A Study to Evaluate the Efficacy and Safety of QVM149 (Indacaterol Acetate / Glycopyrronium Bromide / Mometasone Furoate) Versus Salmeterol Xinafoate/Fluticasone Propionate in Children From 12 Years to Less Than 18 Years of Age With Asthma.

This is a double-dummy, double-blind, randomized, parallel-group, 52 weeks, active controlled study to evaluate the efficacy and safety of indacaterol acetate 150 µg / glycopyrronium bromide 50 µg / mometasone furoate 160 µg (QVM149 150/50/160 µg) od in children from 12 to less than 18 years of age with asthma with pre-bronchodilator FEV1 ≥ 60 % and \< 90 % of the predicted normal value for the participant.

The study duration of 60 weeks includes:

* a screening period of up to 15 days * a run-in period of 14 days (run-in medication: salmeterol xinafoate/fluticasone propionate 50/250 µg bid) * a treatment period of 52 weeks (either QVM149 150/50/160 µg od and placebo to salmeterol xinafoate/fluticasone propionate 50/500 µg bid, or salmeterol xinafoate/fluticasone propionate 50/500 µg bid and placebo to QVM149 150/50/160 µg od * a safety follow up period of 30 days during which the participant will be back on standard of care treatment as appropriate.