This is a parallel, Phase 2, 2-arm, multicenter, randomized, double-blind, placebo-controlled, proof-of-concept study for treatment of CRSwNP.

The purpose of this study is to assess the efficacy, safety, and tolerability of add-on therapy with subcutaneous lunsekimig in adult participants (aged 18 to 70 years, inclusive) with CRSwNP who are inadequately controlled on intranasal corticosteroid treatment. Participants with and without co-morbid asthma will be included in the study, and lung function will be assessed in both groups.

The study duration will be up to approximately 40 weeks per participant, including 4 weeks of screening run-in period, 24 weeks of intervention period, and 12 weeks of follow-up.

Inclusion Criteria:

- A minimum bilateral nasal polyp score of 5 out of a maximum score of 8 for both nostrils (with at least a score of 2 for each nostril) despite use of intranasal corticosteroid treatment for at least 2 months prior to screening

Ongoing symptoms for at least 2 months prior to screening, including:

• Nasal congestion, blockage, or obstruction with moderate or severe symptom severity at screening (Score 2 or 3 on NC Score) and a weekly average severity score of at least 1 (range 0 to 3) at randomization (NC Score: 0=no symptoms, 1=mild, 2=moderate, and 3=severe).
• At least 1 of the following 2 symptoms: (1) partial loss of smell (hyposmia) or total loss of smell (anosmia); (2) anterior and/or posterior rhinorrhea.

Exclusion Criteria:

Participants are excluded from the study if any of the following criteria apply:

• Patient who has received any therapies such as for example systemic corticosteroids, anti-IgE therapy, monoclonal antibody and some others in the specified timeframe(s) prior to the screening visit
• Patients who have undergone any nasal/sinus surgery within 6 months before screening or for whom NPS cannot be determined accurately on endoscopy due to anatomic changes to the nasal cavity from past nasal/sinus surgery
• Patients with conditions/concomitant diseases making them non evaluable for the primary efficacy endpoint
• Signs or a CT scan suggestive of Allergic fungal rhinosinusitis
• Active/chronic helminthic infection
• History of human immunodeficiency virus (HIV) infection or positive HIV screen (Anti-HIV- and HIV-2 antibodies) at screening visit
• Patients with positive or indeterminate hepatitis B surface antigen (HBsAg), hepatitis B core antibody (HBcAb), or hepatitis C antibody at screening visit NOTE: The above information is not intended to contain all considerations relevant to a patient's potential participation in a clinical trial

Qualified researchers may request access to patient level data and related study documents including the clinical study report, study protocol with any amendments, blank case report form, statistical analysis plan, and dataset specifications. Patient level data will be anonymized and study documents will be redacted to protect the privacy of trial participants. Further details on Sanofi's data sharing criteria, eligible studies, and process for requesting access can be found at: https://vivli.org