Liver cancer is one of the fastest-growing causes of cancer death around the world.
Every year, hundreds of thousands of people die from the disease, and doctors have been trying for decades to better understand why liver cancer develops and how it can be stopped earlier.
Now, a new study from researchers in Japan has uncovered important clues about the hidden biological processes that may drive liver cancer growth.
The research was published in the Journal of Proteome Research by scientists from Hiroshima University and several medical institutions in Japan. The study focused on hepatocellular carcinoma, often called HCC, which is the most common form of liver cancer in adults.
For many years, scientists knew that viral infections such as hepatitis B and hepatitis C were major causes of liver cancer.
However, in recent years, researchers have noticed that more and more liver cancer patients develop the disease without these viral infections. Instead, many of them have long-term liver problems linked to obesity, diabetes, fatty liver disease, alcohol use, or aging.
Doctors call these conditions chronic liver disease, or CLD. Over time, chronic liver disease can damage liver tissue and create long-lasting inflammation inside the organ. Scientists have suspected that these changes may help trigger cancer, but the exact biological mechanisms were not fully understood.
To investigate the problem, the Japanese research team compared healthy liver tissue with tissue from patients who had chronic liver disease connected to liver cancer. They wanted to understand how liver cells change before cancer fully develops.
The researchers used advanced technology to study gene activity and metabolism inside liver tissue. They examined RNA, which carries genetic instructions inside cells and helps control which genes are active. By comparing gene activity between healthy and diseased tissue, the scientists could identify which biological pathways were behaving abnormally.
At the same time, the team also studied metabolites. Metabolites are tiny molecules created when the body processes food and produces energy. Changes in these molecules can reveal important problems in how cells function.
By combining these two approaches, the researchers discovered several major abnormalities linked to liver cancer development.
One of the biggest findings involved inflammation. The scientists found strong activation of inflammation-related signals in diseased liver tissue. Inflammation is part of the body’s natural defense system and normally helps fight infection or injury. However, when inflammation continues for many years, it can slowly damage healthy cells and tissues.
The researchers believe this long-term inflammation may create an environment that encourages cancer growth. Constant inflammation can stress liver cells, damage DNA, and interfere with the body’s normal repair systems. Over time, these harmful changes may increase the chances of cancer developing.
The study also found major changes linked to aging and metabolism. Some liver tissues showed problems with fatty acid metabolism, which is the process the body uses to break down fats and turn them into energy. These tissues also had abnormal fat buildup and shortages of important metabolites.
Interestingly, the researchers divided chronic liver disease into two different subtypes. One subtype showed especially high levels of inflammation, while the second subtype was more strongly connected to aging-related metabolic problems.
This discovery suggests that liver cancer may not develop in exactly the same way in every person. Different biological problems may drive cancer growth in different patients. Scientists say this could become very important in the future because treatments may eventually be tailored to the specific type of liver abnormalities a person has.
The findings may also help explain why liver cancer rates continue to rise globally. Experts say obesity, diabetes, and fatty liver disease are becoming more common around the world, and these conditions may increase long-term liver inflammation and metabolic damage.
The researchers also explored whether some natural compounds might help reduce harmful liver changes. They pointed to earlier studies involving epigallocatechin gallate, often called EGCG, a natural antioxidant found in green tea.
Previous animal studies suggested that green tea compounds may help reduce inflammation-related pathways linked to chronic liver disease. EGCG appeared to lower some of the harmful inflammatory activity seen in fatty liver disease models.
However, the researchers stressed that much more research is needed before any conclusions can be made about using green tea compounds to prevent liver cancer in people.
The scientists hope their findings could eventually lead to better prevention strategies. Instead of only treating liver cancer after tumors appear, doctors may one day target the earlier inflammation and metabolic abnormalities that help cancer develop in the first place.
The team also believes future treatments may become more personalized. For example, patients whose disease is mainly driven by inflammation might benefit from anti-inflammatory therapies, while people with aging-related metabolic problems may require different approaches.
Liver cancer remains one of the deadliest cancers because it is often discovered at later stages when treatment becomes more difficult. Researchers say prevention and early detection are extremely important for improving survival rates.
The new study provides scientists with a clearer picture of the hidden molecular changes happening inside the liver before cancer develops. Although much more work is still needed, the findings offer hope that better treatments and prevention methods could eventually be created.
If you care about liver health, please read studies that refined fiber is link to liver cancer, and the best and worst foods for liver health.
For more health information, please see recent studies about how to boost your liver naturally, and simple ways to detox your liver.
The study was published in the Journal of Proteome Research.
