This study explores the diagnostic and therapeutic potential of SCN5A, an immunogenic cell death (ICD)-related gene, in hepatocellular carcinoma (HCC). Integrated analysis of four databases identified 62 ICD-associated genes (ICDGs), with SCN5A emerging as a key player linked to HCC prognosis and immune microenvironment modulation. Single-cell RNA sequencing revealed correlations between ICD activity and tumor immune dynamics. Bulk RNA sequencing categorized HCC into distinct molecular subtypes with varied immunological features. Machine learning-based prognostic models highlighted SCN5A's cli...