| AER | Absolute excess risk |
| CI | Confidence interval |
| CNS | Central nervous system |
| ICCC-3 | International Classification of Childhood Cancer, third revision |
| ICD | International Classification of Diseases |
| ICD-O | International Classification of Diseases for Oncology |
| NCI | National Cancer Institute |
| SIR | Standardized incidence ratio |
| SMR | Standardized mortality ratio |
| SPN | Subsequent primary neoplasm |
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