A Study to Explore Prognoses of NSCLC Patients Complicated With Oligometastases

Inclusion Criteria: * Pathologically diagnosed patients with non-small cell lung cancer; * Tumor metastases in one organ (no more than 3 metastases); Exclusion Criteria: * Patients with intrapulmonary metastases or multiple primary tumors; * Patients with pleural dissemination or invasion of extrapulmonary organs; * Patients with supraclavicular lymph node metastasis; * Patients with systematic diseases that would influence patient survivals; * Patients with no records for visits;