© 1985 Oxford University Press
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Are Maternal Fertility Problems Related to Childhood Leukaemia?
* Dutch Childhood Leukemia Study Group The Hague
** Institute of Epidemiology, Erasmus University Rotterdam
Sophia's Children Hospital, Department of Haematology/Oncology, Erasmus University Rotterdam
An explorative case-control study was conducted in The Netherlands. The cases were obtained from a complete nationwide register of childhood leukaemia (1973–1980). Controls were matched with the cases for year of birth, sex and place of residence.
Information about exposures of the mother to potential risk factors in the year before pregnancy and during pregnancy was collected via mailed questionnaires. The analyses concerned data on 519 patients with acute lymphocytic leukaemia and 507 controls. An association between maternal subfertility and childhood leukaemia might be suggested by several findings. A history of two or more miscarriages (OR 1.6; 95% Cl 1.0–2.7) and fertility problems (OR 6.0 95% Cl 0.9–38.2) were more frequently reported among mothers of cases. The use of oral contraceptives (OC) was significantly higher (OR 1.3; 95% Cl 1.0–1.8) and the duration between discontinuation of OC and the relevant pregnancy was significantly longer. The OR for threatened abortion during the relevant pregnancy was 1.6 (95% Cl 1.0–2.6) and the related use of ‘drugs to maintain pregnancy’ was 1.9; 95% Cl 1.0–3.5. Among known risk factors, an increased OR for diagnostic irradiation was confirmed (OR 2.2; 95% Cl 1.2–3.8). No association between childhood leukaemia and prenatal viral infections, smoking and alcohol was found.
Received 1 September 1984
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