Aggressive Neuroblastomas Start Growing after Infancy.

Area of Science:

• Oncology
• Epigenetics
• Pediatric Cancer Research

Background:

• Population screening for neuroblastoma in infancy has not reduced mortality.
• This failure is attributed to detecting indolent tumors, not aggressive ones, or late-onset aggressive disease.

Purpose of the Study:

• To estimate patient-specific tumor mitotic and calendar ages in neuroblastoma using an epigenetic clock.
• To understand the onset timing of indolent versus aggressive neuroblastoma subtypes.

Main Methods:

• Utilized an epigenetic mitotic clock based on CpG DNA methylation.
• Analyzed a cohort of unscreened children diagnosed with neuroblastoma.

Main Results:

• Aggressive neuroblastomas (stage 4) predominantly initiated growth after the first year of life, evading infant screening.
• Indolent tumors (stages 1, 2, 3, 4S) often began growth in utero or within the first year, correlating with better survival.
• Aggressive neuroblastomas have a short preclinical phase, rendering frequent screening in older children impractical.

Conclusions:

• Infant screening is ineffective for aggressive neuroblastoma due to late onset.
• Patient-specific tumor age estimation could refine screening windows and improve early detection for cancers with limited screening success.