Serum Proteomic Profile Based on the TGF‐β Pathway Stratifies Risk of Hepatocellular Carcinoma

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BACKGROUND: Hepatocellular carcinoma (HCC) is the third leading cause of cancer-related deaths, primarily due to late-stage diagnosis. In this multicenter study, our goal is to identify functional biomarkers that stratify the risk of HCC in patients with cirrhosis (CP) for early diagnosis. METHODS: Five thousand and eight serum proteins (Somascan) were analysed in Cohort A (477 CP, including 125 HCC). Clustering analysis of the TGF-β pathway-associated protein signature was performed in a longitudinal, prospective Cohort B (312 CP, in which 18 cases developed HCC over a 5-year follow-up period). Next, a multivariable prediction model was built using logistic regression analysis of cross-sectional data from a matched subgroup (n = 328, Cohort C). Model performance was 10-fold cross-validated across the entire Cohort A (n = 477). RESULTS: Longitudinal follow-up analysis revealed that patients with elevated TGF-β-related protein signature displayed a five-fold increased risk of developing HCC (9.68% vs. 1.91%). Compared to cirrhosis, serum MSTN, TGFBR2, and AFP levels raised in HCC were validated by ELISA (n = 200, odds ratio = 1.4-2.9, p < 0.05). In Cohort C, 88 proteins were significantly altered in HCC compared to cirrhosis (p < 0.05). The six-protein panel (TGFBR2, MSTN, AFP, COL18A1, GLUL, TP63) displayed a strong performance in the matched cohort C (AUC 0.87, sensitivity 0.88, specificity 0.72), alongside four clinical factors (Age, Sex, BMI, Bilirubin). A 10-fold cross-validation demonstrated a mean AUC of 0.86 in cohort A, with strong predictive power in obese/MASLD/ALD-related patients (AUCs: 0.862-0.921). CONCLUSIONS: The mechanism-based panel effectively stratifies HCC risk in cirrhotic patients, underscoring the need for Phase II/III validation.

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