"Update on pediatric primary liver tumors".

Area of Science:

• Pediatric Oncology
• Hepatology
• Cancer Genomics

Background:

• Primary malignant liver neoplasms are rare in children, accounting for 1% of pediatric cancers.
• Hepatoblastoma (HB) and hepatocellular carcinoma (HCC) are the most common primary liver malignancies.
• Malignant mesenchymal and vascular tumors are less common but significant in pediatric liver cancer diagnoses.

Purpose of the Study:

• To provide an overview of diagnostic features for common pediatric liver neoplasms.
• To update on the classification and molecular characterization of pediatric liver tumors.
• To briefly discuss less common pediatric liver tumors relevant to differential diagnosis.

Main Methods:

• Review of current literature and international collaborative efforts (e.g., COG, SIOPEL).
• Incorporation of the new international consensus-based classification of pediatric liver tumors (WHO classification).
• Analysis of clinical, histopathological, and molecular data for pediatric liver neoplasms.

Main Results:

• Hepatoblastoma is the most frequent pediatric liver malignancy, with increasing incidence.
• A new international classification is incorporated into the WHO classification and therapeutic protocols.
• Ongoing research focuses on understanding the biology and improving risk-stratification for pediatric liver tumors.

Conclusions:

• International collaboration has significantly advanced the understanding of pediatric liver tumors, particularly HB.
• Standardized classification and molecular characterization are crucial for diagnosis and treatment.
• Continued research is essential for improving outcomes in rare pediatric liver cancers.