Familial neonatal leukaemia.

Recently there has been considerable discussion in the literature about possible genetic factors in the aetiology of leukaemia. These have been summarized and discussed by Steinberg (1960). All authorities agree that it is rare to find more than one case of leukaemia among the children of a family, although cases occurring in cousins, uncle and nephew, etc., are less unusual. An additional feature of interest in the family which we now report is the onset of the disease in the neonatal period in the affected children.