Development of a Predictive Model for Classifying Immune Checkpoint Inhibitor-Induced Liver Injury Types

Immune checkpoint inhibitors (ICIs) have transformed cancer therapy; however, they are associated with ICI-induced liver injury (ICI-LI), which manifests as hepatocellular, mixed, or cholestatic patterns with variable treatment responses. This study aimed to develop and validate a predictive model to identify ICI-LI type using clinical data available at ICI initiation.

A retrospective analysis of 297 patients with ICI-LI was conducted. Baseline clinical data were analyzed using univariate and multivariate logistic regression to predict ICI-LI types in the training and validation cohorts. A predictive model was developed and validated using receiver operating characteristic (ROC) curve analysis.

Multivariate analysis in the training cohort identified male sex (odds ratio [OR]: 3.33, 95% confidence interval [CI]: 1.57-7.06, p = 0.002), serum albumin levels (OR: 0.42, 95% CI: 0.19-0.91, p = 0.027), and serum alanine aminotransferase (ALT) levels (OR: 0.97, 95% CI: 0.94-0.99, p = 0.015) as significant predictors, along with ICI regimen types selected using the Akaike information criterion. The logistic regression model, expressed as p = 1/{1 + (-(5.02 + 1.20 × (sex [F:0, M:1])) - 0.87 × albumin [g/dL] - 0.03 × ALT [U/L] - 0.9 × (drug [non-anti-cytotoxic T lymphocyte antigen 4 (CTLA-4) related regimen:0, anti-CTLA-4 related regimen:1]))}, achieved an area under the ROC (AUROC) of 0.73 (95% CI: 0.63-0.82) in the training cohort. At a cut-off of 0.86, the sensitivity was 60.3%, specificity 74.4%, positive predictive value 92.3%, and negative predictive value 26.9%. In the validation cohort, the AUROC was 0.752 (95% CI: 0.476-1.00).

This predictive model demonstrates its utility in classifying ICI-LI types.