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

This randomized, multicenter, double-blind, placebo-controlled, parallel-group study will evaluate the efficacy, safety, and tolerability of lebrikizumab in adolescent participants with asthma whose disease remains uncontrolled despite daily treatment with inhaled corticosteroids (ICS) therapy and at least one second controller medication. Participants will be randomized in a 1:1:1 ratio to receive double-blind treatment with either lebrikizumab ('High' or 'Low') or placebo, administered as subcutaneous (SC) every 4 weeks (Q4W) for 52 weeks, in addition to their standard-of-care therapy. This will be followed by an optional 52-week double-blind active-treatment extension. The anticipated time on study treatment is up to 104 weeks. Participants who complete the study to Week 104, discontinue prematurely or decide not to take part in the optional active-treatment extension will transition to the 20-week safety follow-up period.


Eligibility Criteria:
Inclusion Criteria:

* Asthma diagnosis for greater than or equal to (\>/=) 12 months prior to Visit 1
* Bronchodilator response during screening
* Pre-bronchodilator FEV1 of 40 percent (%) - 90% predicted at both Visits 2 and 3
* On high dose ICS therapy for \>/= 6 months prior to Visit 1
* On an eligible second controller medication for 6 months prior to Visit 1
* Uncontrolled asthma as defined by the protocol both during screening and at the time of randomization
* Demonstrated adherence with controller medication during the screening period

Exclusion Criteria:

* History of severe allergic reaction or anaphylactic reaction to a biologic agent or known hypersensitivity to any component of the lebrikizumab injection
* Maintenance oral corticosteroid therapy within 3 months prior to Visit 1
* Treatment with systemic (oral, intravenous \[IV\], or intramuscular \[IM\]) corticosteroids within 4 weeks prior to Visit 1 or during the screening period
* Treatment with intra-articular corticosteroids within 4 weeks prior to Visit 1 or during the screening period or anticipated need for intra-articular corticosteroids during the course of the study
* Infection that meets the following criteria: Any infection requiring hospital admission or requiring treatment with IV or IM antibiotics within 4 weeks prior to Visit 1 or during screening; any active infection that required treatment with oral antibiotics within 2 weeks prior to Visit 1 or during screening; upper or lower respiratory tract infection within 4 weeks prior to Visit 1 or during screening; active parasitic infection or Listeria monocytogenes infection within 6 months prior to Visit 1 or during screening
* History of active tuberculosis requiring treatment
* Known immunodeficiency, including, but not limited to, human immunodeficiency virus (HIV) infection
* Evidence of acute or chronic hepatitis or known liver cirrhosis
* History of cystic fibrosis, bronchiectasis, and/or other clinically significant lung disease other than asthma
* Diagnosis or history of malignancy or current evaluation for potential malignancy
* Current smoker or former smoker with a history of greater than (\>) 10 pack-years
* History of alcohol or drug abuse
* Past and/or current use of any anti- interleukin (IL) -13 or anti-IL-4/IL-13 therapy, including lebrikizumab
* Use of other monoclonal antibody therapy, including omalizumab, within 6 months or 5 drug half-lives (whichever is longer) prior to Visit 1
* Initiation of or change in allergen immunotherapy within 3 months prior to Visit 1 or during screening
* History of bronchial thermoplasty