PMID: 15247136Jul 13, 2004Paper

Number of siblings and risk of Hodgkin's lymphoma

Cancer Epidemiology, Biomarkers & Prevention : a Publication of the American Association for Cancer Research, Cosponsored by the American Society of Preventive Oncology
Ellen T ChangMats Lambe

Abstract

Epidemiologic evidence indicates that risk of Hodgkin's lymphoma (HL) in young adults is associated with correlates of delayed exposure to infection during childhood. In contrast, HL among children and older adults may be associated with earlier childhood infection. This study examines the associations of HL risk with having older or younger siblings. We conducted a case-control study in Sweden comparing 2,140 HL patients identified from the Swedish Cancer Register with 10,024 controls identified from national population registers. The Swedish Multi-Generation Register was used to link individuals to their parents and siblings. Among young adults ages 15 to 39 years, the odds ratios (OR) associated with having one, two, and three or more older siblings, compared with none, were 0.96 [95% confidence interval (CI), 0.82-1.13], 0.88 (95% CI, 0.72-1.09), and 0.72 (95% CI, 0.55-0.93), respectively (P value for trend = 0.01). In contrast, number of older siblings was not associated with HL risk among children or older adults. Number of younger or total siblings, mother's age at birth, and father's occupation were not associated with HL at any age. The decreased risk of young-adult HL did not vary appreciably by age difference or sex ...Continue Reading

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