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Additional file 1: Table S1. Univariate analyses for progression-free survival and overall survival in the training cohort. Table S2. Multivariate analyses for progression-free survival and overall survival in the training cohort. Table S3. The Harrell’s C-index for 5-year overall survival prediction. Table S4. The association of serum creatinine level and serum β2M level in all patients. Fig. S1 Kaplan–Meier curves of survival outcomes in the training cohort. Fig. S2 Calibration curves. Fig. S3 Progression-free survival (PFS) for risk groups defined by four prognostic models in the training cohort. Fig. S4 Progression-free survival (PFS) for risk groups defined by four prognostic models in the validation cohort.