The Liver Cancer and Germ Cell Marker
AFP is the fetal equivalent of albumin—it's the main blood protein during fetal development. After birth, AFP should drop to very low levels. When it reappears in adults, it suggests either liver cancer (hepatocellular carcinoma), certain testicular cancers, or liver regeneration from active hepatitis.
What is AFP (Alpha-Fetoprotein)?
AFP is a 69kDa glycoprotein produced by fetal liver and yolk sac. Normal adult level: <10 ng/mL. Used for: (1) HCC surveillance in cirrhotic patients (with ultrasound every 6 months), (2) testicular cancer diagnosis and monitoring, (3) prenatal screening.
↑ What High AFP (Alpha-Fetoprotein) Means
Concerning for hepatocellular carcinoma (HCC) in patients with chronic liver disease, or germ cell tumors (especially non-seminomatous testicular cancer). Also elevated in acute/chronic hepatitis, cirrhosis, and pregnancy.
Common symptoms:
Often asymptomatic early · If HCC: abdominal pain, weight loss, jaundice, ascites · If testicular: painless testicular mass
↓ What Low AFP (Alpha-Fetoprotein) Means
Reassuring in the context of liver disease surveillance.
Common symptoms:
No symptoms
Why It Matters
When normal:
HCC surveillance in cirrhosis (with ultrasound)
Diagnoses and monitors testicular germ cell tumors
AFP >400 in cirrhosis patient: very high HCC probability
Monitors treatment response
Risks if abnormal:
Elevated: HCC, germ cell tumor, hepatitis, cirrhosis
Not specific enough for standalone cancer screening
Normal AFP doesn't exclude HCC (40% of HCC has normal AFP)
What Can Cause Abnormal Levels?
Hepatocellular Carcinoma
35% likelyAFP >400 in a cirrhosis patient is essentially diagnostic. AFP 20-400 is a gray zone.
Germ Cell Tumors
25% likelyNon-seminomatous testicular cancer (yolk sac, embryonal, mixed). AFP is NOT elevated in pure seminoma.
Active Hepatitis
Liver regeneration produces AFP. Active hepatitis B or C elevates it.
Cirrhosis
Mildly elevated AFP is common in cirrhosis without cancer.
Pregnancy
Fetal AFP enters maternal circulation. Maternal serum AFP is part of prenatal screening.
What You Can Do
AFP is a surveillance/diagnostic marker, not a lifestyle target
Impact: Interpret in clinical context \u00B7 Timeline: N/A
If chronic liver disease: AFP + ultrasound every 6 months for HCC surveillance
Impact: Early HCC detection improves survival dramatically \u00B7 Timeline: Every 6 months
If lifestyle changes aren't enough:
If elevated without known cause: liver imaging (CT/MRI with contrast)
Impact: Identifies hepatic lesions \u00B7 Timeline: Urgent
Testicular exam and ultrasound if elevated in young male
Impact: Rules out testicular cancer \u00B7 Timeline: Urgent
Recommended retest: HCC surveillance: every 6 months. Cancer treatment: per protocol.
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