023-12-19 | |
| Greece | 2022-03-29 | 2025-06-02 | 2022-09-15 | 2024-02-20 | |
| Hungary | 2021-11-26 | 2024-11-20 | 2021-12-02 | 2024-01-26 | |
| Italy | 2022-08-31 | 2025-05-12 | 2022-11-11 | 2024-03-02 | |
| Norway | 2021-12-23 | 2025-04-28 | 2022-01-07 | 2024-05-08 | |
| Spain | 2021-11-25 | 2024-04-15 | 2021-11-30 | 2023-01-25 |
Results and documents
Annex IV summary of results, Annex V layperson summary, and all documents registered in CTIS for this trial
Summary of results Art. 37(4) CTR
| Title | Submission date | Status | Type |
|---|---|---|---|
| MK-1654-007 Summary of Results SUM-127736
|
2026-04-07T14:58:57 | Submitted | Summary of Results |
Layperson summary Annex V
| Title | Submission date | Status | Type |
|---|---|---|---|
| Results Plain Language Summaries | 2026-04-07T14:59:45 | Submitted | Laypersons Summary of Results |
Documents 92 files
Public protocol annexes, IB summaries, regulatory submissions and post-authorisation documents registered in CTIS.
| Type | Title | Version |
|---|---|---|
| Clinical study report (for publication) | m5351-p007pv01mk1654-p-app1619-sap | 01 |
| Clinical study report (for publication) | m5351-p007v01mk1654-p-app1611-protocol | 01 |
| Clinical study report (for publication) | m5351-p007v01mk1654-p-app1612-crf | 1 |
| Clinical study report (for publication) | m5351-p007v01mk1654-p-csr-body | 01 |
| Laypersons summary of results (for publication) | RPLS_CZE_CZ_for pub | 09MAR2026 |
| Laypersons summary of results (for publication) | RPLS_DEU_DE_for pub | 09MAR2026 |
| Laypersons summary of results (for publication) | RPLS_EN_for pub | 09MAR2026 |
| Laypersons summary of results (for publication) | RPLS_ESP_ES_for pub | 09MAR2026 |
| Laypersons summary of results (for publication) | RPLS_FIN_FI_for pub | 09MAR2026 |
| Laypersons summary of results (for publication) | RPLS_FRA_FR_for pub | 09MAR2026 |
| Laypersons summary of results (for publication) | RPLS_GRC_EL_for pub | 09MAR2026 |
| Laypersons summary of results (for publication) | RPLS_HUN_HU_for pub | 09MAR2026 |
| Laypersons summary of results (for publication) | RPLS_ITA_IT_for pub | 09MAR2026 |
| Laypersons summary of results (for publication) | RPLS_NOR_NN_for pub | 09MAR2026 |
| Protocol (for publication) | D1_Protocol_2022-500752-39_GRC_EL_SM06_for pub | 03R |
| Protocol (for publication) | D1_Protocol_2022-500752-39-00_SM06_for pub | 3R |
| Protocol (for publication) | D4_Subject questionnaire_DEU_DE_for pub | 1.0 |
| Protocol (for publication) | D4_Subject questionnaire_for pub | 13SEP2021 |
| Protocol (for publication) | D4_Subject questionnaire_FRA_FR_for pub | 1 |
| Protocol (for publication) | D4_Subject questionnaire_FRA_FR_for pub | 4.0 |
| Protocol (for publication) | D4_Subject questionnaire_HUN_HU_for pub | 1.0 |
| Protocol (for publication) | D4_Subject questionnaire_ITA_IT_for pub | 01 |
| Protocol (for publication) | D4_Subject Questionnaire_NOR_eCOA Screen Report_NN_for pub | 1.0 |
| Protocol (for publication) | D4_Subject Questionnaire_NOR_Study Participant User Guide_NN_for pub | 1.0 |
| Protocol (for publication) | D4_Subject questionnaire_Screen Report_GRC_EL_for pub | 2.0 |
| Protocol (for publication) | D4_Subject questionnaire_User Guide_ITA_IT_for pub | v2 |
| Protocol (for publication) | D4_User guide_DEU_DE_for pub | 2.0 |
| Protocol (for publication) | D4_User Guide_HUN_HU_for pub | 1.0 |
| Protocol (for publication) | D4_User guidefor for pub | 2.0 |
| Protocol (for publication) | Subject Questionnaire_CZE_Device Label_Czech_for publication | 1 |
| Protocol (for publication) | Subject Questionnaire_CZE_eCOA Screen Report_Czech_for publication | 2 |
| Protocol (for publication) | Subject Questionnaire_CZE_Study Participant User Guide_Czech_for publication | 2 |
| Recruitment arrangements (for publication) | K1_Recruitment Arrangements and IC Procedure_DEU_EN_for pub | 1.0 |
| Recruitment arrangements (for publication) | K1_Recruitment Arrangements and IC Procedure_FIN_for pub | 20JUL2021 |
| Recruitment arrangements (for publication) | K1_Recruitment Arrangements and IC Procedure_ITA_EN_for pub | v1.0 |
| Recruitment arrangements (for publication) | K1_Recruitment Arrangements Letter of Invitation_CZE_CS_not pub | 1.0 |
| Recruitment arrangements (for publication) | K2_Recruitment Arrangements AESI Card_CZE_Czech_for publication | 1.0 |
| Recruitment arrangements (for publication) | K2_Recruitment Arrangements Appoitment Reminder Card_CZE_Czech_for publication | 1.0 |
| Recruitment arrangements (for publication) | K2_Recruitment Arrangements Brochure_CZE_Czech_for publication | 1.0 |
| Recruitment arrangements (for publication) | K2_Recruitment Arrangements CRIS Card_CZE_Czech_for publication | 1.0 |
| Recruitment arrangements (for publication) | K2_Recruitment Arrangements High-risk Brochure_CZE_Czech_for publication | 1.0 |
| Recruitment arrangements (for publication) | K2_Recruitment Arrangements High-risk Poster_CZE_Czech_for publication | 1.0 |
| Recruitment arrangements (for publication) | K2_Recruitment Arrangements Patient Visit Guide_CZE_Czech_for publication | 1.0 |
| Recruitment arrangements (for publication) | K2_Recruitment Arrangements Physician Referral Flyer_CZE_Czech_for publication | 1.0 |
| Recruitment arrangements (for publication) | K2_Recruitment Arrangements Poster_CZE_Czech_for publication | 1.0 |
| Recruitment arrangements (for publication) | K2_Recruitment Doc Brochure_CZE_CS_SM06_for pub | 1.0 |
| Recruitment arrangements (for publication) | K2_Recruitment Doc hrisk Poster_ITA_IT_for pub | 1.1 |
| Recruitment arrangements (for publication) | K2_Recruitment Doc Patient Brochure_DEU_DE_for pub | 1.0 |
| Recruitment arrangements (for publication) | K2_Recruitment Doc Patient Brochure_ITA_IT_for pub | 1.1 |
| Recruitment arrangements (for publication) | K2_Recruitment Doc Patient Flyer_CZE_CS_SM06_for pub | 1.0 |
| Recruitment arrangements (for publication) | K2_Recruitment Doc Patient hrisk Brochure_ITA_IT_for pub | 1.1 |
| Recruitment arrangements (for publication) | K2_Recruitment Doc Physician Referral Flyer_DEU_DE_for pub | 1.0 |
| Recruitment arrangements (for publication) | K2_Recruitment Doc Poster_DEU_DE_for pub | 01Dec2021 |
| Recruitment arrangements (for publication) | K2_Recruitment Doc Poster_ITA_IT_for pub | 1.1 |
| Subject information and informed consent form (for publication) | L1_ICF_FBR consent_DEU_EN_for pub | 0.1 |
| Subject information and informed consent form (for publication) | L1_ICF_FBR consent_FIN_EN_for pub | 01 |
| Subject information and informed consent form (for publication) | L1_ICF_FBR consent_FIN_FI_for pub | 01 |
| Subject information and informed consent form (for publication) | L1_ICF_FBR consent_FIN_SV_for pub | 01 |
| Subject information and informed consent form (for publication) | L1_ICF_FBR consent_ITA_IT_for pub | v01 |
| Subject information and informed consent form (for publication) | L1_ICF_FBR data privacy_ITA_IT_for pub | 02AUG2023 |
| Subject information and informed consent form (for publication) | L1_ICF_FBR parent consent_DEU_DE_for pub | 1.0R |
| Subject information and informed consent form (for publication) | L1_ICF_FBR parent_CZE_Czech_for publication | 14SEP2022 |
| Subject information and informed consent form (for publication) | L1_ICF_Main consent_DEU_EN_for pub | AM01v1.02 |
| Subject information and informed consent form (for publication) | L1_ICF_Main consent_FIN_EN_for pub | AM01v1.02 |
| Subject information and informed consent form (for publication) | L1_ICF_Main consent_FIN_FI_for pub | 1.04R |
| Subject information and informed consent form (for publication) | L1_ICF_Main consent_FIN_SV_for pub_ | AM01v1.02 |
| Subject information and informed consent form (for publication) | L1_ICF_Main consent_ITA_IT_SM06_for pub | AM01v1.04 |
| Subject information and informed consent form (for publication) | L1_ICF_Main data privacy_ITA_IT_SM06_for pub | 15OCT2024 |
| Subject information and informed consent form (for publication) | L1_ICF_Main GDPR_CZE_czech_for publication | 01MAY2022 |
| Subject information and informed consent form (for publication) | L1_ICF_Main parent consent_DEU_DE_for pub | 1.4R |
| Subject information and informed consent form (for publication) | L1_ICF_Main parent CZE_CS_for pub | Czech v5R |
| Subject information and informed consent form (for publication) | L1_ICF_Optional_add reimbursement_DEU_DE_for pub | 18AUG2023R |
| Subject information and informed consent form (for publication) | L1_Patient ID Card_CZE_CS_for pub | 1.0.1.2R |
| Summary of Product Characteristics (SmPC) (for publication) | G2_SmPC Q and RSI_Palivizumab_for pub | 18APR2023 |
| Summary of results (for publication) | Summary of Results_2022-500752-39_for pub | 1.0 |
| Synopsis of the protocol (for publication) | D1_PPLS_CZE_CS_2022-500752-39_for pub | 1.0 |
| Synopsis of the protocol (for publication) | D1_PPLS_DEU_DE_2022-500752-39_for pub | 1.0 |
| Synopsis of the protocol (for publication) | D1_PPLS_EN_2022-500752-39-00_for pub | 1.0 |
| Synopsis of the protocol (for publication) | D1_PPLS_ESP_ES_2022-500752-39-00_for pub | 1.0 |
| Synopsis of the protocol (for publication) | D1_PPLS_FRA_FR_2022-500752-39_for pub | 1.0 |
| Synopsis of the protocol (for publication) | D1_PPLS_GRC_EL_2022-500752-39-00_for pub | 31Jul2023 |
| Synopsis of the protocol (for publication) | D1_PPLS_HUN_HU_2022-500752-39_for pub | 1.0 |
| Synopsis of the protocol (for publication) | D1_PPLS_ITA_IT_2022-500752-39_for pub | 1.0 |
| Synopsis of the protocol (for publication) | D1_PPLS_NOR_NN_2022-500752-39_for pub | 1.0 |
| Synopsis of the protocol (for publication) | D1_Protocol Scientific Synopsis_CZE_Czech_for publication | 06JUN2022 |
| Synopsis of the protocol (for publication) | D1_Protocol Scientific Synopsis_DEU_DE_for pub | 00 |
| Synopsis of the protocol (for publication) | D1_Protocol scientific synopsis_ESP_Spanish_for publication | 02 |
| Synopsis of the protocol (for publication) | D1_Protocol Scientific Synopsis_GRC_EL_2022-500752-39-00 | 2 |
| Synopsis of the protocol (for publication) | D1_Protocol Scientific Synopsis_GRC_EL_for pub | 02 |
| Synopsis of the protocol (for publication) | D1_Protocol Scientific Synopsis_HUN_HU_for pub | 1.0 |
| Synopsis of the protocol (for publication) | D1_Protocol Scientific Synopsis_ITA_IT_for pub | 02 |
| Synopsis of the protocol (for publication) | D1_Protocol synopsis layman language_FRA_French_for publication | 3.0 |
Application history
9 submissions — initial application plus substantial / non-substantial modifications
| # | Type | Code | Submitted | Reference MS | Conclusion | Decision date |
|---|---|---|---|---|---|---|
| 1 | INITIAL | IN | 2023-03-31 | Finland | Acceptable 2023-05-17
|
2023-05-22 |
| 2 | SUBSTANTIAL MODIFICATION | SM-1 | 2023-09-11 | Finland | Acceptable 2023-11-13
|
2023-11-13 |
| 3 | SUBSTANTIAL MODIFICATION | SM-2 | 2023-12-23 | Acceptable | 2024-02-19 | |
| 4 | SUBSTANTIAL MODIFICATION | SM-3 | 2024-02-12 | Acceptable | 2024-05-08 | |
| 5 | NON SUBSTANTIAL MODIFICATION | NSM-1 | 2024-05-08 | Finland | 2024-05-08 | |
| 6 | NON SUBSTANTIAL MODIFICATION | NSM-2 | 2024-07-04 | Finland | 2024-07-04 | |
| 7 | NON SUBSTANTIAL MODIFICATION | NSM-3 | 2024-09-20 | 2024-09-20 | ||
| 8 | SUBSTANTIAL MODIFICATION | SM-6 | 2024-11-22 | Finland | Acceptable 2025-02-10
|
2025-02-11 |
| 9 | SUBSTANTIAL MODIFICATION | SM-7 | 2025-03-14 | Acceptable 2025-05-30
|
2025-05-30 |