A Randomized, Double-blind, Placebo-controlled, Parallel-group, Proof-of-Concept (PoC) Study to Assess the Efficacy, Safety and Tolerability of Itepekimab, in Participants With Non-cystic Fibrosis Bronchiectasis

ACT18018 is a multinational, randomized, double-blind, placebo-controlled, parallel-group, Phase 2 study with 3 treatment groups. The purpose of this study is to evaluate efficacy, safety and tolerability with 2 dosing regimens of itepekimab compared with placebo in male and/or female participants with NCFB aged 18 years of age up to 85 years of age (inclusive). Study details include: * The study duration (screening, 24-52-week treatment, 20-week safety follow-up) will be up to 47-77 weeks. * The treatment duration will be up to 24-52 weeks. * The follow-up duration will be 20 weeks. * Site/phone visits are at a monthly interval.