A Study of Lebrikizumab in Participants With Uncontrolled Asthma Who Are on Inhaled Corticosteroids and a Second Controller Medication

Asthma exacerbation is defined as new or increased asthma symptoms (i.e., wheeze, cough, dyspnea, chest tightness, and/or night-time awakening due to these symptoms) that lead to systemic corticosteroid (CS) treatment (oral, intravenous (IV), or intramuscular (IM) CS for ≥ 3 days or an emergency department visit with at least one dose of IV or IM CS) or to hospitalization.

Results are reported as a 'Number' representing the model-adjusted incidence rate of asthma exacerbations per person-year. To account for early discontinuation, for each patient, the time at risk (in years) was computed as the duration of this time period (last day minus first day [in days] plus 1) divided by 365.25. The 'first day' was the day of randomization to the PCP. For patients entering the ATE, the 'last day' was the day prior to ATE randomization. For patients not entering the ATE, the 'last day' was at the last study visit on/prior to Study Day 379 (365 days plus a 14-day window).

FEV1 is the maximal amount of air, which can be forcefully exhaled in one second. Measurements were performed before use of bronchodilator. Reported is the absolute change from baseline in FEV1 to the end of the placebo-controlled period at Week 52.

An asthma exacerbation is defined as new or increased asthma symptoms (including wheeze, cough, dyspnea, chest tightness, and/or night-time awakening due to these symptoms) that lead to treatment with systemic corticosteroids or to hospitalisation. Treatment with systemic corticosteroids is defined as treatment with oral, intravenous (IV), or intramuscular (IM) corticosteroids for at least 3 days or an emergency department visit with at least one dose of IV or IM corticosteroids. Reported is the time to first asthma exacerbation during the 52-week placebo-controlled period.

Urgent health care utilization was defined as hospitalizations, emergency department visits, and acute care visits.

Results are reported as a 'Number' representing the model-adjusted incidence rate of urgent asthma-related HCU events per person-year. To account for early discontinuation, for each patient, the time at risk (in years) was computed as the duration of this time period (last day minus first day [in days] plus 1) divided by 365.25. The 'first day' was the day of randomization to the PCP. For patients entering the ATE, the 'last day' was the day prior to ATE randomization. For patients not entering the ATE, the 'last day' was at the last study visit on/prior to Study Day 379 (365 days plus a 14-day window).

Asthma-specific health-related quality of life was assessed by the overall score of the Standardized AQLQ. The AQLQ is a self-administered test with 32 questions; each with seven possible answers ranging from 1 to 7 with a higher score being more favorable. Total score is calculated as follows: sum of items 1to 32 divided by 32 for a score range of 1 to 7 with a higher score indicating a better outcome. Reported is the change in AQLQ score from baseline to the end of the placebo-controlled period at Week 52.

Reported here is the change in the number of puffs or nebulized treatments of asthma rescue medication from baseline to the end of the PCP at Week 52.

The ACQ-5 is test with 5 questions; each with seven possible answers ranging from 0 to 6 with a lower score being more favorable. Total score range is 0 to 30 with a lower score indicating a better outcome. Reported is the change in ACQ-5 score from baseline to the end of the PCP at Week 52.

The safety population included all participants who received at least one dose of study medication.

An adverse event is any untoward medical occurrence in a participant administered a pharmaceutical product and which does not necessarily have to have a causal relationship with the treatment. An adverse event can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding, for example), symptom, or disease temporally associated with the use of a pharmaceutical product, whether or not considered related to the pharmaceutical product. Preexisting conditions which worsen during a study are also considered as adverse events. The safety population included all participants who received at least one dose of study medication.