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The epidemiology of infant cancers
1CRC Paediatric Group, Christie Hospital & Holt Radium Institute, Manchester, UK.
Insights
Infant cancers, though rare, differ significantly from childhood cancers in type and incidence. These differences suggest unique causes, possibly related to prenatal origins and genetics.
Area of Science:
- Pediatric Oncology
- Developmental Biology
Background:
- Infant cancers constitute less than 0.05% of all malignant neoplasms.
- There are distinct differences in cancer types and incidence rates between infants (<1 year) and older children (1-14 years).
Purpose of the Study:
- To analyze and compare the epidemiological characteristics of cancers in infants versus older children.
- To investigate potential etiological differences based on observed incidence patterns.
Main Methods:
- Comparative analysis of cancer incidence rates and tumor types in infants and children.
- Examination of sex-specific incidence ratios across different age groups.
Main Results:
- The ratio of solid tumors to leukemias is higher in infants (5:1) compared to older children (2:1).
- Neuroblastoma, the most common infant malignancy, is four times more frequent in infants than in older children.
- Embryonal tumors like Wilms', hepatoblastoma, and retinoblastoma show higher rates in infants.
- Sex-specific incidence ratios for leukemia and liver tumors differ between infants and older children.
Conclusions:
- Observed epidemiological distinctions suggest that many infant tumors may have unique etiological origins.
- The early onset and embryonal nature of infant cancers point towards potential prenatal origins and the importance of genetic factors.
Abstract:
Cancers in infants represent less than 0.05% of all malignant neoplasms, but form a particularly interesting group for study. The ratio of solid tumours to leukaemias is 2:1 in children aged 1-14 but 5:1 in infants less than 1 year. The rate for neuroblastoma which is the most common malignancy in infants is four times higher in children aged under 1 year than in 1-14 year olds. Other embryonal tumours, e.g. Wilms', heptablastoma and retinoblastoma also show higher rates in infants. The ratios of incidence in males to females differed in a number of instances in the two age groups, e.g. in leukaemias and liver tumours the male to female ratio is greater than one in 1-14 year old children but less than one in infants. These observations suggest that many infant tumours may be aetiologically distinct. Their early onset and predominantly embryonal nature suggest a pre-natal origin and genetic factors may be important.