Prognostic factors to survival of patients with chondroblastic osteosarcoma

This study was aimed to reveal the changes in survival rates and prognostic factors to survival of chondroblastic osteosarcoma (COS). Patients from the Surveillance, Epidemiology, and End Results (SEER) database were retrieved. Kaplan–Meier survival analysis and Cox proportional hazard model were used during analysis. There were significant differences on overall survival between subtypes of osteosarcoma (P < .001∗). Overall survival of COS did not change significantly during last forty years (P = .610), and cancer-specific survival increased to a plateau in 1980s and then remained stable (P = .058). Younger onset age, patients of white race, well and moderately differentiated tumors, and surgery independently predicted better overall (Hazard ratio [HR]: 1.034, P < .001∗; HR: 0.538, P = .004∗; HR: 0.240, P = .020∗ and HR: 0.350, P < .001∗, respectively) and cancer-specific (HR: 1.031, P = .002∗; HR: 0.592, P = .036∗; HR: 0.098, P = .027∗ and HR: 0.253, P < .001∗, respectively) survival. Metastasis at diagnosis independently predicted worse overall (HR: 3.108, P < .001∗) and cancer-specific (HR: 4.26, P < .001∗) survival compared to no metastasis. Younger onset age, white race, well and moderately differentiated tumors, no metastasis at diagnosis and surgical resection can independently predict better overall and cancer-specific survival of COS.