A Study of IL4Rα Monoclonal Antibody in Patients With Seasonal Allergic Rhinitis(SAR).

A Randomized, Double-Blind, Placebo-Controlled, Multicenter Phase II Clinical Trial to Evaluate the Efficacy and Safety of GR1802 Injection in Combination With Background Therapy in Patients With SAR.

Allergic rhinitis (AR) is a non-infectious chronic inflammatory disease of the nasal mucosa mainly mediated by immunoglobulin E after exposure to allergens in atopic individuals. The typical symptoms of AR are paroxysmal sneezing, watery rhinorrhea, itching, and nasal congestion, which may be accompanied by ocular symptoms, including eye itching, tearing, redness, and burning sensation, which are more common in patients with hay fever allergies. Bronchial asthma is associated with bronchial asthma in 40% of patients with AR, suggesting a comorbid feature of allergic disease.

Main Inclusion Criteria:

1. Voluntarily sign the informed consent form.
2. Seasonal allergic rhinitis has been prevalent for at least 2 years.
3. Poor control of seasonal allergic rhinitis with nasal glucocorticoids or other therapeutic agents during the same pollen season in the past.
4. Positive SPT or serum-specific IgE test results.
5. Symptom severity scores for the season met the enrollment criteria.

Main Exclusion Criteria:

1. Other nasal comorbidities or co-morbidities/states that may be present at the time of screening that affect efficacy determination.
2. Subjects whose allergen exposures in their home or work environments may be expected to change significantly during the trial period.
3. Subjects with poorly controlled recent asthma conditions.
4. Presence of current or past history of infection of special concern, e.g., active tuberculosis, helminthic infections, severe herpes virus infections, etc.
5. Previous use of anti-interleukin 4 receptor alpha subunit (IL4Rα) monoclonal antibody.
6. Have a serious underlying medical condition that, in the opinion of the investigator, may pose a risk to subject safety by participation in a clinical trial.