This is a clinical practice guideline for patients with stage I or stage II non-small cell lung cancer (NSCLC). The guideline provides an overview of treatment options including surgery, radiotherapy, and chemotherapy. Several surgical resection methods are discussed, and comparisons are made between lymph node sampling and lymphadenectomy at the time of surgical resection. The guideline also discusses the impact of ethnicity, geography, and socioeconomic status on survival. Outcomes of interest include survival, recurrence (distant and local), and adverse effects of treatment.