Progress in the study of therapeutic strategies for hepatoblastoma in children

Table 1 Pre-treatment staging system

Stage	Specifics
PRETEXT/POST-TEXT I	Only one liver section is involved by the tumor
PRETEXT/POST-TEXT II	Tumor involves two contiguous sections of the liver
PRETEXT/POST-TEXT III	Tumor involves three liver sections, or two non-contiguous sections
PRETEXT/POST-TEXT IV	Tumor involves all four liver sections

Pre-treatment extent of disease and post-chemotherapy pre-surgical stages are based on the number of liver sections involved by the tumor before and after preoperative chemotherapy. PRETEXT: Pre-treatment extent of disease; POST-TEXT: Post-chemotherapy pre-surgical.