Literature DB >> 27401727

Adult body mass index and risk of ovarian cancer by subtype: a Mendelian randomization study.

Suzanne C Dixon1, Christina M Nagle2, Aaron P Thrift3, Paul Dp Pharoah4, Celeste Leigh Pearce5, Wei Zheng6, Jodie N Painter7, Georgia Chenevix-Trench8, Peter A Fasching9, Matthias W Beckmann10, Diether Lambrechts11, Ignace Vergote12, Sandrina Lambrechts12, Els Van Nieuwenhuysen12, Mary Anne Rossing13, Jennifer A Doherty14, Kristine G Wicklund15, Jenny Chang-Claude16, Anja Rudolph16, Kirsten B Moysich17, Kunle Odunsi18, Marc T Goodman19, Lynne R Wilkens20, Pamela J Thompson21, Yurii B Shvetsov20, Thilo Dörk22, Tjoung-Won Park-Simon22, Peter Hillemanns22, Natalia Bogdanova23, Ralf Butzow24, Heli Nevanlinna25, Liisa M Pelttari25, Arto Leminen25, Francesmary Modugno26, Roberta B Ness27, Robert P Edwards28, Joseph L Kelley29, Florian Heitz30, Beth Y Karlan31, Susanne K Kjær32, Estrid Høgdall33, Allan Jensen34, Ellen L Goode35, Brooke L Fridley36, Julie M Cunningham37, Stacey J Winham38, Graham G Giles39, Fiona Bruinsma40, Roger L Milne41, Melissa C Southey42, Michelle A T Hildebrandt43, Xifeng Wu43, Karen H Lu44, Dong Liang45, Douglas A Levine46, Maria Bisogna46, Joellen M Schildkraut47, Andrew Berchuck48, Daniel W Cramer49, Kathryn L Terry49, Elisa V Bandera50, Sara H Olson51, Helga B Salvesen52, Liv Cecilie Thomsen52, Reidun K Kopperud52, Line Bjorge52, Lambertus A Kiemeney53, Leon F A G Massuger54, Tanja Pejovic55, Linda S Cook56, Nhu D Le57, Kenneth D Swenerton58, Angela Brooks-Wilson59, Linda E Kelemen60, Jan Lubiński61, Tomasz Huzarski61, Jacek Gronwald61, Janusz Menkiszak62, Nicolas Wentzensen63, Louise Brinton63, Hannah Yang63, Jolanta Lissowska64, Claus K Høgdall65, Lene Lundvall65, Honglin Song66, Jonathan P Tyrer66, Ian Campbell67, Diana Eccles68, James Paul69, Rosalind Glasspool69, Nadeem Siddiqui70, Alice S Whittemore71, Weiva Sieh71, Valerie McGuire71, Joseph H Rothstein71, Steven A Narod72, Catherine Phelan73, Harvey A Risch74, John R McLaughlin75, Hoda Anton-Culver76, Argyrios Ziogas77, Usha Menon78, Simon A Gayther79, Susan J Ramus79, Aleksandra Gentry-Maharaj78, Anna H Wu79, Malcolm C Pike51, Chiu-Chen Tseng79, Jolanta Kupryjanczyk80, Agnieszka Dansonka-Mieszkowska80, Agnieszka Budzilowska80, Beata Spiewankiewicz81, Penelope M Webb2.   

Abstract

BACKGROUND: Observational studies have reported a positive association between body mass index (BMI) and ovarian cancer risk. However, questions remain as to whether this represents a causal effect, or holds for all histological subtypes. The lack of association observed for serous cancers may, for instance, be due to disease-associated weight loss. Mendelian randomization (MR) uses genetic markers as proxies for risk factors to overcome limitations of observational studies. We used MR to elucidate the relationship between BMI and ovarian cancer, hypothesizing that genetically predicted BMI would be associated with increased risk of non-high grade serous ovarian cancers (non-HGSC) but not HGSC.
METHODS: We pooled data from 39 studies (14 047 cases, 23 003 controls) in the Ovarian Cancer Association Consortium. We constructed a weighted genetic risk score (GRS, partial F-statistic = 172), summing alleles at 87 single nucleotide polymorphisms previously associated with BMI, weighting by their published strength of association with BMI. Applying two-stage predictor-substitution MR, we used logistic regression to estimate study-specific odds ratios (OR) and 95% confidence intervals (CI) for the association between genetically predicted BMI and risk, and pooled these using random-effects meta-analysis.
RESULTS: Higher genetically predicted BMI was associated with increased risk of non-HGSC (pooled OR = 1.29, 95% CI 1.03-1.61 per 5 units BMI) but not HGSC (pooled OR = 1.06, 95% CI 0.88-1.27). Secondary analyses stratified by behaviour/subtype suggested that, consistent with observational data, the association was strongest for low-grade/borderline serous cancers (OR = 1.93, 95% CI 1.33-2.81).
CONCLUSIONS: Our data suggest that higher BMI increases risk of non-HGSC, but not the more common and aggressive HGSC subtype, confirming the observational evidence.
© The Author 2016; all rights reserved. Published by Oxford University Press on behalf of the International Epidemiological Association.

Entities:  

Keywords:  Body mass index; Mendelian randomization analysis; obesity; ovarian neoplasms

Mesh:

Substances:

Year:  2016        PMID: 27401727      PMCID: PMC5644573          DOI: 10.1093/ije/dyw158

Source DB:  PubMed          Journal:  Int J Epidemiol        ISSN: 0300-5771            Impact factor:   7.196


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