Conclusion
osteosarcoma
OSTEOSARCOMA
Approximately 14.1% of pediatric and young adulthood osteosarcoma patients had SLM at diagnosis. The incidence of this population increased slightly with statistical significance in last decade, mainly in patients with age 10–19 years, male and appendicular location. The survival of these patients was poor, and age, gender, positive lymph nodes, other SSM were associated prognostic factors. More importantly, we developed a visual, clinically operable, and easy-to-interpret nomogram model for predicting the risk of SLM, which could be used in clinic and help clinicians make better decisions.