COMPLIANCE WITH ETHICAL COMMITTEE
Thirty children diagnosed with hepatoblastoma were enrolled in this study, and their parents, when available. Patients are from five different Brazilian‘s institutes: A. C. Camargo Cancer Center, Adolescent and Child with Cancer Support Group (GRAACC), Pediatric Cancer Institute (ITACI), Baleia‘s Hospital and Hospital da Criança Conceição. The Research Ethics Committee of the respective Institutions approved this research using these biological samples, and all samples were collected after informed signed consent was obtained from parents or legal guardians.