Blood test changes during radiation therapy for liver cancer

This research study is looking at how radiation therapy affects circulating tumor DNA (ctDNA)—tiny fragments of cancer DNA that float in your bloodstream—in people being treated for hepatocellular carcinoma (liver cancer). By studying how ctDNA changes during and after radiation therapy, researchers hope to develop a simple blood test that can help doctors know whether your treatment is working, without waiting months for imaging scans to show results.

After radiation therapy, standard imaging scans can stay abnormal for up to a year even when the cancer is actually dead, which makes it hard for doctors to know if treatment worked. A blood test that could be done frequently and shows real-time treatment response would help doctors and patients understand outcomes much sooner.