Kaplan–Meier curves depicting disease-specific survival according to S-GRAS score grouping and each S-GRAS component (n = 942). (A) S-GRAS groups 0–1, 2–3, 4–5, and 6–9, (B) ENSAT tumour stage (1–4), (C) Ki67 proliferation index (0–9, 10–19, ≥20), (D) resection status of primary tumour (R0, RX, R1, and R2), (E) age at time of diagnosis (<50, ≥50), (F) symptoms at time of diagnosis. For univariate statistical analysis, see Table 1.