Nervous system: Embryonal tumors: Neuroblastoma.

Neuroblastoma is a clinically heterogenous pediatric cancer of the sympathetic nervous system that originates from neural crest cells. It is the most common extracranial solid tumor in childhood and prognosis ranges from spontaneous tumor regression to aggressive disease resistant to multimodal therapy. Prognosis depends on patient characteristics and tumor biology that determine risk classification. Advancements in therapy reductions are merited for low- and intermediate-risk neuroblastoma patients, who generally have excellent outcomes. Of the patients with high-risk disease, only 50% achieve long-term survival, and therapeutic advancements are needed. Over the past several decades, genomic features such as germline mutations, somatic genetic aberrations, chromosome copy number, transcriptomics, and epigenetics have proven to contribute to the pathogenesis of neuroblastoma. The primary predisposition genes in familial neuroblastoma are ALK and PHOX2B. Sporadic neuroblastoma arises with complex pathogenesis, but chromosomal abnormalities and single-nucleotide polymorphisms have been identified to cooperatively lead to oncogenesis. These advances have led to new therapeutic approaches with the potential to improve outcomes for children with neuroblastoma.