Molecular Basis of Pediatric Liver Cancer

This study is collecting genetic and biological samples from children and young people who have had liver tumors (cancerous or benign) to understand the molecular causes of pediatric liver cancer. It also invites biological parents and siblings to donate samples for comparison, helping researchers identify inherited risk factors. **You may be eligible if...** - You are under 21 years old and have had (or currently have) a liver tumor — malignant or benign — at any point - OR you are a biological parent or sibling of an eligible child patient - You are willing to provide blood, tissue, or other biological samples **You may NOT be eligible if...** - You have never had a liver tumor or been treated for one - You are a non-biological parent, legal guardian, or step-sibling - You are unwilling to consent to sample collection Talk to your doctor to see if this trial is right for you.