Fig. 1

Multivariable Cox regression analysis of prognostic factors in chondroblastic vs. fibroblastic osteosarcoma (unweighted cohort). Forest plots display hazard ratios (HRs) with 95% confidence intervals (CIs) for overall survival (OS) with red horizontal lines and cancer-specific survival (CSS) with blue horizontal lines. Reference lines at HR = 1 (null effect) are shown as a vertical black line.