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05). For patients with abnormal pre-operative tumour markers, normalisation of tumour markers after surgery is an independent prognostic protective factor (hazard ratio (HR) = 0.618; 95% confidence interval (CI) = 0.414-0.921), and patients with both positive post-operative tumour markers had double the risk of overall death (HR = 2.338; 95% CI = 1.071-5.101). Similar results were observed in the internal validation and external validation cohorts. Conclusion Pre-operative tumour markers have a better discriminatory ability for post