Influence of obesity-related risk factors in the aetiology of glioma.
BACKGROUND: Obesity and related factors have been implicated as possible aetiological factors for the development of glioma in epidemiological observation studies. We used genetic markers in a Mendelian randomisation framework to examine whether obesity-related traits influence glioma risk. This methodology reduces bias from confounding and is not affected by reverse causation. METHODS: Genetic instruments were identified for 10 key obesity-related risk factors, and their association with glioma risk was evaluated using data from a genome-wide association study of 12,488 glioma patients and 18,169 controls. The estimated odds ratio of glioma associated with each of the genetically defined obesity-related traits was used to infer evidence for a causal relationship. RESULTS: No convincing association with glioma risk was seen for genetic instruments for body mass index, waist-to-hip ratio, lipids, type-2 diabetes, hyperglycaemia or insulin resistance. Similarly, we found no evidence to support a relationship between obesity-related traits with subtypes of glioma-glioblastoma (GBM) or non-GBM tumours. CONCLUSIONS: This study provides no evidence to implicate obesity-related factors as causes of glioma.
Disney-Hogg, L; Sud, A; Law, PJ; Cornish, AJ; Kinnersley, B; Ostrom, QT; Labreche, K; Eckel-Passow, JE; Armstrong, GN; Claus, EB; Il'yasova, D; Schildkraut, J; Barnholtz-Sloan, JS; Olson, SH; Bernstein, JL; Lai, RK; Swerdlow, AJ; Simon, M; Hoffmann, P; Nöthen, MM; Jöckel, K-H; Chanock, S; Rajaraman, P; Johansen, C; Jenkins, RB; Melin, BS; Wrensch, MR; Sanson, M; Bondy, ML; Houlston, RS
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