RecruitingClinical trialRelapsed and Refractory Hepatoblastoma: A Prospective Registry and Liver Tumor Research Consortium InitiativeThere are limited data regarding the biology and treatment of relapsed/refractory hepatoblastoma (rrHBL). This project provides the infrastructure for acquisition of biological specimens, imaging, and correlative clinical data to facilitate biology studies and characterization of rrHBL. This registry will collect clinical, demographic, and pathological data, specimens (as available) and imaging from patients with rrHBL, prospectively. Cases are identified through: 1. Existing clinical and/or cancer registry databases 2. Referrals from clinicians, surgeons, or pathologists 3. Families initiating contact with Registry staff directly