Introduction
tumor, primary malignant, non-metastatic osteosarcoma
LUNG METASTASIS, OSTEOSARCOMA, METASTATIC OSTEOSARCOMA
Osteosarcoma, the most common primary malignant bone tumor occurs in adolescence and those aged > 60 years [Compared to an improvement of long-term survival from 20% to over 70% among non-metastatic osteosarcoma patients, the survival of metastatic osteosarcoma patients remains poor, with only about 20% to 30% [Currently, a few studies explored the risk factors of lung metastasis occurrence and constructed predictive models [