Clinical Data: Key clinical parameters relevant to ESCC management.
Radiotherapy Metrics: Records of the primary gross tumor volume (GTV) to clinical target volume (CTV) margin expansion.
Inflammatory Biomarkers: Pre-treatment and post-treatment values for the neutrophil-to-lymphocyte ratio (NLR), platelet-to-lymphocyte ratio (PLR), and systemic immune-inflammation index (SII).
Prognostic Outcomes: Data on local recurrence-free survival (LRFS).