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Case-Control Study of Childhood Leukaemia and Cancer in Scotland: Findings for Neonatal Intramuscular Vitamin K
Patricia A. McKinney, Edmund Juszczak, Elizabeth Findlay and Katrina Smith
BMJ: British Medical Journal
Vol. 316, No. 7126 (Jan. 17, 1998), pp. 173-177
Published by: BMJ
Stable URL: http://www.jstor.org/stable/25176769
Page Count: 5
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Objective: To test the hypothesis of an association between neonatal intramuscular vitamin K and childhood leukaemia and other cancers. Design: Population based case-control study with data abstracted from hospital records. Setting: Scotland. Subjects: Children aged 0-14 years resident in Scotland from 1991-4 and diagnosed with leukaemia (150), lymphomas (46), central nervous system tumours (79), a range of other solid tumours (142), and a subset of acute lymphoblastic leukaemia (129). Controls were 777 children matched for age and sex, providing 417 matched sets (360 triplets and 57 pairs) for analysis. Main outcome measure: Odds ratios for the risk of childhood leukaemia and cancer and intramuscular vitamin K versus a combined group of oral doses, none, and no record. Results are given for information recorded in medical notes and data supplemented by hospital policy. Results: Odds ratios based on medical record abstractions showed no significant positive association for leukaemias (odds ratio 1.30; 95% confidence interval 0.83 to 2.03), acute lymphoblastic leukaemia (1.21; 0.74 to 1.97), lymphomas (1.06; 0.46 to 2.42), central nervous system tumours (0.74; 0.40 to 1.34), and other solid tumours (0.59; 0.37 to 0.96). There was no association with acute lymphoblastic leukaemia in children aged 1 to 6 years. Imputation of exposure from hospital policy gave similar results. Adjustment for deprivation and type of delivery moved risk estimates closer to unity for all major diagnostic groups. Conclusions: The observation of an increased risk of childhood leukaemia and cancer associated with intramuscular vitamin K is not confirmed by this independent population based study.
BMJ: British Medical Journal © 1998 BMJ