What can cause liver cancer in a 5 year old child?

Causes of liver tumours
The cause of most primary liver tumours in the western world is unknown. However, in other parts of the world, hepatocellular cancer (HCC) is commonly related to the presence of liver infection. For example, in countries where mothers commonly have hepatitis B, and vaccination is not readily available at birth for their children.

Children who are infected with hepatitis B have a higher risk of developing HCC in late childhood than uninfected children.

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Genetics.