Wald

Non-small cell lung cancer (NSCLC) survivors often experience ongoing physical and psychological challenges, including fatigue and breathing difficulties, which reduce their overall health-related quality of life (HRQoL). This research evaluates whether a digital lifestyle intervention can improve HRQoL in these survivors over three months. The study focuses on enhancing physical activity, nutrition, and breathing or relaxation practices through a mobile application designed specifically for NSCLC survivors. Participants in the intervention group will receive access to a personalized and interactive mobile app for three months after completing rehabilitation or cancer treatment. The program includes behavior change techniques such as goal setting, feedback, knowledge shaping, and behavior comparison. A single virtual session at the start helps participants familiarize themselves with the app and sets their program level. There are no face-to-face appointments during the intervention period. Throughout the study, researchers will monitor participants' health-related quality of life from the start until three months later. Participants must have access to a smartphone or tablet and understand German to follow the study materials and assessments. Data collection includes self-reported outcomes via the app, and safety and participation are overseen by the study team. The total involvement lasts for the three-month intervention period after treatment or rehabilitation completion.