Real-World Data on the Treatment of Lung Cancer Patients With the Immune-Checkpoint Inhibitor Tislelizumab

Inclusion criteria: * Patient has a histologically confirmed resectable Non-small cell lung cancer in stage II-IIIA with high risk of recurrence according to the 8th edition of the following AJCC staging criteria and is eligible for an R0 resection with curative intent and treatment with Tislelizumab in neoadjuvant and adjuvant setting: 1. Tumor size \>4cm; or tumors of any size with either N1 or N2 status 2. Tumors invading thoracic structures (directly into the visceral pleura, parietal pleura, chest wall, main bronchus, phrenic nerve, mediastinal pleura, parietal pericardium) 3. Tumors \>4cm that cause obstructive atelectasis extending to the hilum and involving parts of the lung, the entire lung or a main bronchus, regardless of the distance to the carina, or that invade the visceral pleura (PL1 or PL2) 4. Tumors with one or more separate nodules in the same lobe as the primary lung carcinoma. OR Patient has a histologically confirmed locally advanced or metastatic lung carcinoma of one of the following subtypes and is eligible for treatment with Tislelizumab in an approved indication: 5. NSCLC, squamous type, and the patient is not a candidate for surgical resection or platinum-based chemoradiation and did not receive prior treatment in palliative setting, 6. NSCLC, non-squamous type with PD-L1 expression on ≥50% of tumor cells and without EGFR- or ALK-positive mutations, and patient is not candidate for surgical resection or platinum-based chemoradiation and did not receive prior treatment in palliative setting, 7. NSCLC, squamous or non-squamous type, and the patient already received prior platinum-based therapy and, if with EGFR- or ALK-positive mutations, also has received targeted therapies, 8. SCLC, extensive-stage, and the patient has not received prior treatment in palliative setting. * A decision for treatment with an authorized Tislelizumab-based regimen has been made by the treating physician before enrolling into ReWoLuTe study. NOTE: Patients who have already received 1-2 cycles of therapy are still eligible for enrollment into the NIS. Patients who intended to be treated in the curative setting and had to switch before the start of an adjuvant treatment to the palliative setting or BSC (e.g. due to progress or other reasons), will not be excluded from study. Exclusion criteria: * The patient has not provided signed informed consent. * The patient is under 18 years of age at the time of providing signed informed consent. * The patient is unable to fully comprehend the implications of study participation.