Leukaemia and Sellafield: is there a heritable link?

Area of Science:

• Environmental Health
• Genetics
• Epidemiology

Background:

• A statistical association was observed between paternal preconceptional irradiation and childhood leukemia.
• This finding was linked to excess leukemia cases in Seascale, near the Sellafield nuclear installation, and led to legal claims.
• The scientific debate focused on the biological plausibility of a causal link, considering leukemia heritability and genetic risks from irradiation.

Purpose of the Study:

• To investigate the biological plausibility of a causal relationship between paternal preconceptional irradiation and childhood leukemia.
• To evaluate the genetic risks implied by the observed association in light of current knowledge on radiation-induced genetic damage.

Main Methods:

• A comprehensive review of mechanistic issues related to genetic damage and heritability of leukemia.
• Appraisal of existing epidemiological studies on irradiation exposure and childhood leukemia.

Main Results:

• No genetic basis was found to support a causal relationship between paternal preconceptional irradiation and childhood leukemia.
• Recent epidemiological appraisals suggest the association is likely a chance finding.

Conclusions:

• The observed association between paternal preconceptional irradiation and childhood leukemia is unlikely to be causally related.
• The findings suggest that the excess leukemia cases are most likely attributable to chance rather than genetic damage from irradiation.