Venous Thromboembolism in Advanced Lung Cancer

Inclusion Criteria: * Age ≥ 18 years at the time of screening. * Eastern Cooperative Oncology Group performance status of ≤ 2. * Written informed consent obtained from the patient. * Histologically and cytologically documented Stage 3B-4 lung cancer (according to Version 8 of the International Association for the Study of Lung Cancer Staging system). * Patients with stage 1 to 3, who undergo radical therapy with disease free survival (DFS) \>12 months. * Willingness and ability to comply with scheduled visits and other study procedures. Exclusion Criteria: * History of another primary malignancy except for malignancy treated with curative intent with known active disease ≥ 5 years before date of the informed consent. * Without signed informed consent. * Unwillingness or inability to comply with scheduled visits or other study procedures. * Previously diagnosed with VTE before signing informed consent.