Safety and Efficacy of Low-dose IL-2 in Birch Pollen Allergy (Rhinil-2)

Several studies have reported a deficit and/or a defect in regulatory T cells in allergic subjects, which can be correlated with the allergic responses, especially for respiratory allergies. Low-dose IL-2 (ld-IL2) specifically targets and activates regulatory T cells (Tregs), which are cells that regulate immune responses. Thus by stimulating Tregs, ld-IL2 would control allergic responses.

This study is designed to evaluate the efficacy of ILT-101 (ld-IL-2), compared to placebo, on the nasal response assessed by Total Nasal Symptom Score (TNSS) during a controlled birch allergen exposure.

Study Overview

• Status: Completed
• Conditions: Allergic Rhinoconjunctivitis to Birch Pollen; With a Positive Skin Prick Test to Birch Pollen
• Intervention / Treatment: Drug: ILT-101 ld-(IL2)

Detailed Description

Primary objective To evaluate the efficacy of ILT-101 (ld-IL-2), compared to placebo, on nasal response on day 40

Secondary objectives To evaluate the efficacy of ILT-101 on rhino-conjunctivitis symptoms, on inflammatory mediators, allergic specific immune responses and safety.

Experimental design This is a monocentric, randomized, placebo controlled, double-blind trial in parallel-groups, evaluating a treatment by ILT-101/placebo, 1 MIU daily for 5 days and 1 MIU every week, until day 36.

Population involved Male or female, aged between 18 and 55 years, with allergic rhinitis to birch pollen.

Number of subjects: 24

Duration of patient participation: 3 months (treatment period: 36 days months, follow-up period: 34 days)

• Study Type: Interventional
• Enrollment (Actual): 24
• Phase: Phase 2

Contacts and Locations

Study Locations

• France
  • Environmental Exposure Chamber, Alyatec, 1 Place de L'hôpital
    • Strasbourg, Environmental Exposure Chamber, Alyatec, 1 Place de L'hôpital, France, 67000
      • Centre d'essais cliniques, ALYATEC
  • Groupe Hospitalier Pitié-Salpêtrière 47 -83 BD de L'hopital
    • Paris, Groupe Hospitalier Pitié-Salpêtrière 47 -83 BD de L'hopital, France, 75013
      • CIC Biothérapies - Service de Biothérapies

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 14 years to 51 years (Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion criteria

• male or female aged between18-55 years
• Positive clinical history of seasonal allergic rhinitis to birch pollen for at least 2 consecutive pollinic seasons before inclusion and requiring medication intake with or without GINA 1 associated asthma, with documentation of sensitivity within 12 months before enrollment by : *Positive skin prick test (SPT) and validated in vitro tests for specific Immunoglobulin E (IgE); *Positive Skin prick test (SPT): wheal for birch pollen ≥ 5 mm in diameter for histamine wheal ≥ 3 mm (positive control) and NaCl reaction < 2 mm (negative control) *Positive specific IgE to birch pollen >0.75 kUI/L;
• Negative beta-HcG pregnancy test at screening visit for women of childbearing age;
• Normal electrocardiogram without clinically significant abnormalities;
• Ability to stay in the EEC for up to 4 hours, without any conditions or factors which could make this not possible
• Positive nasal response (TNSS≥5) at baseline exposure
• Free, informed and written consent signed by the patient and the investigator, before any specific examination required by the study;
• Affiliation to a social security scheme (beneficiary or assignee)
• Negative SARS-CoV-2 test less than 72 hours prior to screening visit

Exclusion Criteria:

• Asthma: GINA 2 to 5
• Eosinophilia > 0.6x109/mL;
• Any history of anaphylactic reactions;
• Specific immunotherapy treatment at the moment, including Omalizumab;
• Specific immunotherapy for birch-pollens within 3 previous years;
• Use of systemic corticosteroid or others immunosuppressive treatment within previous 6 months;
• Moderate to severe allergic rhinoconjunctivitis with or without asthma due to grass pollen, if the study is performed during grass pollen season (according to ARIA)
• Significant rhinitis, or sinusitis, due to daily contact with other allergen causing symptoms that are expected to coincide with exposures, as assessed by the investigator

• Contraindications known to treatment with IL-2:

  • Hypersensitivity to the active substance or to any of the excipients;
  • Immunosuppressed patient;
  • Psychotropic, hepatotoxic, nephrotoxic, myelotoxic or cardiotoxic drugs;
  • Other chronic diseases not clinically controlled;
  • Signs of active infection requiring treatment;
  • Previous history of organ transplantation.
  • Heart failure (≥ grade II, class. NYHA), kidney failure (Cockroft <60 ml/min/1.73m2), liver failure (transaminase> 3N), pulmonary insufficiency (any grade);
• Leukocytes <3000 / mm3 lymphocytes <800 / mm3, platelets <80 000 / mm3, Hemoglobin < 10.0 g/dL or 6.2 mmol/L, red cell blood < 3.5 T/L;
• Positivity of at least one of the thyroid-specific antibodies (anti-TPO, anti-TG, or anti-TRAKS) associated with an abnormal thyroid workup (TSH, T3, or T4) at inclusion;
• Chronic uncontrolled arterial hypertension (Systolic BP > 140 mmHg and/or Diastolic BP > 90 mmHg);
• Poor venous capital will forbid blood samples;
• Vaccination with attenuated live vaccine in the month before the inclusion or planned during the study;
• Vaccination against COVID-19 during the study period or if the 2nd dose of vaccine is planned during the 15 days preceding Visit 3
• Surgery in the previous three months or anticipated under study;
• Participation in other interventional research with study drug in the previous month and during the study;
• Psychiatric illness or any other concomitant chronic illness or addiction that could interfere with the ability to meet the requirements of the protocol or provide informed consent;
• Presence or history of unhealed cancer for more than five years, presence or history of healed cancer for less than five years, except carcinoma in situ of the cervix or basal cell carcinoma;
• Pregnant or lactating women;
• Men and women of childbearing age without effective contraception during the treatment period;

Study Plan

How is the study designed?

Design Details

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

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: ILT-101 (ld-IL2); Subcutaneous injections of ILT-101	Drug: ILT-101 ld-(IL2); Subcutaneous injections of ILT-101 or Placebo starting with once-daily administration for 5 consecutive days followed by once every two weeks administration during five months; Other Names: Placebo
Placebo Comparator: placebo; Subcutaneous injections of placebo	Drug: ILT-101 ld-(IL2); Subcutaneous injections of ILT-101 or Placebo starting with once-daily administration for 5 consecutive days followed by once every two weeks administration during five months; Other Names: Placebo

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change in nasal congestion expressed as area under the curve (AUC), during birch allergen exposure in ALYATEC's Environmental Exposure Chamber (EEC)	Change in nasal congestion expressed as area under the curve (AUC), during birch allergen exposure in ALYATEC's Environmental Exposure Chamber (EEC)	on day 40

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change in nasal congestion expressed as area under the curve (AUC), assessed during 4 hours of exposure	TNSS, expressed as area under the curve (AUC), assessed during 4 hours of exposure: TOTAL NASAL SYMPTOM SCORE Definition of response choices (drop down menu for each of the 4 questions below) 0 = None 1 = Mild (symptom clearly present but easily tolerated) 2 = Moderate (annoying but tolerable symptom) 3 = Severe (difficult to tolerate symptom, disrupts activities)	at Day 8
Change in nasal response intensity	determined by Visual Analogue Scale (VAS) ranged from 0 to 10 cm where higher values correspond to more intense symptoms	at Day 8
Changes in Tregs expressed in percentag (%)	Changes in Tregs in percentag compared to baseline	at day 8
Changes in Tregs expressed in percentag (%)	Changes in Tregs in percentag compared to baseline	at day 40
Changes in Tregs expressed in percentag (%)	Changes in Tregs in percentag compared to baseline	at day 70
Changes in absolute count in Tregs	Changes in absolute count in Tregs compared to baseline	at day 8
Changes in absolute count in Tregs	Changes in absolute count in Tregs compared to baseline	at day 40
Changes in absolute count in Tregs	Changes in absolute count in Tregs compared to baseline	at day 70
Changes in eosinophils expressed in percentag (%)	Changes in eosinophils in percentag compared to baseline	at day 8
Changes in eosinophils expressed in percentag (%)	Changes in eosinophils in percentag compared to baseline	at day 40
Changes in eosinophils expressed in percentag (%)	Changes in eosinophils in percentag compared to baseline	at day 70
Changes in absolute count in eosinophils	Changes in absolute count in eosinophils compared to baseline	at day 8
Changes in absolute count in eosinophils	Changes in absolute count in eosinophils compared to baseline	at day 40
Changes in absolute count in eosinophils	Changes in absolute count in eosinophils compared to baseline	at day 70
Changes in Inate Lymphoid Cell type 2(ILC2) expressed in percentag (%)	Changes in Inate Lymphoid Cell type 2 in percentag compared to baseline	at day 8
Changes in Inate Lymphoid Cell type 2(ILC2) expressed in percentag (%)	Changes in Inate Lymphoid Cell type 2 in percentag compared to baseline	at day 40
Changes in Inate Lymphoid Cell type 2(ILC2) expressed in percentag (%)	Changes in Inate Lymphoid Cell type 2 in percentag compared to baseline	at day 70
Changes in absolute count in Inate Lymphoid Cell type 2(ILC2)	Changes (in absolute count in Inate Lymphoid Cell type 2 compared to baseline	at day 8
Changes in absolute count in Inate Lymphoid Cell type 2(ILC2)	Changes (in absolute count in Inate Lymphoid Cell type 2 compared to baseline	at day 40
Changes in absolute count in Inate Lymphoid Cell type 2(ILC2)	Changes (in absolute count in Inate Lymphoid Cell type 2 compared to baseline	at day 70
Changes of antigen-specific T-cell immune responses (cytokine IL-4 )	cytokine IL-4 at day 40	at day 40
Changes of antigen-specific T-cell immune responses (cytokine IL-4 )	cytokine IL-4 at day 70	at day 70
Changes of antigen-specific T-cell immune responses (cytokine IL-5)	cytokine IL-5 at day 40	at day 40
Changes of antigen-specific T-cell immune responses (cytokine IL-5)	cytokine IL-5 at day 70	at day 70
Changes of antigen-specific T-cell immune responses	IL-13 secretion after antigen restimulation at day 40	at day 40
Changes of antigen-specific T-cell immune responses	IL-13 secretion after antigen restimulation at day 70	at day 70
Changes in allergen-specific IgE dosages basophil activation test with pollen allergen	allergen-specific IgE dosages at day 40	at day 40
Incidence of adverse events at day 8	Adverse events throughout the study (according to NCI-CTC AE classification)	up to Day 8
Incidence of adverse events at day 40	Adverse events throughout the study (according to NCI-CTC AE classification)	up to Day 40
Incidence of adverse events at 70	Adverse events throughout the study (according to NCI-CTC AE classification)	up to Day 70

Collaborators and Investigators

• Sponsor: Assistance Publique - Hôpitaux de Paris
• Collaborators: Iltoo Pharma
• Investigators: Study Chair: David Klatzmann, Pr, APHP / CIC BTI / Hopital Pitie Salpétrière, Paris

Study record dates

Study Major Dates

• Study Start (Actual): February 1, 2019
• Primary Completion (Actual): August 16, 2022
• Study Completion (Actual): August 16, 2022

Study Registration Dates

• First Submitted: November 20, 2018
• First Submitted That Met QC Criteria: December 12, 2018
• First Posted (Actual): December 17, 2018

Study Record Updates

• Last Update Posted (Estimated): September 16, 2025
• Last Update Submitted That Met QC Criteria: September 10, 2025
• Last Verified: December 1, 2022

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Respiratory Tract Diseases; Immune System Diseases; Hypersensitivity, Immediate; Otorhinolaryngologic Diseases; Respiratory Hypersensitivity; Hypersensitivity; Nose Diseases; Rhinitis, Allergic; Rhinitis; Rhinitis, Allergic, Seasonal; Substandard Drugs; Pharmaceutical Preparations; Counterfeit Drugs
• Other Study ID Numbers: P160936J

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No