In some cases these changes may be detected in normal tissues such as liver or blood cells. One of the genes to be studied is known as the APC gene. It is linked with colon cancer in adults. Rarely this gene can be passed on in families which are prone to develop both colon cancer and Hepatoblastoma. We don't know how common changes in this gene are in children with Hepatoblastoma. This study will try and figure out if this gene is commonly changed in Hepatoblastoma.