Additionally, the core predictors (SUVmax, β2MG, Platelet, Albumin) remained identical across split-validation approaches (Training set: 0.77 (95% CI: 0.71-0.83); Validation set: C-index = 0.84 (95% CI: 0.76-0.92)), reinforcing their biological/clinical relevance in AITL prognosis (Supplementary Table S2, Supplementary Figure S1). This evidence concerns the gene ALB and angioimmunoblastic T-cell lymphoma.