Chest Lymph Node Sampling in Patients With Advanced Lung Cancer to be Treated With Curative-intent Radiation Treatment

Inclusion Criteria: * Patients with oligometastatic non-small cell lung cancer (NSCLC), including a primary lung tumour (± hilar/mediastinal adenopathy) with up to 5 synchronous metastases * Radical treatment intent to all sites is recommended at multi-disciplinary tumour board or by discussion by medical oncologist and radiation oncologist and/or surgeon. * Age 18 years or older * Good performance status (Eastern Cooperative Oncology Group \[ECOG 0-1) with life-expectancy of at least 6 months as determined by enrolling physician * Patient has undergone staging investigations less than 3 months prior to registration. 1. Positron Emission Tomography (PET) / Computed Tomography (CT) and Magnetic Resonance Imaging (MRI) brain (CT brain with contrast if contraindication to MRI) OR 2. CT chest/abdomen, radionucleotide bone scan and MRI of brain (CT brain with contrast if contraindication to MRI) * Pathologic confirmation of NSCLC Exclusion Criteria: * Contraindication to Endobronchial Ultrasound (EBUS) / Endoscopic Ultrasound (EUS) * Unable to provide consent for EBUS/EUS * Contraindication to chest radiotherapy * Pregnant or lactating women