This is a non-interventional, multi-country, multi-site study based on existing data from medical records of patients treated with Gi(l)otrif® as part of the routine treatment according to the approved label. Data from real-world will help to understand if dose modifications are done similar as in LUX-Lung 3 trial and if the outcome on safety and effectiveness are as in trial settings. Furthermore, data on modified starting doses, the underlying reasons and effects on safety and outcome are needed.