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ARCT-2138

Phase 1

Influenza, Human | Monoclonal antibody | Infectious Disease |Arcturus Therapeutics Holdings Inc.|Last Updated: Oct 3, 2025

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment139

FDA Designations

No designations recorded

Clinical trial landscape

ARCT-2138 · 1 trial · 1 indication

Phase 1 1
NCT06125691Safety and Immunogenicity First-in-human Dose-ranging Study of Self-Amplifying RNA Seasonal Influenza Vaccine in AdultsInfluenza, Human
COMPLETED139 Analytics
PHASE1COMPLETED
Safety and Immunogenicity First-in-human Dose-ranging Study of Self-Amplifying RNA Seasonal Influenza Vaccine in Adults
Influenza, HumanUnlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of participants reporting local Adverse Events
14 Days following study vaccination

Solicited local AEs include injection-site pain, erythema and swelling

Percentage of participants reporting systemic Adverse Events
14 Days following study vaccination

Solicited systemic AEs include fatigue, headache, myalgia, arthralgia, nausea, chills, and fever.

Percentage of participants reporting unsolicited Adverse Events
29 Days following study vaccination

Spontaneously reported adverse events and as elicited by investigational site staff

Percentage of participants reporting laboratory or vital signs abnormalities
29 Days following study vaccination

Abnormal clinically significant values

Percentage of participants reporting serious adverse events, medically attended adverse events adverse events of special interest and adverse events leading early termination
29 Days following study vaccination

Spontaneously reported adverse events and as elicited by investigational site staff

Serum hemagglutination inhibition (HAI) antibody levels against the HA glycoprotein.
29 days following study vaccination

HAI antibody levels expressed as GMT, GMFI, SCRs and HAI titers.

Serum neuraminidase enzyme-linked lectin (ELLA) assay antibody levels against the NA glycoproteins.
29 days following study vaccination

ELLA antibody levels expressed as GMT, GMFI, SCRs and HAI titers.

Secondary Endpoints

Percentage of participants reporting serious adverse events, medically attended adverse events adverse events of special interest and adverse events leading early termination
181 days following study vaccination
Serum hemagglutination inhibition (HAI) antibody levels against the HA glycoprotein.
181 days following study vaccination
Serum neuraminidase enzyme-linked lectin (ELLA) assay antibody levels against the NA glycoproteins.
181 days following study vaccination
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
Cohort 1 of ARCT-2138, younger adultsEXPERIMENTALDose Level 1 of ARCT-2138 administered through intramuscular injection in the deltoid muscle. Interventions: Investigational Vaccine: ARCT-2138
Cohort 2 of ARCT-2138, younger adultsEXPERIMENTALDose Level 2 of ARCT-2138 administered through intramuscular injection in the deltoid muscle. Interventions: Investigational Vaccine: ARCT-2138
Cohort 3 of ARCT-2138, younger adultsEXPERIMENTALDose Level 3 of ARCT-2138 administered through intramuscular injection in the deltoid muscle. Interventions: Investigational Vaccine: ARCT-2138
Cohort 4 of ARCT-2138, younger adultsEXPERIMENTALDose Level 4 of ARCT-2138 administered through intramuscular injection in the deltoid muscle. Interventions: Investigational Vaccine: ARCT-2138
Low Dose, younger and older adultsEXPERIMENTALLow dose level of ARCT-2138 administered through intramuscular injection in the deltoid muscle. Interventions: Investigational Vaccine: ARCT-2138
Medium Dose, younger and older adultsEXPERIMENTALMedium dose level of ARCT-2138 administered through intramuscular injection in the deltoid muscle. Interventions: Investigational Vaccine: ARCT-2138
High Dose, younger and older adultsEXPERIMENTALHigh dose level of ARCT-2138 administered through intramuscular injection in the deltoid muscle. Interventions: Investigational Vaccine: ARCT-2138
Control Dose, younger adultsACTIVE_COMPARATORLicensed Quadrivalent Vaccine administered through intramuscular injection in the deltoid muscle. Interventions: Control Vaccine: Licensed Quadrivalent Vaccine for younger adults
Control Dose, older adultsACTIVE_COMPARATORLicensed Quadrivalent Vaccine administered through intramuscular injection in the deltoid muscle. Interventions: Control Vaccine: Licensed Quadrivalent Vaccine for older adults

Interventions

NameTypeDescription
ARCT-2138BIOLOGICALEach participant will receive one 0.5 mL intramuscular (IM) dose into the deltoid muscle.
Licensed Quadrivalent Vaccine for younger adultsBIOLOGICALEach participant will receive one 0.5 mL intramuscular (IM) dose into the deltoid muscle.
Licensed Quadrivalent Vaccine for older adultsBIOLOGICALEach participant will receive one 0.5 mL intramuscular (IM) dose into the deltoid muscle.
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Eligibility Criteria

Age Range18 Years to 85 Years
SexALL
Healthy VolunteersYes
Study Sites2

Inclusion Criteria: 1. Individuals are male, female, or transgender adults 18 to 49 years of age or 65 to 85 years of age. 2. Healthy participants or participants with pre-existing stable medical conditions. Pre-existing stable medical condition means a subject who: has full capacity of daily activ...

Countries:Australia
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Frequently asked questions about ARCT-2138

What is ARCT-2138 used for?

ARCT-2138 is an investigational vaccine being developed for the prevention of influenza in humans. It is currently in Phase 1 clinical development, meaning it is still being studied and has not been approved for use.

Who makes ARCT-2138?

ARCT-2138 is being developed by Arcturus Therapeutics Holdings Inc., a biopharmaceutical company traded on the NASDAQ under the ticker symbol ARCT.

What phase is ARCT-2138 in?

ARCT-2138 is in Phase 1 clinical development. It is an investigational vaccine and has not been approved by regulatory authorities. A Phase 1 trial has been completed, but the vaccine remains in early-stage development.

What clinical trials is ARCT-2138 in?

ARCT-2138 was studied in a completed Phase 1 clinical trial registered as NCT06125691. This was a first-in-human, dose-ranging study of a self-amplifying RNA seasonal influenza vaccine in adults, conducted in Australia with 139 participants.

Is ARCT-2138 a monoclonal antibody?

No, ARCT-2138 is not a monoclonal antibody. It is a self-amplifying RNA vaccine designed to prevent influenza. The modality listed for this asset is a vaccine, not an antibody therapy.

How does ARCT-2138 work?

ARCT-2138 is a self-amplifying RNA vaccine. It works by delivering genetic instructions that prompt the body's cells to produce an immune response against influenza viruses, potentially providing protection against seasonal flu.