LUTE and VERSE were replicate, randomised, multicentre, double-blind, placebo-controlled studies (NCT01545440 and NCT01545453). The studies were initially designed to enrol approximately 1400 patients each and to include a 52-week double-blind treatment period (see below for study modification). Patients were randomised in a 1:1:1:1 ratio to receive lebrikizumab 37.5, 125, 250 mg, or placebo subcutaneously every four weeks. Randomisation was stratified by baseline serum periostin level, history of asthma exacerbations within the last 12 months and baseline asthma medications. All patients remained on their standard-of-care therapy that consisted of 500–2000 μg/day ICS therapy (fluticasone propionate dry powder inhaler (DPI) or equivalent) and a second eligible asthma controller medication.