Causes and Risk Factors for Liver Cancer
Liver cancer occurs when the DNA in liver cells change (mutate) and cause liver cells to multiple uncontrollably. This results in a mass (tumor) of abnormal, cancerous liver cells. The exact cause of the mutations leading to liver cancer is not yet known, but there are several factors that can increase a person's risk of developing it.
There are different types of liver cancer. The most common is hepatocellular carcinoma (HCC). A less common type in adults is intrahepatic cholangiocarcinoma (ICC). In children, the most common type of liver cancer is hepatoblastoma. Hepatoblastoma occurs primarily in children under age 3 years and is associated with a number of genetic conditions and syndromes.
There are a number of factors that are related to developing liver cancer in adults. These are called risk factors. A risk factor increases the chances of developing a condition compared to a person who does not have the risk factor.
- Some risk factors are non-modifiable, which means a person cannot change or control the factor. Other risk factors are modifiable, which means a person potentially can change or control the factor through health behavior and lower their risk.
- There are some risk factors in common across the liver cancers. There are also some risk factors specific to a type of liver cancer.
It's important to remember that not everyone who has risk factors will develop liver cancer. Additionally, there may be other factors involved in the development of liver cancer that are still being studied by researchers
It's important to note that liver cancer, specifically hepatocellular carcinoma, is among the leading causes of cancer-related deaths worldwide. The most common causes globally include HBV and HCV infections and alcohol use. Despite improvements in diagnosis and treatment strategies, the overall prognosis for liver cancer remains poor. Researchers are actively studying genes, proteins, and RNAs associated with liver cancer to develop more precise treatment options.
- Age: Liver cancer is uncommon in younger adults. HCC and ICC are most often diagnosed in people after age 60 years old.
- Sex Assigned at Birth: People assigned male at birth have a higher risk of developing liver cancer compared to those assigned female at birth.
- Genetics: Certain inherited conditions can increase the risk of developing liver cancer
- For HCC, examples include hereditary hemochromatosis and Wilson's disease. These genetic conditions affect how the body processes iron and copper, respectively, and can lead to an increased risk of HCC.
- For ICC, inherited conditions like primary sclerosing cholangitis, choledochal cysts and familial adenomatous polyposis increase risk.
- Race or Ethnicity: In the U.S., people who are Black, Hispanic, and Asian have higher rates of liver cancer than people who are white.
It's important to remember that these non-modifiable risk factors do not guarantee the development of liver cancer, but they may increase the likelihood. Regular screenings and maintaining a healthy lifestyle can help reduce the overall risk of liver cancer, regardless of these non-modifiable factors.
Liver cancer is a significant health concern worldwide, and it's important to understand the modifiable risk factors associated with it. Modifiable risk factors are those that we have some control over and can make changes to reduce our risk. Here are some modifiable risk factors for liver cancer:
- Chronic infections: Chronic infections such as hepatitis B virus (HBV) and hepatitis C virus (HCV) are known risk factors for liver cancer. These infections can be transmitted through unsafe injection practices, unprotected sex, or mother-to-child during childbirth. It's crucial to get tested and seek appropriate medical care if you suspect you may have been exposed to these viruses.
- Alcohol consumption: Excessive alcohol consumption is another modifiable risk factor for liver cancer. Drinking too much alcohol over time can lead to liver damage and increase the likelihood of developing liver cancer. It's recommended to limit alcohol intake or avoid it altogether to lower the risk.
- Metabolic diseases: Certain metabolic diseases, such as type 2 diabetes and obesity, are associated with an increased risk of liver cancer. Type 2 diabetes is a condition characterized by high blood sugar levels, while obesity refers to excess body weight. Maintaining a healthy weight and managing blood sugar levels through regular exercise and a balanced diet can help reduce the risk.
- Dietary factors: The relationship between diet and liver cancer risk has been studied extensively. High-fat diets have been shown to increase the risk of steatohepatitis (inflammation of the liver due to fat accumulation) and liver cancer in animal studies. Consuming a balanced diet that includes a variety of fruits, vegetables, whole grains, lean proteins, and healthy fats can help reduce the risk.
- Blood glucose levels: Elevated blood glucose levels, commonly seen in individuals with diabetes or prediabetes, have been identified as a modifiable risk factor for liver cancer. Diabetes is defined as fasting blood glucose (FBG) levels above 126 mg/dL. Prediabetes refers to FBG levels between 100-125 mg/dL. Managing blood sugar levels through lifestyle changes, medication if necessary, and regular check-ups can help mitigate this risk factor.
- Additional risk factors for ICC:
- Liver fluke parasitic infections: Eating raw or undercooked fish in East Asia increases risk of infection with specific parasites that are associated with ICC.
- Chemical toxin exposure: Asbestos and radon are examples of toxins that increase risk of ICC
- Having ulcerative colitis
It's important to note that while these modifiable risk factors play a role in liver cancer development, they are not the sole determining factors. By making positive lifestyle choices for liver health in general, such as maintaining a healthy weight, avoiding excessive alcohol consumption, managing chronic infections, and adopting a nutritious diet, individuals can reduce their risk of developing liver cancer. Regular check-ups with healthcare providers are essential for early detection and appropriate management of any underlying conditions or infections that may contribute to liver cancer risk.
To prevent or reduce the chances of getting liver cancer, there are several actions a person can take including:
- Prevent and treat other conditions: Conditions such as hepatitis, diabetes, and cirrhosis can increase the risk of liver cancer. Taking steps to prevent and treat these conditions is important. For example, getting vaccinated for hepatitis B as a newborn can lower the risk of liver cancer in children. It is not yet known if being vaccinated lowers the risk in adults. Treatment options for chronic hepatitis B infection include interferon and nucleos(t)ide analog therapy, which may reduce the risk of developing liver cancer.
- Make lifestyle modifications: Making certain changes to your lifestyle can help reduce the risk of liver cancer. Here are some tips:
- Manage weight: Follow a healthy diet and exercise regularly to maintain a moderate weight. Obesity is linked to an increased risk of liver cancer, as well as other conditions like diabetes and fatty liver disease.
- Limit alcohol consumption: Consider reducing the amount of alcohol you consume or avoiding it altogether. Drinking alcohol can lead to cirrhosis, which is a known risk factor for liver cancer.
- Quit smoking: If you smoke, consider quitting. Smoking is associated with various types of cancers, including liver cancer.
It's important to note that while these actions can help reduce the risk of liver cancer, they are not guaranteed prevention methods. It's always a good idea to talk with a doctor if you have concerns about your risk of developing liver cancer. A healthcare professional can provide additional tips tailored to your specific situation and may recommend a treatment plan to help reduce your risk.