Cardiopulmonary Exercise Testing in Lung Cancer Patients Before and During Oncological Treatment

Patients with lung cancer often have reduced physical fitness and coexisting health problems, which may limit their ability to tolerate oncological treatment. Standard resting lung and heart tests do not always reflect real-life physical capacity during everyday activities or physical effort. This observational study aims to assess cardiorespiratory fitness in patients with lung cancer before and during standard oncological treatment using cardiopulmonary exercise testing (CPET). CPET is a safe, supervised exercise test that provides objective information on how the heart, lungs, and muscles respond to physical effort. Participants with WHO/ECOG performance status 0-2 will undergo CPET before treatment initiation and again after the early phase of therapy or surgery. The results may help identify patients with reduced physiological reserve and support individualized monitoring during routine clinical care.