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Immune System DiseasesPhase 2NCT07220811

Phase 2b Study of RPT904 as Monotherapy in Participants With IgE-Mediated Food Allergy

A Phase 2 study testing RPT904 in people with Immune System Diseases and Ig-E Mediated Food Allergy, run by RAPT Therapeutics, Inc., a member of the GSK plc group of companies at 37 sites in 3 countries.

Active, not recruiting

Under way, not looking for participants. Everyone needed has enrolled. The study is still running.

Official record
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Trial summary

Phase 2b Study of RPT904 as Monotherapy in Participants With IgE-Mediated Food Allergy: This is a Phase 2b randomized, double-blind, placebo-controlled clinical trial evaluating RPT904, a next-generation anti-IgE monoclonal antibody, in people with food allergy. Read more about this study

Who is it for?
Ages 12 to 55 years
What is being tested?
RPT904
Type of treatment
Injection or infusion
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
110 participants
Where
37 sitesin 3 countries
Study dates
15 Dec 2025to 21 Dec 2027
Phase
Phase 2
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 12 to 55 years
  • All sexes
  • No healthy volunteers
  • Child, Adult

Who may be able to join

  • Participant and/or parent/legal guardian must be able to understand and provide informed consent and/or assent, as applicable.
  • Male or female, 12 to less than 56 years of age at screening.
  • Allergic to at least 1 of the following foods: peanut, milk, egg, cashew, or walnut, as confirmed by the following criteria:
  • a. For participants aged 12 to <18 years:
  • i. Allergic to peanut: participant must meet all criteria below:
  • 1. Positive SPT (≥4 mm wheal greater than saline control) to peanut.
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  • 2. Positive peanut IgE (≥6 kUA/L) at screening or within 3 months of screening.
  • 3. Positive blinded oral food challenge (OFC) to peanut during the screening DBPCFC, defined as experiencing dose-limiting symptoms at a single dose of ≤100 mg (ie, cumulative dose of ≤144 mg) of peanut protein.
  • ii. Allergic to milk or egg: unable to tolerate both cooked and uncooked forms:
  • 1. Positive SPT (≥4 mm wheal greater than saline control) to the specific food.
  • 2. Positive food-specific IgE (≥6 kUA/L) at screening or within 3 months of screening.
  • 3. Positive blinded OFC to the specific food during the screening DBPCFC, defined as experiencing dose-limiting symptoms at a single dose of ≤300 mg (ie, cumulative dose of ≤444 mg) of food protein.
  • iii. Allergic to cashew: participant must meet all criteria below:
  • 1. Positive SPT (≥4 mm wheal greater than saline control) to cashew. OR
  • 2. Positive cashew IgE (≥6 kUA/L) at screening or within 3 months of screening. AND
  • 3. Positive blinded OFC to cashew during the screening DBPCFC, defined as experiencing dose-limiting symptoms at a single dose of ≤100 mg (ie, cumulative dose of ≤144 mg) of cashew protein.
  • iv. Allergic to walnut: participant must meet all criteria below:
  • 1. Positive SPT (≥4 mm wheal greater than saline control) to walnut. OR
  • 2. Positive walnut IgE (≥6 kUA/L) at screening or within 3 months of screening AND
  • 3. Positive blinded OFC to walnut during the screening DBPCFC, defined as experiencing dose-limiting symptoms at a single dose of ≤300 mg (ie, cumulative dose of ≤444 mg) of walnut protein.
  • b. For participants aged 18 to <56 years:
  • i. Allergic to peanut or cashew: participant must meet all of the following criteria:
  • 1. Positive SPT (≥3 mm wheal greater than saline control) to peanut or cashew.
  • 2. Positive peanut or cashew IgE (≥0.35 kUA/L) at screening or within 3 months of screening.
  • 3. Positive blinded OFC to peanut or cashew during the screening DBPCFC, defined as experiencing dose-limiting symptoms at a single dose of ≤100 mg (ie, cumulative dose of ≤144 mg) of peanut or cashew protein.
  • ii. Allergic to milk or egg: participant must meet all of the following criteria:
  • 1. Positive SPT (≥3 mm wheal greater than saline control) to the specific food.
  • 2. Positive food-specific IgE (≥0.35 kUA/L) at screening or within 3 months of screening.
  • 3. Positive blinded OFC to the specific food during the screening DBPCFC, defined as experiencing dose-limiting symptoms at a single dose of ≤300 mg (ie, cumulative dose of ≤444 mg) of food protein.
  • iii. Allergic to walnut: participant must meet all of the following criteria:
  • 1. Positive SPT (≥3 mm wheal greater than saline control) to walnut.
  • 2. Positive walnut IgE (≥0.35 kUA/L) at screening or within 3 months of screening.
  • 3. Positive blinded OFC to walnut during the screening DBPCFC, defined as experiencing dose-limiting symptoms at a single dose of ≤300 mg (ie cumulative dose of ≤444 mg) of walnut protein.
  • With body weight (as measured at screening) and total serum IgE level (as measured within 3 months of screening) suitable for RPT904 dosing (per RPT904 dosing table).
  • Female Participants:
  • 1. Must not be pregnant or breastfeeding.
  • 2. Women of non-childbearing potential (e.g., surgically sterile or postmenopausal) are eligible.
  • 3. Women of childbearing potential must have a negative pregnancy test before starting study treatment, agree to use a protocol-defined method of contraception during the study and for at least 16 months after the last dose, and must not donate eggs or undergo egg retrieval during this period.
  • Male Participants:
  • 1. Must agree to either remain abstinent from heterosexual intercourse (if that is their usual lifestyle) or use protocol-defined contraception during the study and for 16 months after the last dose.
  • 2. Must not donate semen or participate in sperm banking during this time, and if they have a female partner of childbearing potential, she should also use effective contraception.

Who cannot join

  • Clinically significant lab abnormalities at screening.
  • Sensitivity or suspected/known allergy to any component of the active or placebo OFC material (excluding the test allergens peanut, milk, egg, walnut, and cashew being tested), or drugs related to RPT904 (eg, monoclonal antibodies, polyclonal gamma globulin).
  • Uncontrolled or severe asthma/wheezing at screening.
  • Current use of oral, IM, or IV corticosteroids, tricyclic antidepressants, or β-blockers (oral or topical).
  • Past or current immunotherapy to any study foods within 6 months of screening.
  • Treatment with immunomodulatory therapy within 6 months of screening.
  • Currently in the "build-up phase" of inhalant allergen immunotherapy (i.e., not yet on maintenance). Note: individuals on stable maintenance dosing may be eligible.
  • Past or current medical problems (eg, severe latex allergy), chronic diseases (other than asthma/wheezing, atopic dermatitis, or rhinitis) requiring therapy (eg, heart disease, diabetes), abnormal physical findings or lab results not listed above that, in the Principal Investigator's opinion, may increase study related risks, hinder protocol compliance, or impact data quality or interpretation .

Trial locations and contacts

37 sites in 3 countries.

37 sites in 3 countries

United States22 sites
  • GSK Investigational Site

    Ann Arbor, Michigan, 48105

  • GSK Investigational Site

    Atlanta, Georgia, 30329

  • GSK Investigational Site

    Aurora, Colorado, 80045

  • GSK Investigational Site

    Austin, Texas, 78723

  • GSK Investigational Site

    Boston, Massachusetts, 02114

  • GSK Investigational Site

    Boston, Massachusetts, 02115

  • GSK Investigational Site

    Chapel Hill, North Carolina, 27599

  • GSK Investigational Site

    Cincinnati, Ohio, 45229

  • GSK Investigational Site

    Colorado Springs, Colorado, 80907-6231

  • GSK Investigational Site

    Denver, Colorado, 80206

  • GSK Investigational Site

    Great Neck, New York, 11021

  • GSK Investigational Site

    Houston, Texas, 77030

  • GSK Investigational Site

    Little Rock, Arkansas, 72202

  • GSK Investigational Site

    Minneapolis, Minnesota, 55402-2508

  • GSK Investigational Site

    Nashville, Tennessee, 37212

  • GSK Investigational Site

    New York, New York, 10029

  • GSK Investigational Site

    Palo Alto, California, 94304

  • GSK Investigational Site

    Philadelphia, Pennsylvania, 19104

  • GSK Investigational Site

    Phoenix, Arizona, 85016

  • GSK Investigational Site

    Pittsburgh, Pennsylvania, 15224

  • GSK Investigational Site

    Tampa, Florida, 33613

  • GSK Investigational Site

    Washington D.C., District of Columbia, 20010

Other trials in United States

Australia9 sites
  • GSK Investigational Site

    Clayton, Victoria, 3168

  • GSK Investigational Site

    Darlinghurst, New South Wales, 2010

  • GSK Investigational Site

    Murdoch, Western Australia, 6150

  • GSK Investigational Site

    Nedlands, Western Australia, 6009

  • GSK Investigational Site

    North Adelaide, South Australia, 5006

  • GSK Investigational Site

    Parkville, Victoria, 3052

  • GSK Investigational Site

    Parkville Melbourne, Victoria, 3050

  • GSK Investigational Site

    South Brisbane, Queensland, 4101

  • GSK Investigational Site

    Westmead, New South Wales, 2145

Other trials in Australia

Canada6 sites
  • GSK Investigational Site

    Burlington, Ontario, L7L 6W6

  • GSK Investigational Site

    Montreal, Quebec, H3T 1C5

  • GSK Investigational Site

    Montreal, Quebec, H4A 0B1

  • GSK Investigational Site

    Ottawa, Ontario, K1H 1E4

  • GSK Investigational Site

    Toronto, Ontario, MSG 1H3

  • GSK Investigational Site

    Vancouver, British Columbia, V6H 3V4

Other trials in Canada

About this study

Official title: Phase 2b Randomized, Double-Blind, Placebo-Controlled Study of RPT904 as Monotherapy in Participants With IgE-Mediated Food Allergy

Phase 2b Study of RPT904 as Monotherapy in Participants With IgE-Mediated Food Allergy: This is a Phase 2b randomized, double-blind, placebo-controlled clinical trial evaluating RPT904, a next-generation anti-IgE monoclonal antibody, in people with food allergy. RPT904 is a long-acting antibody that may allow for dosing every 8 to 12 weeks. Approximately 100 participants between the ages of 12 and 55 with documented allergy to at least one of the following foods: peanut, milk, egg, cashew, or walnut will be enrolled. In Part 1 (24 weeks), participants will be randomly assigned to receive RPT904 every 8 or 12 weeks (plus a loading dose at Week 2), or placebo. In Part 2 (24 weeks), participants who received RPT904 will continue on their assigned dosing schedule, and those who previously received placebo will be re-randomized to receive RPT904 either every 8 or 12 weeks (plus a loading dose at Week 26). All participants will attend study visits approximately every 2-6 weeks throughout both Part 1 and Part 2 to maintain blinding, regardless of treatment group or dosing frequency. The study is being conducted at multiple sites. The primary goal is to assess whether RPT904 helps participants tolerate higher amounts of a food allergen without dose-limiting allergic symptoms during a food challenge. The study will also monitor the safety and side effects of RPT904 over time. Each participant is expected to be in the study for about 68 to 74 weeks, including screening, treatment, and follow-up.

Read the detailed description

Phase 2b Randomized, Double-Blind, Placebo-Controlled Study of RPT904 as Monotherapy in Participants With IgE-Mediated Food Allergy

Being tested
RPT904, Placebo
Keywords
Ig-E Mediated food allergy, peanut allergy, milk allergy, egg allergy, cashew allergy, walnut allergy, RPT904, placebo, double-blind placebo-controlled food challenge (DBPCFC), ozureprubart, JYB1904
Medical subject headings
Immune System Diseases, Peanut Hypersensitivity, Milk Hypersensitivity, Egg Hypersensitivity

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • RPT904Drug

    Also called ozureprubart, JYB1904

    Subcutaneous injection once every 8 weeks

  • RPT904Drug

    Also called ozureprubart, JYB1904

    Subcutaneous injection once every 12 weeks

  • PlaceboOther

    Subcutaneous injection at the intervening dosing visits

  • RPT904Drug

    Also called ozureprubart, JYB1904

    Subcutaneous injection once every 8 weeks (Part 2)

  • RPT904Drug

    Also called ozureprubart, JYB1904

    Subcutaneous injection once every 12 weeks (Part 2)

  • PlaceboOther

    Subcutaneous injection on schedules matching both the Q8W and Q12W arms (Part 1). Subcutaneous injection at the intervening dosing visits (Part 2)

Study groups in NCT07220811
Study groupRoleWhat they receive
RPT904 (Q8W)ExperimentalRPT904 every 8 weeks. The dose levels of RPT904 (150 mg, 300 mg, and 600 mg) within the Q8W cohort will be assigned based on participant weight and baseline total IgE level. RPT904 subcutaneous injection every 8 weeks with a loading dose at Week 2 (Part 1: 24 weeks; Part 2: 24 weeks); matching placebo at intervening visits to maintain blinding.
Receives: Drug: RPT904; Other: Placebo
RPT904 (Q12W)ExperimentalRPT904 every 12 weeks. The dose levels of RPT904 (150 mg, 300 mg, and 600 mg) will be assigned based on participant weight and baseline total IgE level. RPT904 subcutaneous injection every 12 weeks with a loading dose at Week 2 (Part 1: 24 weeks; Part 2: 24 weeks); matching placebo at intervening visits to maintain blinding.
Receives: Drug: RPT904; Other: Placebo
PlaceboPlacebo comparatorPlacebo subcutaneous injection on schedules matching both the Q8W and Q12W arms in Part 1 (24 weeks); RPT904 every 8 or 12 weeks with a loading dose at Week 26 on schedules matching both the Q8W and Q12W arms Part 2 (24 weeks), with matching placebo at intervening visits to maintain blinding.
Receives: Drug: RPT904; Other: Placebo

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. To compare the ability to consume a food without dose-limiting symptoms during a DBPCFC at the end of Part 1 after treatment with either RPT904 or placebo

    Proportion of participants who consumed a single dose of ≥600 mg (ie, a cumulative dose of ≥1044 mg) of peanut or cashew protein, or a single dose of ≥1000 mg (ie, a cumulative dose of ≥2044 mg) of milk, egg, or walnut protein without dose-limiting symptoms at Part 1 DBPCFC

    Measured: Approximately 24 weeks

Secondary outcomes (1)
  1. To evaluate safety during treatment with either RPT904 or placebo

    Frequency of treatment-emergent adverse events (TEAEs) related to study therapy regimen

    Measured: Approximately 48 weeks

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted24 Oct 2025
  2. Study start15 Dec 2025
  3. Primary completion16 Mar 2027 (estimated)
  4. Study completion21 Dec 2027 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
Triple blind
Who is masked
Participant, Care provider, Investigator
Enrolment
110 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07220811
Sponsor's protocol ID
309960
Other IDs
RPT904-01, RPT904-01
Status last verified
Oct 2026
First submitted
22 Oct 2025
Last updated
6 Nov 2026
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing RPT904 in people with Immune System Diseases and Ig-E Mediated Food Allergy, run by RAPT Therapeutics, Inc., a member of the GSK plc group of companies at 37 sites in 3 countries.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 41 inclusion and 8 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: under way, not looking for participants, as of the sponsor's last update on 6 Nov 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 37 sites in United States, Australia, Canada. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

To compare the ability to consume a food without dose-limiting symptoms during a DBPCFC at the end of Part 1 after treatment with either RPT904 or placebo (time frame: Approximately 24 weeks). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 6 Nov 2026.

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