Clonal evolution during metastatic spread in high-risk neuroblastoma

Area of Science:

• Genomics
• Cancer Biology
• Pediatric Oncology

Background:

• High-risk neuroblastoma often involves widespread metastasis and relapse, even after intensive treatment.
• Limited understanding exists regarding the genetic and clonal dynamics driving metastatic spread and disease progression.

Purpose of the Study:

• To characterize subtype-specific genetic evolutionary trajectories in neuroblastoma from diagnosis through progression and end-stage metastatic disease.
• To investigate the timing of disease initiation and the mechanisms of relapse and spread.

Main Methods:

• Genomic profiling of 470 sequential and spatially separated samples from 283 patients.
• Clonal tracing to determine disease initiation timing.
• Analysis of genetic alterations at disease-defining loci and pathway mutations.

Main Results:

• Disease initiation was traced to embryogenesis.
• Continuous acquisition of structural variants at key loci (MYCN, TERT, MDM2-CDK4) and convergent evolution of pathway mutations were predominant progression features.
• Metastatic clones were established at diagnosis, capable of dormancy, late relapse, and spread via metastasis-to-metastasis and polyclonal seeding post-therapy.

Conclusions:

• Neuroblastoma evolution is characterized by early metastatic clone establishment and continuous genetic alterations.
• Understanding these evolutionary dynamics is crucial for developing effective therapeutic strategies against high-risk neuroblastoma.