Parental cancer in an unselected cohort of children with cancer referred to a single centre.

hildren with malignancy (P=0.001), estimated risk 4.1 times. Dividing the mothers by childhood cancer type, showed an increased risk of breast cancer in mothers of children with leukaemia and lymphoma which was not statistically significant (P=0.16), estimated risk 2.2 times in contrast to a highly significant (P < 0.001) increased risk in mothers of children with solid tumours, estimated risk 8.9 times.

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