A 52-year-old man with a history of cirrhosis presents with a 3 cm hepatic nodule on imaging. Serum alpha-fetoprotein (AFP) is 450 ng/mL. Regarding tumor markers in hepatocellular carcinoma (HCC), all of the following statements are correct EXCEPT:

Explanation

## Key Diagnostic Criteria for HCC **Key Point:** AFP >400 ng/mL is suggestive but NOT diagnostic of HCC in isolation; it requires correlation with imaging criteria (EASL/AASLD guidelines). ### Diagnostic Algorithm for HCC According to EASL and AASLD guidelines, HCC diagnosis in cirrhotic patients depends on nodule size and imaging features: | Nodule Size | Imaging Criterion | AFP Level | Diagnosis | |---|---|---|---| | >20 mm | 1 imaging modality (CT/MRI/US) showing arterial enhancement + washout | Any | HCC | | 10–20 mm | 2 imaging modalities showing arterial enhancement + washout | Any | HCC | | 10–20 mm | 1 imaging modality + AFP >400 ng/mL | >400 | HCC | | <10 mm | Surveillance; repeat imaging | — | Not HCC | **High-Yield:** AFP >400 ng/mL alone does NOT diagnose HCC without imaging confirmation. The combination of imaging + AFP is required for nodules 10–20 mm. ### Why Each Statement Is Correct (Except Option 0) 1. **Option 1 (CORRECT):** AFP is produced by hepatocytes during regeneration (viral hepatitis, cirrhosis, alcoholic liver disease) and benign adenomas. Sensitivity ~60–70% in HCC; specificity ~80–90%. Not diagnostic in isolation. 2. **Option 2 (CORRECT):** Serial AFP trends are more clinically useful than absolute values. A rising AFP in a known HCC patient suggests progression or recurrence; a falling AFP after treatment suggests response. 3. **Option 3 (CORRECT):** DCP (also called PIVKA-II, prothrombin induced by vitamin K absence) is more specific than AFP (~90% specificity). It detects ~30% of AFP-negative HCCs and is particularly useful in small HCCs. **Clinical Pearl:** DCP + AFP together improve diagnostic accuracy; DCP alone may detect HCC when AFP is normal. ### Why Option 0 Is Wrong Option 0 claims AFP >400 ng/mL is diagnostic without imaging confirmation. This violates current EASL/AASLD guidelines, which mandate imaging correlation. A cirrhotic patient with AFP 450 ng/mL and a 3 cm nodule requires imaging confirmation (CT/MRI showing arterial enhancement ± washout) to diagnose HCC. AFP elevation alone, even at high levels, can occur in benign cirrhosis, hepatitis, and regeneration.