[Second neoplasms after malignant diseases in childhood]

Area of Science:

• Pediatric Oncology
• Cancer Epidemiology
• Long-term Cancer Survivorship

Context:

• The German Registry of Childhood Malignancies has collected data since 1980.
• Long-term follow-up of childhood cancer survivors is crucial for understanding late effects.
• Secondary malignancies represent a significant concern for childhood cancer survivors.

Purpose:

• To continuously report and complete data on secondary malignancies in childhood cancer patients.
• To analyze the types and frequencies of secondary malignancies observed in a large cohort.
• To identify specific primary cancer types associated with an increased risk of particular secondary cancers.

Summary:

• The registry has observed 329 patients with second malignant neoplasms.
• Common primary cancers include acute lymphoblastic leukemia (28.6%), brain tumors (12.2%), and retinoblastomas (8.8%).
• Most frequent secondary malignancies are brain tumors (20.1%), acute non-lymphoblastic leukemia (13.1%), osteosarcomas (10.9%), and thyroid carcinomas (6.1%).
• Retinoblastomas and thyroid cancer occur at significantly higher rates as secondary malignancies compared to the general registry population.
• Secondary cancers appear within 10 years in 3% of patients, a twentyfold increase.
• Specific combinations like brain tumors after ALL (8.5%) and osteosarcomas after retinoblastomas (4.9%) are notable.

Impact:

• Identifies specific childhood cancer types with elevated risks for certain secondary malignancies.
• Provides crucial data for improving long-term surveillance and care strategies for childhood cancer survivors.
• Highlights the importance of ongoing data collection and analysis in pediatric oncology research.