Development and Validation of a Prealbumin-Bilirubin Model for Prognostic Prediction in Intermediate Hepatocellular Carcinoma Undergoing Transarterial Chemoembolization

Purpose To establish and validate a novel prognostic model to predict outcomes for intermediate hepatocellular carcinoma (HCC) patients undergoing transarterial chemoembolization (TACE). Materials and Methods Clinical data from intermediate-stage HCC patients who underwent TACE between January 2007 and December 2020 were retrospectively analyzed. Patients were divided into a training cohort and a validation cohort. Univariate and multivariate analyses identified risk factors associated with overall survival (OS), leading to the development of a predictive model. The model's accuracy, consistency, and clinical utility were validated both internally and externally and compared with the ALBI grading, Platelet-Albumin-Bilirubin (PALBI) grading, Child-Pugh grading, mChild-Pugh grading, and the Model for End-Stage Liver Disease (MELD). Results A total of 737 intermediate-stage HCC patients were included, with 481 in the training cohort and 256 in the validation cohort. Multivariate analysis identified maximum tumor diameter, tumor number, prealbumin, and total bilirubin as independent risk factors for OS. A prealbumin-bilirubin (PABI) predictive model was developed. The PABI model's concordance indices (C-index) in the training and validation cohorts were 0.730 (95% CI: 0.701–0.759) and 0.706 (95% CI: 0.661–0.751), respectively. The area under the curve (AUC) values at 6, 12, 18, and 24 months in both cohorts were above 0.7. Among the six models, the PABI model had the highest C-index (0.713) and the lowest Akaike information criterion (AIC) value (5897.814) and the best performance in clinical decision curve analysis, suggesting better predictive performance and potential clinical utility. Conclusion The PABI nomogram model appears to accurately predict survival in intermediate-stage HCC patients treated with TACE, providing clinicians with a valuable tool for candidate selection and prognosis stratification.