Grass Pollen Immunotherapy Plus Dupilumab for Tolerance Induction (GRADUATE)

Grass Pollen Sublingual Tablet Immunotherapy Plus Dupilumab for Induction of Tolerance in Adults With Moderate to Severe Seasonal Allergic Rhinitis (ITN084AD)

The primary objective of this study is to assess whether the combination of grass allergen sublingual immunotherapy (SLIT) and dupilumab for 2 years is more effective than double placebo in suppressing the nasal allergen challenge (NAC) response to grass pollen at 1 year after completion of study medication.

Study Overview

• Status: Completed
• Conditions: Grass Pollen Allergy; Allergic Rhinoconjunctivitis
• Intervention / Treatment: Biological: Dupixent®; Biological: Grazax®; Drug: Dupixent® Placebo; Drug: Grazax® Placebo

Detailed Description

This is a double-blind (masked) placebo-controlled trial in adults (N=108 subjects will be enrolled) with moderate to severe seasonal allergic rhinitis and allergic sensitization to grass pollen. Eligible participants who demonstrate a positive response defined by a Total Nasal Symptom Score [TNSS] ≥ 5 (Scale 0-12 in response to a Nasal Allergen Challenge [NAC] with grass pollen extract), will be randomized to one of the following 3 groups in a 1:1:1 ratio:

• Grass allergen sublingual immunotherapy (SLIT) + dupilumab (n=36)
• Grass allergen SLIT +dupilumab placebo (n=36)
• Grass allergen SLIT placebo + dupilumab placebo (n=36)

Grazax® is a sublingual grass allergen immunotherapy product approved for clinical use in the United Kingdom and will be used as SLIT in this study. Grazax (and its matching placebo) will be self-administered daily by participants for a duration of two years.

Dupixent®is the brand name for dupilumab and is a monoclonal antibody against the interleukin 4 (IL-4) receptor. Dupilumab (and its matching placebo) will be administered every two weeks by subcutaneous injection through for a duration of two years, administered by study personnel. The treatment phase of two years will be followed by an observation phase of 1 year.

• Study Type: Interventional
• Enrollment (Actual): 199
• Phase: Phase 2

Contacts and Locations

Study Locations

• United Kingdom
  • London, United Kingdom, SW36HP
    • Royal Brompton Hospital

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 14 years to 61 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Participant must be able to understand and provide informed consent
• A clinical history of grass pollen-induced allergic rhinoconjunctivitis for at least 2 years, with peak symptoms in May, June, or July
• A clinical history of moderate to severe rhinoconjunctivitis symptoms for at least 2 years, interfering with usual daily activities or with sleep as defined according to the Allergic Rhinitis and Its Impact on Asthma (ARIA) classification of rhinitis
• A clinical history of inadequately controlled rhinoconjunctivitis symptoms, despite treatment with antihistamines and/or nasal corticosteroids during the grass pollen season, for at least 2 years
• Positive skin prick test response at screening, defined as wheal diameter ≥3 mm to Phleum pratense
• Positive specific immunoglobulin E (IgE) at screening, defined as IgE class 2 (e.g., ≥ 0.7 kilounits per liter [kU/L]) against Phleum pratense

• A woman of childbearing potential (WOCBP), regardless of birth control history, must:

  • have a negative serum pregnancy test at screening,

  • not be breast-feeding or lactating, and ---is required to consistently use one of the following highly effective methods of contraception throughout the study:

    • hormonal (e.g. oral, transdermal, intravaginal, implant, or injection),
    • intrauterine device (IUD) or system (IUS),
    • vasectomized partner,
    • bilateral tubal occlusion, or
    • sexual abstinence.

Exclusion Criteria:

• Inability or unwillingness of the Subject to give written informed consent or to comply with study protocol requirements
• Prebronchodilator forced expiratory volume (FEV1) <70% of predicted value at either Screening Visit or Baseline (Visit 0) Visit
• A clinical history of asthma requiring regular inhaled corticosteroids for >4 weeks per year, outside of the grass pollen season

• A clinical history of moderate to severe allergic rhinitis, as defined according to the Allergic Rhinitis and Its Impact on Asthma (ARIA) classification of rhinitis, caused by either:

  • An allergen to which the Subject is regularly exposed, or
  • Tree pollen during tree pollen season, treated with regular antihistamine or intranasal corticosteroids
• History of emergency visit or hospital admission for asthma in the previous 12 months
• History of chronic obstructive pulmonary disease
• History of recurrent acute sinusitis, defined as 2 episodes per year for the last 2 years, all of which required antibiotic treatment

• History of chronic sinusitis, defined as a sinus symptoms lasting greater than 12 weeks, that includes 2 or more major factors or 1 major factor and 2 minor factors.

  • Major factors are defined as:

    • Facial pain or pressure,
    • Nasal obstruction or blockage,
    • Nasal discharge or purulence or discolored postnasal discharge,
    • Purulence in nasal cavity, or
    • Impaired or loss of smell.

  • Minor factors are defined as:

    • Headache,
    • Fever,
    • Halitosis,
    • Fatigue,
    • Dental pain,
    • Cough, and/or
    • Ear pain, pressure, or fullness.
• History of systemic disease affecting the immune system, such as autoimmune diseases, immune complex disease or immunodeficiency

• At randomization: Current symptoms of, or treatment for:

  • Upper respiratory tract infection,
  • Acute sinusitis,
  • Acute otitis media, or
  • Other relevant infectious process ---Note: 1.) Serous otitis media is not an exclusion criterion and 2.) Participants may be re-evaluated for eligibility after symptoms resolve.
• A past history of any malignant disease in the previous 5 years
• Any tobacco smoking within the last 6 months, or a history of greater than or equal to 10 pack years of cigarette use.
• Any vaping or electronic cigarette use within the last 6 months
• Previous immunotherapy with grass pollen allergen within the previous 5 years
• Previous treatment by dupilumab (Dupixent®)
• Previous Grade 4 anaphylaxis (World Allergy Organization grading criteria), due to any cause
• History of anti-IgE, anti-IL-5, anti-IL-5 receptor, anti-IL-4/IL-13 receptor, or other monoclonal antibody treatment
• Use of tricyclic antidepressants or monoamine oxidase inhibitors
• Ongoing systemic immunosuppressive treatment
• History of intolerance to the study therapy, rescue medications, or their excipients
• For women of childbearing age a positive serum or urine pregnancy test with sensitivity of less than 50 milli-international units per milliliter [mIU/ml] within 72 hours before the scheduled start of study therapy
• The use of any investigational drug within 30 days of the Screening Visit
• The presence of any medical condition that the investigator deems incompatible with participation in the trial
• Past or current medical problems or findings from physical examination or laboratory testing that are not listed above, which, in the opinion of the investigator, may pose additional risks from participation in the study, may interfere with the participant's ability to comply with study requirements or may impact the quality or interpretation of the data obtained from the study
• Eosinophilic esophagitis or a diagnosis of any hypereosinophilic syndrome, and/or
• Administration of live attenuated vaccines within four weeks of dupilumab or dupilumab placebo injections, before the first injection and throughout the treatment period.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Triple

Number of Arms

3

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Grazax® +Dupixent®; Participants randomized to this assignment will receive the following during the initial 2-year period of the trial: Once daily tablet of Grazax® sublingual immunotherapy and; Dupixent® administered every other week (e.g., biweekly) by subcutaneous injection	Biological: Dupixent®; An initial dose of 600 mg (two 300 mg injections), followed by 300 mg administered every other week (biweekly), by subcutaneous injection.; Other Names: dupilumab; monoclonal antibody against the IL-4 receptor; Biological: Grazax®; One Grazax® tablet daily, by sublingual administration. Grazax® is formulated as a freeze-dried oral lyophilisate/orally disintegrating tablet for oromucosal use. The active pharmaceutical ingredient is a standardized allergen extract derived from extraction and purification of grass pollen from timothy grass (Phleum pratense). The biological activity of the allergen is expressed in Standardized Quality Tablet units (SQ-T) units. The Grazax® dosage is one oral lyophilisate (75,000 Standardized Quality Tablet units (SQ-T) or approximately 2800 Bioequivalent allergy units (BAU), a measure of Phleum pratense SQ total biological potency defined by the FDA.; Other Names: grass pollen allergen sublingual immunotherapy (SLIT); timothy grass (Phleum pratense) sublingual immunotherapy (SLIT)
Experimental: Grazax® + Dupixent® Placebo; Participants randomized to this assignment will receive the following during the initial 2-year period of the trial: Once daily tablet of Grazax® sublingual immunotherapy and; Placebo for Dupixent® administered every other week (e.g., biweekly) by subcutaneous injection	Biological: Grazax®; One Grazax® tablet daily, by sublingual administration. Grazax® is formulated as a freeze-dried oral lyophilisate/orally disintegrating tablet for oromucosal use. The active pharmaceutical ingredient is a standardized allergen extract derived from extraction and purification of grass pollen from timothy grass (Phleum pratense). The biological activity of the allergen is expressed in Standardized Quality Tablet units (SQ-T) units. The Grazax® dosage is one oral lyophilisate (75,000 Standardized Quality Tablet units (SQ-T) or approximately 2800 Bioequivalent allergy units (BAU), a measure of Phleum pratense SQ total biological potency defined by the FDA.; Other Names: grass pollen allergen sublingual immunotherapy (SLIT); timothy grass (Phleum pratense) sublingual immunotherapy (SLIT); Drug: Dupixent® Placebo; Two subcutaneous injections of Placebo (for Dupilumab) as a loading dose followed by a single injection administered every other week. Dupixent® placebo is a subcutaneous injection whose composition is identical to the active Dupixent®, with the exception of the active pharmaceutical ingredient.; Other Names: placebo
Placebo Comparator: Grazax® Placebo +Dupixent® Placebo; Participants randomized to this assignment will receive the following during the initial 2-year period of the trial: Once daily tablet of placebo for Grazax® sublingual immunotherapy and; Placebo for Dupixent® administered every other week (e.g., biweekly) by subcutaneous injection	Drug: Dupixent® Placebo; Two subcutaneous injections of Placebo (for Dupilumab) as a loading dose followed by a single injection administered every other week. Dupixent® placebo is a subcutaneous injection whose composition is identical to the active Dupixent®, with the exception of the active pharmaceutical ingredient.; Other Names: placebo; Drug: Grazax® Placebo; One tablet of Placebo (for Grazax®) daily, by sublingual administration. Grazax® placebo is a tablet whose composition is identical to the active Grazax® tablet with the only exception being exclusion of the active pharmaceutical ingredient, Phleum pratense Standardized Quality Tablet (SQ-T) units.; Other Names: placebo

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
TNSS Area Under Curve (AUC) Post Nasal Allergen Challenge (NAC) Over the First Hour After the Challenge (0-1 Hour (hr) at Year 3	NAC (TNSS Area-under-Curve [AUC 0-1hr]), comparing the TNSS AUC 0-1 hr between the referenced treatment arms: a clinical tolerance outcome measure at Year 3, one year after completion of treatment. The Total Nasal Symptom Score (TNSS) is a participant-reported composite symptom assessment of 4 symptoms (rhinorrhea, nasal congestion, nasal itching and sneezing), each scored on a scale from 0 to 3 where 0 = none, 3 = severe. TNSS total score is calculated as the sum of the response for all 4 individual nasal symptom scores and can range from a minimum score of 0 to a maximum score of 12: a higher score indicates more severe symptoms. The primary treatment comparison is between SLIT/Dupilumab and Double-Placebo.	0 to 1 hour of the NAC at Year 3 (One Year After Completion of Treatment)

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
TNSS Area Under Curve (AUC) Post Nasal Allergen Challenge (NAC) Over the First Hour After the Challenge (0-1 Hour (hr) at Years 1 and 2	NAC (TNSS Area-under-Curve [AUC 0-1hr]), comparing the referenced treatment arms at years 1 and 2 while on study treatment for clinical desensitization. The Total Nasal Symptom Score (TNSS) is a participant-reported composite symptom assessment of 4 symptoms (rhinorrhea, nasal congestion, nasal itching and sneezing), each scored on a scale from 0 to 3 where 0 = none, 3 = severe. TNSS total score is calculated as the sum of the response for all 4 individual nasal symptom scores and can range from a minimum score of 0 to a maximum score of 12: a higher score indicates more severe symptoms. The following treatment comparisons are of secondary outcome interest: Comparison between SLIT/Dupilumab and Double-Placebo; Comparison between SLIT/Dupilumab versus SLIT/Dupilumab Placebo Both treatment comparisons are key secondary endpoints at Year 2 and therefore multiplicity adjustments are considered; however, at Year 1 the same comparisons are not adjusted for multiplicity.	0 to 1 hour of the NAC at Years 1 and 2
TNSS Peak (Maximum) Value Post Nasal Allergen Challenge (NAC) Over the First Hour After the Challenge (0-1 Hour (hr) at Years 1, 2, and 3	The NAC Total Nasal Symptom Score (TNSS) is a participant-reported composite symptom assessment of 4 symptoms (rhinorrhea, nasal congestion, nasal itching and sneezing), each scored on a scale from 0 to 3 where 0 = none, 3 = severe. TNSS total score is calculated as the sum of the response for all 4 individual nasal symptom scores and can range from a minimum score of 0 to a maximum score of 12: a higher score indicates more severe symptoms. The following treatment comparison is of secondary outcome interest, where Year 3 is a clinical tolerance outcome measure, and Years 1 and 2 are clinical desensitization outcome measures: • Comparison between SLIT/Dupilumab and Double-Placebo According to the SAP, this treatment comparison at Year 3 is a key secondary endpoint and therefore a multiplicity adjustment is considered; however at Years 1 and 2 the comparisons are not adjusted for multiplicity.	0 to 1 hour of the NAC at Years 1 and Year 2, and at Year 3 (One Year After Completion of Treatment)
Global Evaluation Questionnaire Number 2 at Years 1, 2, and 3	For the Global Evaluation No. 2 questionnaire, participants are asked a single question regarding the change in current rhinitis/hay fever compared to the years prior to initiating study treatment (Much better: +3, Much worse: -3). The following treatment comparison is of secondary outcome interest, where Year 3 is a clinical tolerance outcome measure, and Years 1 and 2 are clinical desensitization outcome measures: • Comparison between SLIT/Dupilumab and Double-Placebo According to the SAP, this treatment comparison at Year 3 is a key secondary endpoint and therefore a multiplicity adjustment is considered; however at Years 1 and 2 the comparisons are not adjusted for multiplicity.	Years 1 and Year 2, and at Year 3 (One Year After Completion of Treatment)
Frequency, Severity, and Relatedness of Treatment-Emergent Adverse Events (AEs) by Treatment Arm	The number and percentage of participants with at least one treatment-emergent AE in the following categories will be summarized by treatment arm: any AE related to any study drug; any severe (Grade 3 or higher) AE Only treatment-emergent AEs will be summarized. All AEs, including local, systemic, and serious AEs will be considered. For grading severity, the protocol-specified grading criteria will be used which depends on the type of AE: Grading Table for Local Reactions to SLIT (Grades 1-4); Grading Table for Local Reactions to Allergen Skin Testing (Grades 1-3); Grading Table for NAC Procedure for Local Reactions (Grades 1-4); WAO Subcutaneous Immunotherapy Systemic Reaction Grading System (Grades 1-5) for any immediate (0-1hr) systemic allergic reaction; National Cancer Institute's (NCI's) Common Toxicity Criteria for Adverse Events (CTCAE) v5.0 (November 27, 2017; Grades 1-5) for all remaining AEs.	Start of study treatment until completion of study participation at year 3, or until 30 days after prematurely withdrawing from the study
Peak Nasal Inspiratory Flow (PNIF) (Delta PNIF Area Under the Curve [AUC] 0-1 hr) at Years 1, 2, and 3	PNIF is defined as the maximum effort speed of inspiration of air in Liters per minute when breathing into the lungs through the nose. Lower scores indicate less ability to breathe air into the lungs due to more severe nasal congestion. The following treatment comparison is of secondary outcome interest, where Year 3 is a clinical tolerance outcome measure, and Years 1 and 2 are clinical desensitization outcome measures: • Comparison between SLIT/Dupilumab and Double-Placebo According to the SAP, this treatment comparison at Year 3 is a key secondary endpoint and therefore a multiplicity adjustment is considered; however, at Years 1 and 2 the comparisons are not adjusted for multiplicity.	0 to 1 hour of the NAC at Years 1 and Year 2, and at Year 3 (One Year After Completion of Treatment)
Size of Early Intradermal Skin Test Response at Years 1, 2, and 3	An intradermal skin test will be performed in duplicate (left and right arm) using Timothy grass pollen, with an early phase read-out after 15 minutes (with a +/- 3 minute window). A 10 BU test concentration will be used. The average of left and right arm wheal sizes will be used for analysis. A higher wheal size indicates a more severe reaction. The following treatment comparison is of secondary outcome interest, where Year 3 is a clinical tolerance outcome measure, and Years 1 and 2 are clinical desensitization outcome measures: • Comparison between SLIT/Dupilumab and Double-Placebo According to the SAP, this treatment comparison at Year 3 is a key secondary endpoint and therefore a multiplicity adjustment is considered; however at Years 1 and 2 the comparisons are not adjusted for multiplicity.	Years 1 and Year 2, and at Year 3 (One Year After Completion of Treatment)
Size of Late Intradermal Skin Test Response at Years 1, 2, and 3	An intradermal skin test will be performed in duplicate (left and right arm) using Timothy grass pollen, with a late phase read-out after 6.5 hours (with a +/- 30 minute window) post initial injection. A 10 BU test concentration will be used. The average of left and right arm induration sizes will be used for analysis. A higher induration indicates a more severe reaction. The following treatment comparison is of secondary outcome interest, where Year 3 is a clinical tolerance outcome measure, and Years 1 and 2 are clinical desensitization outcome measures: • Comparison between SLIT/Dupilumab and Double-Placebo According to the SAP, this treatment comparison at Year 3 is a key secondary endpoint and therefore a multiplicity adjustment is considered; however, at Years 1 and 2 the comparisons are not adjusted for multiplicity.	Years 1 and Year 2, and at Year 3 (One Year After Completion of Treatment)
Size of Skin Prick Test Endpoint Titration Response as Defined by the Provocative Concentration at 5mm (PC5) at Years 1, 2, and 3	A skin prick test endpoint titration response assessment will be performed in left and right arms using increasing concentrations of Timothy grass pollen (0.001 to 10 HEP U/mL). The average of left and right arm wheal sizes will be analyzed. The PC5 is defined as the minimum concentration (on base-10 log scale) for which an average wheal size is ≥5mm, based on linear interpolation. A smaller PC5 indicates a more severe reaction. Geometric means were back-transformed to original HEP U/mL scale from log10 values. The following treatment comparison is of secondary outcome interest, where Year 3 is a clinical tolerance outcome measure, and Years 1 and 2 are clinical desensitization outcome measures: • Comparison between SLIT/Dupilumab and Double-Placebo According to the SAP, this treatment comparison at Year 3 is a key secondary endpoint and therefore a multiplicity adjustment is considered; however, at Years 1 and 2 the comparisons are not adjusted for multiplicity.	Years 1 and Year 2, and at Year 3 (One Year After Completion of Treatment)
Weekly Seasonal Combined Symptom Medication Score (CSMS) at Years 1, 2, and 3 (In Season Estimates)	A participant-reported seasonal symptoms outcome calculated as average of: a) weekly Visual Analogue Scale (VAS) score and b) weekly medication score (WMS), each assessed for the 7 days prior to the assessment. VAS (0=No Symptoms, 10=Worst possible symptoms) and WMS (0 = medications not used this week, 10 = medications on 5 or more days this week). Weekly Seasonal CSMS ranges from 0-10, with 10 being the highest severity. The average score per participant was calculated across the "in-season" weeks per year. The following treatment comparison is of secondary outcome interest, where Year 3 is a clinical tolerance outcome measure, and Years 1 and 2 are clinical desensitization outcome measures: • Comparison between SLIT/Dupilumab and Double-Placebo This treatment comparison at Year 3 is a key secondary endpoint and therefore a multiplicity adjustment is considered; however at Years 1 and 2 the comparisons are not adjusted for multiplicity.	Years 1 and Year 2, and at Year 3 (One Year After Completion of Treatment)
Weekly Seasonal Visual Analogue Scale (VAS) 0-10cm Score at Years 1, 2, and 3 (In Season Estimates)	A participant-reported (self-administered) seasonal symptoms outcome measure on a Likert scale (0 to 10 cm, 0=No Symptoms, 10=Worst possible symptoms), a quality of life measure reflecting the impact of rhinitis ("hay fever") symptoms experienced during the 7 days prior to the assessment. The average score per participant was calculated across the "in-season" weeks per year. The following treatment comparison is of secondary outcome interest, where Year 3 is a clinical tolerance outcome measure, and Years 1 and 2 are clinical desensitization outcome measures: • Comparison between SLIT/Dupilumab and Double-Placebo According to the SAP, no comparisons at any year are adjusted for multiplicity for this outcome.	Years 1 and Year 2, and at Year 3 (One Year After Completion of Treatment)
Weekly Seasonal Medication Score (WMS) at Years 1, 2, and 3 (In Season Estimates)	A participant-reported (self-administered) seasonal symptoms medications score based on the use of antihistamines (oral and/or eyedrop) and intranasal corticosteroids, assessed for the 7 days prior to the assessment. The WMS has a score ranging from 0 to 10 (0 = medications not used this week, 10 = medications on 5 or more days this week). The average score per participant was calculated across the "in-season" weeks per year. The following treatment comparison is of secondary outcome interest, where Year 3 is a clinical tolerance outcome measure, and Years 1 and 2 are clinical desensitization outcome measures: • Comparison between SLIT/Dupilumab and Double-Placebo According to the SAP, no comparisons at any year are adjusted for multiplicity for this outcome.	Years 1 and Year 2, and at Year 3 (One Year After Completion of Treatment)
Weekly Rhinitis Quality of Life Score Using the Juniper Mini-Rhinoconjunctivitis Quality of Life Questionnaire (miniRQLQ) at Years 1, 2, and 3 (In Season Estimates)	The Juniper Mini-Rhinoconjunctivitis Quality of Life Questionnaire (MiniRQLQ) is a participant-reported (self-administered) questionnaire that consists of 14 questions grouped into 5 domains. Each question is scored on a scale of 0 (not troubled with symptoms) to 6 (extremely troubled with symptoms) and describes nose/eye symptoms experienced for the 7 days prior to the assessment. A total score was calculated as average of all questions. The average total score per participant was calculated across the "in-season" weeks per year. The following treatment comparison is of secondary outcome interest, where Year 3 is a clinical tolerance outcome measure, and Years 1 and 2 are clinical desensitization outcome measures: • Comparison between SLIT/Dupilumab and Double-Placebo According to the SAP, this treatment comparison at Year 3 is a key secondary endpoint and therefore a multiplicity adjustment is considered; however at Years 1 and 2 the comparisons are not adjusted for multiplicity.	Years 1 and Year 2, and at Year 3 (One Year After Completion of Treatment)
Modified Rhinitis Symptom Utility Index (MRSUI) Questionnaire Measured In-Season at Years 1, 2, and 3	The Modified Rhinitis Symptom Utility Index (MRSUI) questionnaire consists of 10 questions regarding symptoms experienced during the prior 2 weeks from the nose, eyes, and throat, specifically how frequently the symptoms occurred and how bothersome they were. The total MRSUI score will be calculated as the sum of the numeric responses to all 10 questions. The total MRSUI score ranges from 0-25, with 25 being the worst outcome. The following treatment comparison is of secondary outcome interest, where Year 3 is a clinical tolerance outcome measure, and Years 1 and 2 are clinical desensitization outcome measures: • Comparison between SLIT/Dupilumab and Double-Placebo According to the SAP, this treatment comparison at Year 3 is a key secondary endpoint and therefore a multiplicity adjustment is considered; however at Years 1 and 2 the comparisons are not adjusted for multiplicity.	Years 1 and Year 2, and at Year 3 (One Year After Completion of Treatment)
Global Evaluation Questionnaire Number 1 at Years 1, 2, and 3	Participants are asked to describe their allergic rhinitis ("hay fever"). This administered questionnaire is comprised of 6 questions, focusing on nasal and eye symptoms [0=No symptoms, 3=Severe]. The total Global Evaluation No. 1 score will be calculated as the total sum of the numeric responses to all 6 questions. Higher scores indicate a worse outcome/severity, where the minimum score is 0 and maximum score is 18. The following treatment comparison is of secondary outcome interest, where Year 3 is a clinical tolerance outcome measure, and Years 1 and 2 are clinical desensitization outcome measures: • Comparison between SLIT/Dupilumab and Double-Placebo According to the SAP, this treatment comparison at Year 3 is a key secondary endpoint and therefore a multiplicity adjustment is considered; however, at Years 1 and 2 the comparisons are not adjusted for multiplicity.	Years 1 and Year 2, and at Year 3 (One Year After Completion of Treatment)

Collaborators and Investigators

• Sponsor: National Institute of Allergy and Infectious Diseases (NIAID)
• Collaborators: Regeneron Pharmaceuticals; Rho Federal Systems Division, Inc.; ALK-Abelló A/S; Immune Tolerance Network (ITN); PPD Development, LP
• Investigators: Study Chair: Stephen R. Durham, MD, Allergy and Clinical Immunology Section at NHLI,Imperial College London

Publications and helpful links

Helpful Links

• National Institute of Allergy and Infectious Diseases (NIAID)
• Division of Allergy, Immunology, and Transplantation (DAIT)
• Immune Tolerance Network (ITN)

Study record dates

Study Major Dates

• Study Start (Actual): November 5, 2020
• Primary Completion (Actual): February 20, 2025
• Study Completion (Actual): February 20, 2025

Study Registration Dates

• First Submitted: August 4, 2020
• First Submitted That Met QC Criteria: August 4, 2020
• First Posted (Actual): August 6, 2020

Study Record Updates

• Last Update Posted (Actual): April 27, 2026
• Last Update Submitted That Met QC Criteria: April 23, 2026
• Last Verified: April 1, 2026

More Information

Terms related to this study

• Keywords: immunotherapy; nasal allergen challenge (NAC); total nasal symptom score (TNSS)
• Additional Relevant MeSH Terms: Immune System Diseases; Respiratory Tract Diseases; Respiratory Hypersensitivity; Hypersensitivity, Immediate; Hypersensitivity; Nose Diseases; Otorhinolaryngologic Diseases; Rhinitis; Rhinitis, Allergic; Rhinitis, Allergic, Seasonal; Investigative Techniques; Therapeutics; Biological Therapy; Immunologic Techniques; Immunomodulation; Immunotherapy; Immunosuppression Therapy; Desensitization, Immunologic; dupilumab; Sublingual Immunotherapy; Grazax
• Other Study ID Numbers: DAIT ITN084AD; NIAID CRMS ID#: 38629 (Other Identifier: DAIT NIAID); 2018-003456-20 (EudraCT Number)

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No