Obesity is related to an increased risk of several forms of cancer. However, findings from studies on haematological malignancies are inconsistent.
We used prospectively collected data from two Swedish twin cohorts and the Finnish Twin Cohort (in total 70,067 persons) to study the effects of overweight and obesity on the development of leukaemia, non-Hodgkin lymphoma, Hodgkin’s lymphoma and myeloma. The cohorts were followed from baseline through 2002 (Sweden) and through 2004 (Finland).
We found a risk increase of myeloma with a relative risk (RR) of 2.1 (95% confidence interval [CI] 1.1–3.7) among obese persons, a RR of 2.5 (1.0–6.2) for chronic myeloid leukaemia and a RR of 2.7 (0.8–9.6) for acute lymphoblastic leukaemia among overweight persons as compared to normal-weighted ones.
Our results add further evidence suggesting that overweight and obesity may have an impact on some haematological malignancies, in particular myeloma.
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Published online: December 17, 2008
Accepted: November 6, 2008
Received in revised form: October 27, 2008
Received: July 5, 2008
© 2008 Elsevier Ltd. Published by Elsevier Inc. All rights reserved.