11.02.11
Cancer risk from x-ray tests on pregnant women and infants studied
A new study suggests clinicians should exercise caution when using x-rays on pregnant women and children because of the potential of a slight increase in the risk of children developing cancer.
Women of childbearing age are always asked about the possibility of pregnancy before being x-rayed.
The study, published today on bmj.com, “is consistent with what doctors have long suspected”, the journal reported.
The UK-US study found small increases in risk of cancer for children who had x-rays at ages less than three months and in children whose mothers had undergone an x-ray while pregnant. These increases were not statistically significant, however, and the researchers reported no increased risk from ultrasound scans.
Researchers compiled data on 2,690 children with cancer and 4,858 healthy children from the UK Childhood Cancer Study (UKCCS). All children were born between 1976 and 1996. Data on exposure to radiographic and ultrasound examinations were collected from medical records.
A total of 305 children received 319 radiographic and related examinations while in utero and 170 children received 247 diagnostic x-ray examinations in early infancy. A total of 13,723 in utero and 138 early infant ultrasound scans were carried out.
Researchers measured the risk of childhood cancer overall, and leukaemia, lymphoma, and central nervous system tumours specifically.
Results showed a slightly heightened risk following in utero exposure to x-rays for all cancers and for leukaemia, though neither was statistically significant.
Exposure to diagnostic x-rays in early infancy was found to be associated with a small, non-significant extra risk for all cancers and leukaemia, as well as increased risk of lymphoma, but this finding was based on small numbers (only seven cases).
The researchers conclude: “Our results, which indicate possible risks of cancer from radiation at doses lower than those associated with CT scans, suggest a need for cautious use of diagnostic radiation imaging procedures to the abdomen/pelvis of the mother during pregnancy and in children at very young ages.”
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