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AR51

Phase 2

Bacterial Infections; Virus Diseases | Monoclonal antibody | Infectious Disease |Merck & Company, Inc.|Trials Updated: Oct 30, 2015

Success Probability

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Trial Design

RandomizedDouble-BlindCONTROLLEDDMC
Total Trials2
Total Enrollment1,464

FDA Designations

No designations recorded

AR51 clinical trials

AR51 · 2 trials · 1 indication

Phase 2 2
NCT00551629A Study to Test the Safety and Effectiveness of an Investigational Vaccine in Infants (V419-002)Bacterial Infections; Virus Diseases
COMPLETED708 Analytics
NCT00551915A Study of the Safety and Tolerability of V419 in Healthy Infants at 2,4, 6 and 12 to 14 Months of Age (V419-003)Bacterial Infections; Virus Diseases
COMPLETED756 Analytics
PHASE2COMPLETED
A Study to Test the Safety and Effectiveness of an Investigational Vaccine in Infants (V419-002)
Bacterial Infections; Virus DiseasesUnlock trial analytics
PHASE2COMPLETED
A Study of the Safety and Tolerability of V419 in Healthy Infants at 2,4, 6 and 12 to 14 Months of Age (V419-003)
Bacterial Infections; Virus DiseasesUnlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of participants with level of anti-PRP antibodies >1.0 μg/mL at the Postdose 3 time point
At 5 months of age (1 month after 3rd vaccination)
Percentage of participants with level of anti-HBsAg antibodies ≥10 mIU/L at the Postdose 3 time point
At 5 months of age (1 month after 3rd vaccination)
Percentage of participants with a ≥4-fold rise in levels of antibodies to pertussis antigens (toxoid [PTxd], Filamentous Hemagglutinin [FHA], Fimbria 2 & Fimbria 3 [FIM], and Pertactin [PRN]) at the Postdose 3 time point
At 5 months of age (1 month after 3rd vaccination)
Percentage of participants with level of anti-diphtheria antibodies ≥0.01 IU/mL at the Postdose 3 time point
At 5 months of age (1 month after 3rd vaccination)
Percentage of participants with level of anti-tetanus antibodies ≥0.01 IU/mL at the Postdose 3 time point
At 5 months of age (1 month after 3rd vaccination)
Percentage of participants with neutralizing anti-poliovirus antibodies (Types 1, 2, and 3) at ≥1:8 dilution at the Postdose 3 time point
At 5 months of age (1 month after 3rd vaccination)
Percentage of participants with a ≥4-fold rise in levels of antibodies to pertussis antigens at the Postdose 3 time point
At 7 months of age (1 month after 3rd vaccination)
Percentage of participants with neutralizing anti-poliovirus type antibodies at ≥1:8 dilution at the Postdose 3 time point
At 7 months of age (1 month after 3rd vaccination)

Secondary Endpoints

Number of participants with at least 1 adverse event (AE)
From 1st vaccination up to 14 days following last vaccination (up to 14.5 months)
Number of participants who discontinued study treatment due to an AE
From 1st vaccination up to 14 days following last vaccination (up to 14.5 months)
Percentage of participants with level of anti-PRP antibodies >1.0 μg/mL at the Postdose 2 time point
At 6 months of age (2 months after 2nd vaccination)
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
AR51 (12, 10)EXPERIMENTALParticipants were vaccinated with 0.5 ml of AR51 (12, 10) formulation via intramuscular injection as a primary series at 2, 3, and 4 months of age, and as a booster at 12 to 14 months of age.
PR51 (3, 10)EXPERIMENTALParticipants were vaccinated with 0.5 ml of PR51 (3, 10) formulation via intramuscular injection as a primary series at 2, 3, and 4 months of age, and as a booster at 12 to 14 months of age.
PR51 (6, 10)EXPERIMENTALParticipants were vaccinated with 0.5 ml of PR51 (6, 10) formulation via intramuscular injection as a primary series at 2, 3, and 4 months of age, and as a booster at 12 to 14 months of age.
PR51 (6, 15)EXPERIMENTALParticipants were vaccinated with 0.5 ml of PR51 (6, 15) formulation via intramuscular injection as a primary series at 2, 3, and 4 months of age, and as a booster at 12 to 14 months of age.
PENTACEL™ + RECOMBIVAX HB™ACTIVE_COMPARATORParticipants were vaccinated with 0.5 ml each of PENTACEL™ + RECOMBIVAX HB™ via intramuscular injection as a primary series at 2, 4, and 6 months of age, and with 0.5 ml PENTACEL™ as a booster at 12 to 14 months of age.

Interventions

NameTypeDescription
AR51 (12, 10)BIOLOGICALvaccine formulation containing 12 mcg of PRP-T and 10 mcg of HBsAg
PR51 (3, 10)BIOLOGICALvaccine formulation containing 3 mcg of PRP-OMPC and 10 mcg of HBsAg
PR51 (6, 10)BIOLOGICALvaccine formulation containing 6 mcg of PRP-OMPC and 10 mcg of HBsAg
PR51 (6, 15)BIOLOGICALvaccine formulation containing 6 mcg of PRP-OMPC and 15 mcg of HBsAg
PENTACEL™BIOLOGICALlicensed vaccine for diphtheria, tetanus, pertussis, poliomyelitis, and invasive disease due to Haemophilus influenzae type b, administered open-label
RECOMBIVAX HB™BIOLOGICALlicensed vaccine for hepatitis, administered open-label
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Eligibility Criteria

Age Range6 Weeks to 9 Weeks
SexALL
Healthy VolunteersYes

Inclusion Criteria: * Healthy infants 2 months of age who have not received prior vaccinations for Haemophilus influenzae type b (Hib), hepatitis B, Diptheria/Pertussis/Tetanus (DPT), or Polio Exclusion Criteria : * Documented HIV infection (child or mother) * Documented HBsAg-seropositivity (chi...

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Frequently asked questions about AR51

What is AR51?

AR51 is an investigational monoclonal antibody being developed by Merck & Company, Inc. (MRK) for bacterial infections and virus diseases. It is in Phase 2 clinical development and has been studied in two completed trials enrolling a total of 1,464 participants. AR51 is not approved and remains an investigational product.

What is AR51 used for?

AR51 is being studied for bacterial infections and virus diseases. Both completed Phase 2 trials enrolled healthy infants from 6 weeks of age, evaluating AR51 in a pediatric preventive setting. The trials were randomized, double-blind, and controlled, with 1,464 participants enrolled across the two studies.

Who makes AR51?

AR51 is developed by Merck & Company, Inc., which trades under the ticker MRK. Merck sponsored both Phase 2 trials of AR51 in healthy infants, one enrolling 756 participants and the other 708 participants, for a combined total of 1,464 participants.

What phase is AR51 in?

AR51 is in Phase 2 clinical development. Two Phase 2 trials have been completed, and no trials are currently active. AR51 is an investigational monoclonal antibody and is not an approved product. Both completed studies were randomized, double-blind, and controlled.

What clinical trials is AR51 in?

AR51 has been evaluated in two completed Phase 2 trials. NCT00551915 studied safety and tolerability in healthy infants at 2, 4, 6, and 12 to 14 months of age, enrolling 756 participants. NCT00551629 tested safety and effectiveness in infants, enrolling 708 participants. Both trials enrolled participants from 6 weeks of age.

Is AR51 the same as AR51 (12, 10)?

Yes, AR51 (12, 10) is another name used for AR51, the investigational monoclonal antibody developed by Merck & Company, Inc. (MRK). Searches for either name refer to the same Phase 2 asset being studied for bacterial infections and virus diseases in healthy infants.