Primary mobile vertebral column sarcomas: Prognostic factors vary by histologic subtypes

Area of Science:

• Oncology
• Orthopedic Surgery
• Epidemiology

Background:

• Primary sarcomas of the mobile spine are rare and associated with poor outcomes.
• Limited data exists due to small sample sizes and heterogeneous patient cohorts.
• Understanding incidence and survival is crucial for improving patient care.

Purpose of the Study:

• To analyze population-based incidence and survival data for primary spinal sarcomas in the United States.
• To identify prognostic factors influencing survival across different histologic subtypes.
• To assess trends in spinal sarcoma survival over the past three decades.

Main Methods:

• Utilized the Surveillance, Epidemiology, and End Result (SEER) database (1975-2017).
• Analyzed data from 712 patients diagnosed with primary spinal sarcoma.
• Employed Kaplan-Meier and Cox Regression analyses to determine survival predictors.

Main Results:

• Spinal sarcoma incidence was 0.019 per 100,000 persons in 2017, with no significant change since 2000.
• The overall 5-year disease-specific survival rate was 57%.
• Osteosarcoma showed the lowest 5-year survival (39%), while chondrosarcoma had the highest (69%).
• Age, grade, and stage were independent predictors of survival for the entire cohort.
• Stage was a critical predictor across all histologic subtypes.
• Age, size, and grade were additional predictors for spinal osteosarcoma, Ewing sarcoma, and chondrosarcoma, respectively.

Conclusions:

• This population-based study provides incidence and survival data for mobile vertebral column sarcomas.
• Survival rates and prognostic factors are highly dependent on histologic subtype.
• There has been a concerning lack of improvement in spinal sarcoma survival over the last 30 years.