international neuroblastoma pathology classification: unfavorable histology group, patient 5 years or older, with any subtype of neuroblastoma (schwannian stroma-poor) and any mitosis-karyorrhexis index
international neuroblastoma pathology classification: unfavorable histology group, patient 1.5 yr up to but less than 5 yr, with poorly differentiated neuroblastoma and any mki or differentiating neuroblastoma and intermediate or high mki