This is a non-interventional, retrospective observational study to improve knowledge regarding the diagnosis and treatments of patients who have/had non-small cell lung cancer (NSCLC), either early stage (stage I-II).

Due to heterogeneity of patients with stage I-III Non Small Cell Lung Cancer (NSCLC), there is not a unique common therapeutic approach and there is no consensus about the optimal timing, sequencing and combination of surgery, chemotherapy and radiotherapy across the spectrum of early stage and locally advance disease. Consequently, the choice of local treatment modality can vary across countries and centers.

Inclusion Criteria:

1. Patients with stage I-III NSCLC who have received curative surgery or radiotherapy between January 2018 and June 2019 with available follow-up through January 2021
2. Adult patients (aged ≥ 18 years) at the moment of diagnosis
3. Patients (or their legally acceptable representatives) must have signed and dated the Informed Consent form; privacy Form (ICF). In case of deceased or untraceable patient the investigator before collecting data shall demonstrate and report all necessary measures adopted to contact the patient.

Exclusion Criteria:

1. Patients without availability of medical charts or information required
2. Enrollment in studies imposing a specific patient's management strategy which does not correspond to the site's normal clinical practice.

The study population will consist of patients with early stage and locally advanced NSCLC (stage I-III) who had completed curative treatment planning and subsequent at least 18-months follow-up between January 2018 and January 2021.