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Using data from the British National Registry of Childhood Tumours, the Oxford Childhood Cancer Research group found that children of older parents have significantly higher chances of having leukaemia.
For women over 40 that risk is double that of mothers age 30 or less. A mother aged between 35 and 39 was 30 per cent more likely to have a child with leukaemia than one aged 25 to 29 and those over 40 were 88 per cent more likely.