A 52-year-old man with a history of cirrhosis presents with a 3 cm nodule in the liver on imaging. Regarding tumor markers in this clinical scenario, all of the following are true EXCEPT:

Question

Accepted Answer

A. Serum AFP >400 ng/mL in the setting of a nodule >1 cm in cirrhotic liver is diagnostic of hepatocellular carcinoma without need for biopsy. ## AFP in Hepatocellular Carcinoma: Diagnostic Criteria

**Key Point:** AFP >400 ng/mL is suggestive but NOT diagnostic of HCC in isolation. Diagnosis requires imaging criteria (EASL/AASLD) or biopsy confirmation.

### EASL/AASLD Diagnostic Criteria for HCC:

| Nodule Size | Imaging Findings | AFP | Diagnosis |
|-------------|-----------------|-----|----------|
| >10 mm | Arterial enhancement + washout | Any | HCC |
| 10–20 mm | Arterial enhancement + washout on 2 imaging modalities | Any | HCC |
| >20 mm | Arterial enhancement alone | Any | HCC |
| Any | Imaging alone insufficient | >400 ng/mL | Requires biopsy or repeat imaging |

**Clinical Pearl:** AFP >400 ng/mL supports HCC diagnosis but does NOT replace imaging criteria. A nodule <1 cm with high AFP still requires follow-up imaging.

**High-Yield:** AFP is a **supporting marker**, not a standalone diagnostic tool. Sensitivity is 60–70% in HCC; 30–40% of HCCs are AFP-negative.

Answer

B. AFP levels may be normal in well-differentiated hepatocellular carcinoma, limiting its sensitivity

Answer

C. Serial AFP measurement is more useful than a single value for detecting HCC progression

Answer

D. AFP can be elevated in benign liver disease such as acute hepatitis and cirrhosis alone

A 52-year-old man with a history of cirrhosis presents with a 3 cm nodule in the liver on imaging. Regarding tumor markers in this clinical scenario, all of the following are true EXCEPT:

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