Intratonsillar Immunotherapy for Allergic Rhinitis

This is a prospective, open-label, positive parallel controlled, blinded endpoint clinical study designed to compare the safety and efficacy of "Intratonsillar Immunotherapy of Standardized Dust Mite Allergen Extracts (Novo Helisen-Depot, Allergopharma, Merck, Germany)" with Subcutaneous Immunotherapy in patients with "Dust Mite Allergic Rhinitis."

Participants will be evaluated for safety and efficacy throughout the entire three-year period.

Background:

Allergic Rhinitis (AR) presents both nasal and non-nasal symptoms. The global incidence of AR is rising, causing a significant burden. Seasonal allergic rhinitis (SAR) and perennial allergic rhinitis (PAR) are the two related clinical divisions of AR. Allergen immunotherapy (AIT) is a treatment involving the injection of specific allergens into the body. Studies have evaluated the effectiveness and safety of subcutaneous (SCIT), sublingual (SLIT), and intra-lymphatic immunotherapy (ILIT). The mechanisms underlying AIT involve both innate and acquired immunity. AIT modulates the activity of various immune cells, including dendritic cells, innate lymphoid cells (ILCs), and regulatory T cells (Tregs).

Intra-lymphatic inoculation (ILIT) has been studied in animals for its ability to improve T cell response to antigens. Studies have found that direct injection of antigens into lymph nodes can lead to improved T cell response and more efficient delivery of the antigen to subcutaneous lymph nodes. ILIT has been effective in treating atopic dermatitis, producing targeted IgG antibodies, enhancing lymphocyte responses, and treating viral and tumor challenges. It has also been effective in treating allergies and reducing symptoms of allergic rhinitis in mice. Studies have found ILIT to be effective in treating atopic dermatitis in dogs caused by common allergens and insect bite hypersensitivity in horses caused by biting midges. In general, animal studies support the use of ILIT as a safe and effective means to induce IgG and T cell responses with fewer treatments and lower doses compared to subcutaneous injection across a range of species.

Objectives:

The primary objective is to explore the efficacy, clinical value, and possible mechanism of action of Intratonsillar Immunotherapy (ITIT) by recording and analyzing the questionnaire scores after ITIT versus SCIT, while comparing the trend of bio-indicator changes in these two treatments.

Primary Endpoint:

Combined Symptom and Medication Score (CSMS): CSMS serves as the primary efficacy endpoint, tracking changes in participant symptoms and assessing the sustainability and stability of treatment effects. It comprises:

Allergen-induced symptom score: Scored from 0 (no symptoms) to 3 (most severe symptoms) for nasal congestion, rhinorrhea, nasal itching, sneezing, eye itching, and tearing, with the average yielding the symptom score (SS).

Emergency medication use related to allergy symptoms: Assigned points based on antihistamine (1 point/day), nasal corticosteroid (2 points/day), and oral corticosteroid (3 points/day) usage, with the highest value determining the medication score (MS).

CSMS (0-6) = SS (0-3) + MS (0-3). Recorded at baseline and 1, 2, 3, 6, 12, 24, and 36 months post-dust mite extract treatment.

Adverse Reactions: Participants were observed for 30 minutes post-injection and encouraged to report any adverse events during follow-up. Adverse reactions were classified as local (LR) or systemic (SR) according to the World Allergy Organization Subcutaneous Immunotherapy Response Classification System. Detailed records included occurrence time, number of injections, clinical manifestations, and management measures.

Study Population:

A total of 120 screened participants will be required to enroll 60 subjects in each group, with an age range of 5-65 years.

Sites/Facilities Enrolling Participants:

Renmin Hospital of Wuhan University will recruit participants.

Description of Study Intervention:

In this study, participants who meet the enrollment criteria will be randomly assigned to two groups. The random assignment will be performed by an independent investigator using a computer-generated sequence of random numbers. The assignment process will be conducted before participants are enrolled to ensure fairness and randomness in the grouping. Each group will be assigned an equal number of participants to ensure the objectivity and comparability of the studies.

Due to the obvious differences between the treatment methods of the experimental group and the control group, it is difficult to blind the subjects, researchers, and evaluators. Therefore, a non-blind experimental design is adopted. To minimize bias, blind data review will be employed.

Eligibility Criteria:
Inclusion Criteria:

* Voluntarily sign informed consent.
* Commitment to follow the research procedures and cooperate with the implementation of the entire research process.
* Diagnosis in accordance with ARIA guidelines, based on:

  ① Symptoms: Two or more symptoms such as paroxysmal sneezing, watery nose, nasal itching, and nasal congestion, with symptoms lasting or accumulating for more than 1 hour per day. May be accompanied by eye symptoms such as tearing, eye itching, and eye redness.

  ② Signs: Common nasal mucosa pale, edema, nasal watery secretions.
  * Allergen test: Positive for skin prick test (SPT) and/or serum-specific IgE for at least one allergen, or positive for nasal provocation test.
* Have a history of allergic rhinitis caused by atopic allergens and one of the following:

  ① No significant relief after drug treatment.

  ② Do not want to continue taking medication for a long time.

  ③ Long-term drug treatment can produce adverse side effects.
  * Allergens cannot be effectively avoided in daily life.
* Women of childbearing age must ensure that they do not become pregnant during the treatment cycle.
* Must be between 5 and 65 years old.

Exclusion Criteria:

* Allergic to the excipient (aluminum hydroxide) of Allergopharma or the rescue medication epinephrine.
* Respiratory disease other than stable asthma.
* Pulmonary insufficiency (NYHA grade II and above or FEV1 \< 80%) or irreversible changes in the responding organs such as emphysema and bronchiectasis.
* Severe acute or chronic diseases (including malignant diseases), inflammation, and fever.
* Multiple sclerosis.
* Immune system diseases (autoimmune diseases, immune diseases caused by antigen and antibody complexes, immune deficiencies, etc.).
* Active tuberculosis.
* Severe mental disorder.
* Obvious cardiac insufficiency.
* A history of severe recurrent acute sinusitis (defined as two episodes per year within the past 2 years, each requiring antibiotic treatment).
* A history of chronic sinusitis, including at least two of the following symptoms (at least one of which should be nasal congestion or runny nose):

  ① Nasal congestion, runny nose, facial pressure, or pain.

  ② Having a diminished or lost sense of smell.

  ③ Endoscopic or CT examination showed signs of sinusitis.
* Severe liver and renal impairment, including but not limited to abnormal liver function (such as ALT, AST elevation more than 2 times the normal range), abnormal kidney function (such as creatinine clearance less than 60 mL/min), etc.
* Smokers averaging more than 5 cigarettes per day in the 3 months prior to the trial or unable to give up smoking during the entire hospital stay.
* Regular drinkers in the 3 months prior to the trial, i.e., more than 2 units of alcohol per day on average (1 unit = 360ml beer or 45ml spirits with 40% alcohol or 150ml wine).
* Received immunotherapy within the last 3 years (subcutaneous injection or sublingual allergen-specific immunotherapy, etc.).
* Patients who used experimental drugs or participated in other clinical studies within 30 days prior to treatment.
* Patients treated with IgE monoclonal antibodies within the last 4 months.
* Patients who are taking beta blockers.
* Patients who do not have sufficient knowledge about the trial.
* Not between the ages of 5 and 65.
* Patients who are pregnant or nursing during the study period, or who plan to become pregnant.
* Patients who are unable to have tonsil injections due to chronic tonsillitis, small tonsils, prior tonsillectomy, etc.