Monitoring and Telecoaching of Physical Activity in Patients With Stage III and IV Non-small Cell Lung Cancer

This study is a prospective non-randomised control study to evaluate the efficacy of a physical activity promotion program on the experience of physical activity in patients with stage III and IV non-small cell lung cancer (NSCLC) with documented disease control (stable disease, partial or complete response defined by RECIST V1.1) at least 6 months after start of first line treatment. The trial will consist of 4 visits. An outpatient clinic visit in which the eligible patients are invited (V1), a screenings visit (V2), a third visit (V3) at which the patients will be divided into the intervention or the control group, according to owning a smartphone and their affinity with it, followed by the start of the intervention consisting of 8 weeks telecoaching by means of an application and step counter and a final visit (V4) 8 weeks after starting up the intervention.