How Are AFP and PIVKA-II Used in Liver Cancer Care?

When your doctor orders blood tests for AFP and PIVKA-II (also known as DCP), they are checking for specific tumor markers associated with hepatocellular carcinoma (HCC), the most common type of primary liver cancer. Tumor markers are substances that can sometimes be found at higher levels in the blood when a tumor is present ^[1]. Testing for these markers helps your care team gather more clues, but these blood tests are used as supportive tools alongside imaging scans (like an ultrasound, CT, or MRI)—they do not replace them ^[2][1].

What Are AFP and PIVKA-II?

• AFP (Alpha-fetoprotein): This is a protein normally produced during fetal development. In adults, high levels can be a sign of HCC, but they can also be elevated simply because the liver is actively inflamed or damaged (such as from a hepatitis flare-up or cirrhosis) ^[3].
• PIVKA-II (Protein Induced by Vitamin K Absence or Antagonist-II): Also known as DCP (Des-gamma-carboxy prothrombin), this is an abnormal form of a protein involved in blood clotting. HCC tumors frequently produce this abnormal protein.

Because every tumor is biologically different, some liver cancers might only produce one of these markers, while others produce both, or neither ^[3]. Some studies suggest that PIVKA-II can provide different and complementary information to AFP, and combining both tests may improve detection in certain situations ^[4][5]. However, this is not a universal rule, and their use varies depending on your hospital’s guidelines and laboratory capabilities ^[1].

How Your Care Team May Use These Tests

Depending on your specific situation, your doctor may use one or both of these markers at different times:

1. Aiding in Diagnosis
While a diagnosis of HCC is primarily made using high-quality imaging (like a contrast-enhanced CT or MRI scan), tumor markers can provide extra context ^[6][7]. Elevated levels can raise suspicion, prompting a closer look with scans ^[2]. However, a normal blood test result does not completely rule out cancer (especially if a tumor is small), and an elevated result does not confirm cancer on its own ^[3]. If imaging is not conclusive, your team will rely on expert review, repeat scans, or sometimes a biopsy to make a diagnosis.

2. Tracking Treatment Response
If your markers were elevated before you began treatment, they can be useful for tracking your progress. After treatments like surgery, radiation, or tumor-directed therapies (such as ablation or embolization), your care team may monitor these levels. A significant drop in a previously elevated marker can be an encouraging sign that the tumor is responding to therapy ^[8]. For example, after surgery, doctors sometimes check to see if markers return to normal over a period of 4 to 8 weeks ^[9]. However, this timeline is highly individualized. Marker trends are only one piece of the puzzle, and your response is always judged primarily by follow-up imaging and your overall clinical picture.

3. Monitoring for Recurrence (The Cancer Coming Back)
Once your initial treatment is complete, you will have regular follow-up appointments. Alongside routine imaging, your doctor might check your marker levels ^[10]. If a marker begins to rise, it can sometimes be an early warning signal that prompts your doctor to investigate further ^[11]. Keep in mind that a rise does not automatically mean the cancer has returned; it could also be due to liver inflammation, medication changes, or other non-cancer causes.

Can Other Things Affect the Results?

Yes. It is very common for other factors to influence these test results. A “false positive” occurs when a marker is elevated for a reason other than cancer.

• False positives for PIVKA-II: Levels can be elevated if you have a vitamin K deficiency, are taking certain blood-thinning medications (vitamin K antagonists, such as warfarin), or have cholestasis (jaundice caused by bile buildup) ^[12]. Never stop taking a prescribed blood thinner or other medication without strict instructions from your doctor.
• False positives for AFP: Levels can go up if you have active liver inflammation, such as a flare-up of a viral hepatitis infection, or regenerative liver activity ^[3].

A Note on Laboratory Results
Different laboratories use different equipment and reference ranges. A “normal” value at one lab might be slightly different at another. When tracking your marker trends over time, it is best to use the same laboratory when possible, and always ask your doctor to interpret the numbers in the context of your specific liver health. Waiting for scan and blood test results can be stressful, but remember that no single number defines your outcome.