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Common Genetic Variation In Cellular Transport Genes and Epithelial Ovarian Cancer (EOC) Risk

  • Ganna Chornokur,

    Affiliation Division of Population Sciences, Department of Cancer Epidemiology, Moffitt Cancer Center, Tampa, Florida, United States of America

  • Hui-Yi Lin,

    Affiliation Department of Biostatistics and Bioinformatics, Moffitt Cancer Center, Tampa, Florida, United States of America

  • Jonathan P. Tyrer,

    Affiliation Department of Oncology, University of Cambridge, Strangeways Research Laboratory, Cambridge, UK

  • Kate Lawrenson,

    Affiliation Department of Preventive Medicine, Keck School of Medicine, University of Southern California Norris Comprehensive Cancer Center, Los Angeles, California, United States of America

  • Joe Dennis,

    Affiliation Department of Oncology, University of Cambridge, Strangeways Research Laboratory, Cambridge, UK

  • Ernest K. Amankwah,

    Affiliations Division of Population Sciences, Department of Cancer Epidemiology, Moffitt Cancer Center, Tampa, Florida, United States of America, Clinical and Translational Research Organization, All Children’s Hospital Johns Hopkins Medicine, St Petersburg, Florida, United States of America

  • Xiaotao Qu,

    Affiliation Department of Biostatistics and Bioinformatics, Moffitt Cancer Center, Tampa, Florida, United States of America

  • Ya-Yu Tsai,

    Affiliation Division of Population Sciences, Department of Cancer Epidemiology, Moffitt Cancer Center, Tampa, Florida, United States of America

  • Heather S. L. Jim,

    Affiliation Department of Health Outcomes and Behavior, Moffitt Cancer Center, Tampa, Florida, United States of America

  • Zhihua Chen,

    Affiliation Department of Biostatistics and Bioinformatics, Moffitt Cancer Center, Tampa, Florida, United States of America

  • Ann Y. Chen,

    Affiliation Department of Biostatistics and Bioinformatics, Moffitt Cancer Center, Tampa, Florida, United States of America

  • Jennifer Permuth-Wey,

    Affiliation Division of Population Sciences, Department of Cancer Epidemiology, Moffitt Cancer Center, Tampa, Florida, United States of America

  • Katja KH. Aben,

    Affiliations Radboud University Medical Center, Radboud Institute for Health Sciences, Nijmegen, The Netherlands, Comprehensive Cancer Center The Netherlands, Nijmegen, The Netherlands

  • Hoda Anton-Culver,

    Affiliation Genetic Epidemiology Research Institute, Center for Cancer Genetics Research and Prevention, University of California Irvine, Irvine, California, United States of America

  • Natalia Antonenkova,

    Affiliation N.N. Alexandrov National Cancer Centre of Belarus, Minsk, Belarus

  • Fiona Bruinsma,

    Affiliation Cancer Epidemiology Centre, Cancer Council Victoria, Melbourne, Australia

  • Elisa V. Bandera,

    Affiliation Cancer Prevention and Control Program, Rutgers Cancer Institute of New Jersey, New Brunswick, New Jersey, United States of America

  • Yukie T. Bean,

    Affiliations Department of Obstetrics & Gynecology, Oregon Health & Science University, Portland, Oregon, United States of America, Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, United States of America

  • Matthias W. Beckmann,

    Affiliation Department of Gynecology and Obstetrics, University Hospital Erlangen, Friedrich-Alexander-University, Erlangen-Nuremberg Comprehensive Cancer Center, Erlangen EMN, Erlangen, Germany

  • Maria Bisogna,

    Affiliation Gynecology Service, Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York, United States of America

  • Line Bjorge,

    Affiliations Department of Gynecology and Obstetrics, Haukeland University Hospital, Bergen, Norway, Centre for Cancer Biomarkers, Department of Clinical Medicine, University of Bergen, Bergen, Norway

  • Natalia Bogdanova,

    Affiliation Radiation Oncology Research Unit, Hannover Medical School, Hannover, Germany

  • Louise A. Brinton,

    Affiliation Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland, United States of America

  • Angela Brooks-Wilson,

    Affiliations Canada's Michael Smith Genome Sciences Centre, BC Cancer Agency, Vancouver, Canada, Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, Canada

  • Clareann H. Bunker,

    Affiliation Department of Epidemiology, University of Pittsburgh Graduate School of Public Health, Pittsburgh, Pennsylvania, United States of America

  • Ralf Butzow,

    Affiliations Department of Obstetrics and Gynecology, University of Helsinki and Helsinki University Central Hospital, Helsinki, HUS, Finland, Department of Pathology, Helsinki University Central Hospital, Helsinki, Finland

  • Ian G. Campbell,

    Affiliations Cancer Genetics Laboratory Research Division, Peter MacCallum Cancer Centre, St Andrews Place, East Melbourne, Australia, Department of Pathology, the University of Melbourne, Parkville, Australia, Sir Peter MacCallum Department of Oncology, University of Melbourne, Parkville, Victoria, Australia

  • Karen Carty,

    Affiliations Department of Gynaecological Oncology, Glasgow Royal Infirmary, Glasgow, United Kingdom, The Beatson West of Scotland Cancer Centre, Glasgow, United Kingdom

  • Jenny Chang-Claude,

    Affiliation German Cancer Research Center (DKFZ), Division of Cancer Epidemiology, Heidelberg, Germany

  • Linda S. Cook,

    Affiliation Division of Epidemiology and Biostatistics, Department of Internal Medicine, University of New Mexico, Albuquerque, New Mexico, United States of America

  • Daniel W. Cramer,

    Affiliation Obstetrics and Gynecology Center, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, United States of America

  • Julie M. Cunningham,

    Affiliation Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, United States of America

  • Cezary Cybulski,

    Affiliation International Hereditary Cancer Center, Department of Genetics and Pathology, Pomeranian Medical University, Szczecin, Poland

  • Agnieszka Dansonka-Mieszkowska,

    Affiliation Department of Pathology, The Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland

  • Andreas du Bois,

    Affiliations Department of Gynaecology and Gynaecologic Oncology, Kliniken Essen-Mitte/ Evang. Huyssens-Stiftung/ Knappschaft GmbH, Essen, Germany, Department of Gynaecology and Gynaecologic Oncology, Dr. Horst Schmidt Kliniken Wiesbaden, Wiesbaden, Germany

  • Evelyn Despierre,

    Affiliation Division of Gynecologic Oncology, Department of Obstetrics and Gynaecology and Leuven Cancer Institute, University Hospitals Leuven, Leuven, Belgium

  • Ed Dicks,

    Affiliation Department of Oncology, University of Cambridge, Strangeways Research Laboratory, Cambridge, UK

  • Jennifer A. Doherty,

    Affiliations Department of Epidemiology, The Geisel School of Medicine Hanover, New Hampshire, United States of America, Program in Epidemiology, Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, University of Washington, Seattle, Washington, United States of America

  • Thilo Dörk,

    Affiliation Gynaecology Research Unit, Hannover Medical School, Hannover, Germany

  • Matthias Dürst,

    Affiliation Department of Gynecology, Jena University Hospital, Friedrich Schiller University, Jena, Germany

  • Douglas F. Easton,

    Affiliations Centre for Cancer Genetic Epidemiology, Department of Oncology, University of Cambridge, Cambridge, United Kingdom, Department of Preventive Medicine, Keck School of Medicine, University of Southern California Norris Comprehensive Cancer Center, Los Angeles, California, United States of America

  • Diana M. Eccles,

    Affiliation Faculty of Medicine, University of Southampton, Southampton, United Kingdom

  • Robert P. Edwards,

    Affiliation Ovarian Cancer Center of Excellence, Womens Cancer Research Program, Magee-Womens Research Institute and University of Pittsburgh Cancer Institute, Pittsburgh, Pennsylvania, United States of America

  • Arif B. Ekici,

    Affiliation Institute of Human Genetics, Friedrich-Alexander-University Erlangen-Nuremberg, Comprehensive Cancer Center Erlangen-Nuremberg, Erlangen, Germany

  • Peter A. Fasching,

    Affiliations Department of Gynecology and Obstetrics, University Hospital Erlangen, Friedrich-Alexander-University, Erlangen-Nuremberg Comprehensive Cancer Center, Erlangen EMN, Erlangen, Germany, University of California at Los Angeles, David Geffen School of Medicine, Department of Medicine, Division of Hematology and Oncology, Los Angeles, California, United States of America

  • Brooke L. Fridley,

    Affiliation Biostatistics and Informatics Shared Resource, University of Kansas Medical Center, Kansas City, Kansas, United States of America

  • Yu-Tang Gao,

    Affiliation Department of Epidemiology, Shanghai Cancer Institute, Shanghai, China

  • Aleksandra Gentry-Maharaj,

    Affiliation Women's Cancer, Institute for Women's Health, University College London, London, United Kingdom

  • Graham G. Giles,

    Affiliations Cancer Epidemiology Centre, Cancer Council Victoria, Melbourne, Australia, Centre for Epidemiology and Biostatistics, School of Population and Global Health, The University of Melbourne, Melbourne, Australia

  • Rosalind Glasspool,

    Affiliation The Beatson West of Scotland Cancer Centre, Glasgow, United Kingdom

  • Marc T. Goodman,

    Affiliations Cancer Prevention and Control, Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California, United States of America, Community and Population Health Research Institute, Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, California, United States of America

  • Jacek Gronwald,

    Affiliation International Hereditary Cancer Center, Department of Genetics and Pathology, Pomeranian Medical University, Szczecin, Poland

  • Patricia Harrington,

    Affiliation Department of Oncology, The Centre for Cancer Epidemiology, University of Cambridge, Strangeways Research Laboratory, Cambridge, United Kingdom

  • Philipp Harter,

    Affiliations Department of Gynaecology and Gynaecologic Oncology, Kliniken Essen-Mitte/ Evang. Huyssens-Stiftung/ Knappschaft GmbH, Essen, Germany, Department of Gynaecology and Gynaecologic Oncology, Dr. Horst Schmidt Kliniken Wiesbaden, Wiesbaden, Germany

  • Alexander Hein,

    Affiliation Department of Gynecology and Obstetrics, University Hospital Erlangen, Friedrich-Alexander-University, Erlangen-Nuremberg Comprehensive Cancer Center, Erlangen EMN, Erlangen, Germany

  • Florian Heitz,

    Affiliations Department of Gynaecology and Gynaecologic Oncology, Kliniken Essen-Mitte/ Evang. Huyssens-Stiftung/ Knappschaft GmbH, Essen, Germany, Department of Gynaecology and Gynaecologic Oncology, Dr. Horst Schmidt Kliniken Wiesbaden, Wiesbaden, Germany

  • Michelle A. T. Hildebrandt,

    Affiliation Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, Texas, United States of America

  • Peter Hillemanns,

    Affiliation Gynaecology Research Unit, Hannover Medical School, Hannover, Germany

  • Claus K. Hogdall,

    Affiliation The Juliane Marie Centre, Department of Gynecology, Righospitalet, University of Copenhagen, Copenhagen, Denmark

  • Estrid Hogdall,

    Affiliations Molecular Unit, Department of Pathology, Herlev Hospital, University of Copenhagen, Copenhagen, Denmark, Department of Virus, Lifestyle and Genes, Danish Cancer Society Research Center, Copenhagen, Denmark

  • Satoyo Hosono,

    Affiliation Department of Preventive Medicine, Kyushu University Faculty of Medical Science, Nagoya, Aichi, Japan

  • Anna Jakubowska,

    Affiliation International Hereditary Cancer Center, Department of Genetics and Pathology, Pomeranian Medical University, Szczecin, Poland

  • Allan Jensen,

    Affiliation Department of Virus, Lifestyle and Genes, Danish Cancer Society Research Center, Copenhagen, Denmark

  • Bu-Tian Ji,

    Affiliation Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland, United States of America

  • Beth Y. Karlan,

    Affiliation Women's Cancer Program at the Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California, United States of America

  • Linda E. Kelemen,

    Affiliation Department of Public Health Sciences, Medical University of South Carolina, Charleston, South Carolina, United States of America

  • Mellissa Kellar,

    Affiliations Department of Obstetrics & Gynecology, Oregon Health & Science University, Portland, Oregon, United States of America, Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, United States of America

  • Lambertus A. Kiemeney,

    Affiliation Radboud University Medical Center, Radboud Institute for Health Sciences, Nijmegen, The Netherlands

  • Camilla Krakstad,

    Affiliations Department of Gynecology and Obstetrics, Haukeland University Hospital, Bergen, Norway, Centre for Cancer Biomarkers, Department of Clinical Medicine, University of Bergen, Bergen, Norway

  • Susanne K. Kjaer,

    Affiliations Department of Virus, Lifestyle and Genes, Danish Cancer Society Research Center, Copenhagen, Denmark, Department of Gynaecology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

  • Jolanta Kupryjanczyk,

    Affiliation Department of Pathology, The Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland

  • Diether Lambrechts,

    Affiliations Vesalius Research Center, VIB, Leuven, Belgium, Laboratory for Translational Genetics, Department of Oncology, University of Leuven, Belgium

  • Sandrina Lambrechts,

    Affiliation Division of Gynecologic Oncology, Department of Obstetrics and Gynaecology and Leuven Cancer Institute, University Hospitals Leuven, Leuven, Belgium

  • Nhu D. Le,

    Affiliation Cancer Control Research, BC Cancer Agency, Vancouver, Canada

  • Alice W. Lee,

    Affiliation Department of Preventive Medicine, Keck School of Medicine, University of Southern California Norris Comprehensive Cancer Center, Los Angeles, California, United States of America

  • Shashi Lele,

    Affiliation Department of Cancer Prevention and Control, Roswell Park Cancer Institute, Buffalo, New York, United States of America

  • Arto Leminen,

    Affiliation Department of Obstetrics and Gynecology, University of Helsinki and Helsinki University Central Hospital, Helsinki, HUS, Finland

  • Jenny Lester,

    Affiliation Women's Cancer Program at the Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California, United States of America

  • Douglas A. Levine,

    Affiliation Gynecology Service, Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York, United States of America

  • Dong Liang,

    Affiliation College of Pharmacy and Health Sciences, Texas Southern University, Houston, Texas, United States of America

  • Boon Kiong Lim,

    Affiliation Department of Obstetrics and Gynaecology, University Malaya Medical Centre, University Malaya, Kuala Lumpur, Malaysia

  • Jolanta Lissowska,

    Affiliation Department of Cancer Epidemiology and Prevention, M. Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland

  • Karen Lu,

    Affiliation Department of Gynecologic Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, United States of America

  • Jan Lubinski,

    Affiliation International Hereditary Cancer Center, Department of Genetics and Pathology, Pomeranian Medical University, Szczecin, Poland

  • Lene Lundvall,

    Affiliation The Juliane Marie Centre, Department of Gynecology, Righospitalet, University of Copenhagen, Copenhagen, Denmark

  • Leon F. A. G. Massuger,

    Affiliation Department of Gynaecology, Radboud University Medical Center, Nijmegen, The Netherlands

  • Keitaro Matsuo,

    Affiliation Department of Preventive Medicine, Kyushu University Faculty of Medical Science, Nagoya, Aichi, Japan

  • Valerie McGuire,

    Affiliation Department of Health Research and Policy—Epidemiology, Stanford University School of Medicine, Stanford, California, United States of America

  • John R. McLaughlin,

    Affiliation Public Health Ontario, Toronto, Canada

  • Iain McNeish,

    Affiliation Institute of Cancer Sciences, University of Glasgow, Wolfson Wohl Cancer research Centre, Beatson Institute for Cancer Research, Glasgow, UK

  • Usha Menon,

    Affiliation Women's Cancer, Institute for Women's Health, University College London, London, United Kingdom

  • Roger L. Milne,

    Affiliation Cancer Epidemiology Centre, Cancer Council Victoria, Melbourne, Australia

  • Francesmary Modugno,

    Affiliations Department of Epidemiology, University of Pittsburgh Graduate School of Public Health, Pittsburgh, Pennsylvania, United States of America, Women's Cancer Research Program, Magee-Women's Research Institute and University of Pittsburgh Cancer Institute, Pittsburgh, Pennsylvania, United States of America, Department of Obstetrics, Gynecology and Reproductive Sciences, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States of America

  • Kirsten B. Moysich,

    Affiliation Department of Cancer Prevention and Control, Roswell Park Cancer Institute, Buffalo, New York, United States of America

  • Roberta B. Ness,

    Affiliation The University of Texas School of Public Health, Houston, Texas, United States of America

  • Heli Nevanlinna,

    Affiliation Department of Obstetrics and Gynecology, University of Helsinki and Helsinki University Central Hospital, Helsinki, HUS, Finland

  • Ursula Eilber,

    Affiliation German Cancer Research Center (DKFZ), Division of Cancer Epidemiology, Heidelberg, Germany

  • Kunle Odunsi,

    Affiliation Department of Gynecologic Oncology, Roswell Park Cancer Institute, Buffalo, New York, United States of America

  • Sara H. Olson,

    Affiliation Department of Epidemiology and Biostatistics, Memorial Sloan-Kettering Cancer Center, New York, New York, United States of America

  • Irene Orlow,

    Affiliation Department of Epidemiology and Biostatistics, Memorial Sloan-Kettering Cancer Center, New York, New York, United States of America

  • Sandra Orsulic,

    Affiliation Women's Cancer Program at the Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California, United States of America

  • Rachel Palmieri Weber,

    Affiliation Department of Community and Family Medicine, Duke University Medical Center, Durham, North Carolina, United States of America

  • James Paul,

    Affiliation The Beatson West of Scotland Cancer Centre, Glasgow, United Kingdom

  • Celeste L. Pearce,

    Affiliations Department of Preventive Medicine, Keck School of Medicine, University of Southern California Norris Comprehensive Cancer Center, Los Angeles, California, United States of America, Department of Epidemiology, University of Michigan School of Public Health,Ann Arbor, Michigan, United States of America

  • Tanja Pejovic,

    Affiliations Department of Obstetrics & Gynecology, Oregon Health & Science University, Portland, Oregon, United States of America, Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, United States of America

  • Liisa M. Pelttari,

    Affiliation Department of Obstetrics and Gynecology, University of Helsinki and Helsinki University Central Hospital, Helsinki, HUS, Finland

  • Malcolm C. Pike,

    Affiliations Department of Preventive Medicine, Keck School of Medicine, University of Southern California Norris Comprehensive Cancer Center, Los Angeles, California, United States of America, Department of Epidemiology and Biostatistics, Memorial Sloan-Kettering Cancer Center, New York, New York, United States of America

  • Elizabeth M. Poole,

    Affiliations Channing Division of Network Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, United States of America, Department of Epidemiology, Harvard School of Public Health, Boston, Massachusetts, United States of America

  • Harvey A. Risch,

    Affiliation Department of Chronic Disease Epidemiology, Yale School of Public Health, New Haven, Connecticut, United States of America

  • Barry Rosen,

    Affiliation Department of Gynecology-Oncology, Princess Margaret Hospital, and Department of Obstetrics and Gynecology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada

  • Mary Anne Rossing,

    Affiliation Program in Epidemiology, Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, University of Washington, Seattle, Washington, United States of America

  • Joseph H. Rothstein,

    Affiliation Department of Health Research and Policy- Epidemiology, Stanford University School of Medicine, Stanford, California, United States of America

  • Anja Rudolph,

    Affiliation German Cancer Research Center (DKFZ), Division of Cancer Epidemiology, Heidelberg, Germany

  • Ingo B. Runnebaum,

    Affiliation Department of Gynecology, Jena University Hospital, Friedrich Schiller University, Jena, Germany

  • Iwona K. Rzepecka,

    Affiliation Department of Pathology, The Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland

  • Helga B. Salvesen,

    Affiliations Department of Gynecology and Obstetrics, Haukeland University Hospital, Bergen, Norway, Centre for Cancer Biomarkers, Department of Clinical Medicine, University of Bergen, Bergen, Norway

  • Eva Schernhammer,

    Affiliations Channing Division of Network Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, United States of America, Department of Epidemiology, Harvard School of Public Health, Boston, Massachusetts, United States of America

  • Ira Schwaab,

    Affiliation Institut für Humangenetik, Wiesbaden, Germany

  • Xiao-Ou Shu,

    Affiliation Epidemiology Center and Vanderbilt, Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America

  • Yurii B. Shvetsov,

    Affiliation Cancer Epidemiology Program, University of Hawaii Cancer Center, Hawaii, United States of America

  • Nadeem Siddiqui,

    Affiliation Department of Gynaecological Oncology, Glasgow Royal Infirmary, Glasgow, United Kingdom

  • Weiva Sieh,

    Affiliation Department of Health Research and Policy- Epidemiology, Stanford University School of Medicine, Stanford, California, United States of America

  • Honglin Song,

    Affiliation Department of Oncology, University of Cambridge, Strangeways Research Laboratory, Cambridge, UK

  • Melissa C. Southey,

    Affiliation Department of Pathology, the University of Melbourne, Parkville, Australia

  • Beata Spiewankiewicz,

    Affiliation Department of Gynecologic Oncology, The Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland

  • Lara Sucheston,

    Affiliation Department of Cancer Prevention and Control, Roswell Park Cancer Institute, Buffalo, New York, United States of America

  • Soo-Hwang Teo,

    Affiliations Cancer Research Initiatives Foundation, Sime Darby Medical Center, Subang Jaya, Malaysia, University Malaya Cancer Research Institute, University Malaya Medical Centre, University Malaya, Kuala Lumpur, Maylaysia

  • Kathryn L. Terry,

    Affiliation Obstetrics and Gynecology Center, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, United States of America

  • Pamela J. Thompson,

    Affiliations Cancer Prevention and Control, Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California, United States of America, Community and Population Health Research Institute, Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, California, United States of America

  • Lotte Thomsen,

    Affiliation Department of Pathology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

  • Ingvild L. Tangen,

    Affiliations Department of Gynecology and Obstetrics, Haukeland University Hospital, Bergen, Norway, Centre for Cancer Biomarkers, Department of Clinical Medicine, University of Bergen, Bergen, Norway

  • Shelley S. Tworoger,

    Affiliations Obstetrics and Gynecology Center, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, United States of America, Department of Epidemiology, Harvard School of Public Health, Boston, Massachusetts, United States of America

  • Anne M. van Altena,

    Affiliation Department of Gynaecology, Radboud University Medical Center, Nijmegen, The Netherlands

  • Robert A. Vierkant,

    Affiliation Department of Health Science Research, Division of Biomedical Statistics and Informatics, Mayo Clinic, Rochester, Minnesota, United States of America

  • Ignace Vergote,

    Affiliation Division of Gynecologic Oncology, Department of Obstetrics and Gynaecology and Leuven Cancer Institute, University Hospitals Leuven, Leuven, Belgium

  • Christine S. Walsh,

    Affiliation Women's Cancer Program at the Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California, United States of America

  • Shan Wang-Gohrke,

    Affiliation German Cancer Research Center (DKFZ), Division of Cancer Epidemiology, Heidelberg, Germany

  • Nicolas Wentzensen,

    Affiliation Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland, United States of America

  • Alice S. Whittemore,

    Affiliation Department of Health Research and Policy- Epidemiology, Stanford University School of Medicine, Stanford, California, United States of America

  • Kristine G. Wicklund,

    Affiliation Program in Epidemiology, Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, University of Washington, Seattle, Washington, United States of America

  • Lynne R. Wilkens,

    Affiliation Cancer Epidemiology Program, University of Hawaii Cancer Center, Hawaii, United States of America

  • Anna H. Wu,

    Affiliation Department of Preventive Medicine, Keck School of Medicine, University of Southern California Norris Comprehensive Cancer Center, Los Angeles, California, United States of America

  • Xifeng Wu,

    Affiliation Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, Texas, United States of America

  • Yin-Ling Woo,

    Affiliation Department of Obstetrics and Gynaecology, University Malaya Medical Centre, University Malaya, Kuala Lumpur, Malaysia

  • Hannah Yang,

    Affiliation Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland, United States of America

  • Wei Zheng,

    Affiliation Vanderbilt Epidemiology Center, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America

  • Argyrios Ziogas,

    Affiliation Genetic Epidemiology Research Institute, Center for Cancer Genetics Research and Prevention, University of California Irvine, Irvine, California, United States of America

  • Hanis N. Hasmad,

    Affiliation Cancer Research Initiatives Foundation, Sime Darby Medical Center, Subang Jaya, Malaysia

  • Andrew Berchuck,

    Affiliation Department of Obstetrics and Gynecology, Duke University Medical Center, Durham, North Carolina, United States of America

  • Georgia Chenevix-Trench on behalf of the AOCS management group,

    Affiliations QIMR Berghofer Medical Research Institute, Brisbane, Australia, Peter MacCallum Cancer Centre, East Melbourne, Australia

  • Edwin S. Iversen,

    Affiliation Department of Statistics, Duke University, Durham, North Carolina, United States of America

  • Joellen M. Schildkraut,

    Affiliation Cancer Prevention, Detection & Control Research Program, Duke Cancer Institute, Durham, North Carolina, United States of America

  • Susan J. Ramus,

    Affiliation Department of Preventive Medicine, Keck School of Medicine, University of Southern California Norris Comprehensive Cancer Center, Los Angeles, California, United States of America

  • Ellen L. Goode,

    Affiliation Department of Health Science Research, Division of Epidemiology, Mayo Clinic, Rochester, Minnesota, United States of America

  • Alvaro N. A. Monteiro,

    Affiliation Division of Population Sciences, Department of Cancer Epidemiology, Moffitt Cancer Center, Tampa, Florida, United States of America

  • Simon A. Gayther,

    Affiliation Department of Preventive Medicine, Keck School of Medicine, University of Southern California Norris Comprehensive Cancer Center, Los Angeles, California, United States of America

  • Steven A. Narod,

    Affiliation Women's College Research Institute, University of Toronto, Toronto, Ontario, Canada

  • Paul D. P. Pharoah,

    Affiliations Department of Oncology, University of Cambridge, Strangeways Research Laboratory, Cambridge, UK, Department of Public Health and Primary Care, University of Cambridge, Cambridge, United Kingdom

  • Thomas A. Sellers,

    Affiliation Division of Population Sciences, Department of Cancer Epidemiology, Moffitt Cancer Center, Tampa, Florida, United States of America

  •  [ ... ],
  • Catherine M. Phelan

    catherine.phelan@moffitt.org

    Affiliation Division of Population Sciences, Department of Cancer Epidemiology, Moffitt Cancer Center, Tampa, Florida, United States of America

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Common Genetic Variation In Cellular Transport Genes and Epithelial Ovarian Cancer (EOC) Risk

  • Ganna Chornokur, 
  • Hui-Yi Lin, 
  • Jonathan P. Tyrer, 
  • Kate Lawrenson, 
  • Joe Dennis, 
  • Ernest K. Amankwah, 
  • Xiaotao Qu, 
  • Ya-Yu Tsai, 
  • Heather S. L. Jim, 
  • Zhihua Chen
PLOS
x

Abstract

Background

Defective cellular transport processes can lead to aberrant accumulation of trace elements, iron, small molecules and hormones in the cell, which in turn may promote the formation of reactive oxygen species, promoting DNA damage and aberrant expression of key regulatory cancer genes. As DNA damage and uncontrolled proliferation are hallmarks of cancer, including epithelial ovarian cancer (EOC), we hypothesized that inherited variation in the cellular transport genes contributes to EOC risk.

Methods

In total, DNA samples were obtained from 14,525 case subjects with invasive EOC and from 23,447 controls from 43 sites in the Ovarian Cancer Association Consortium (OCAC). Two hundred seventy nine SNPs, representing 131 genes, were genotyped using an Illumina Infinium iSelect BeadChip as part of the Collaborative Oncological Gene-environment Study (COGS). SNP analyses were conducted using unconditional logistic regression under a log-additive model, and the FDR q<0.2 was applied to adjust for multiple comparisons.

Results

The most significant evidence of an association for all invasive cancers combined and for the serous subtype was observed for SNP rs17216603 in the iron transporter gene HEPH (invasive: OR = 0.85, P = 0.00026; serous: OR = 0.81, P = 0.00020); this SNP was also associated with the borderline/low malignant potential (LMP) tumors (P = 0.021). Other genes significantly associated with EOC histological subtypes (p<0.05) included the UGT1A (endometrioid), SLC25A45 (mucinous), SLC39A11 (low malignant potential), and SERPINA7 (clear cell carcinoma). In addition, 1785 SNPs in six genes (HEPH, MGST1, SERPINA, SLC25A45, SLC39A11 and UGT1A) were imputed from the 1000 Genomes Project and examined for association with INV EOC in white-European subjects. The most significant imputed SNP was rs117729793 in SLC39A11 (per allele, OR = 2.55, 95% CI = 1.5-4.35, p = 5.66x10-4).

Conclusion

These results, generated on a large cohort of women, revealed associations between inherited cellular transport gene variants and risk of EOC histologic subtypes.

Introduction

Epithelial ovarian carcinoma (EOC) is the second-most common gynecological malignancy and the leading cause of gynecological cancer-related mortality in the United States and other developed nations [1]. Early stage EOC is accompanied by vague, non-specific symptoms and is difficult to detect. As yet, no EOC screening or early detection strategies have been proven useful in general population [2]. As a consequence, approximately 60% of cases are diagnosed at advanced stages (III-IV), with 5-year overall survival of less than 20% [3]. Given these grim statistics, improved understanding of the etiology of EOC is critical to reducing the associated morbidity and mortality.

An inadequate understanding of genetic and biological etiology of EOC has limited the ability to detect and treat this disease effectively. Disruptions in cellular transport, lead to abnormal levels of trace elements (iron, zinc and copper), hormones and small molecules which impact the expression of key regulatory genes. Aberrant expression of transmembrane transport genes has been associated with increased risk, as well as aggressiveness, of a number of cancers including breast [47], prostate [8], liver [9], colorectal and colon [1012], thyroid [13] and neuroblastoma [14]. Iron is essential for erythropoiesis [15] and the function of the mitochondrial respiratory chain where it plays a key role in electron transport, in the form of iron-sulphur clusters or in heme centers [16]. However, excess iron and copper have been reported to promote the formation of reactive oxygen species (ROS) which damage cellular DNA and support cancer growth [17]. Hydrogen peroxide generated as a byproduct in the mitochondrial respiratory chain, can react with iron or copper and form hydroxyl radicals that are extremely reactive and damaging to the genome [18]. Consistent with these data, transport of the three most abundant transition metals in humans–iron, zinc and copper–has been linked to the etiology of colorectal and liver cancer [9,19] and prostate cancer [20].

Despite the growing evidence that cellular transport processes influence cancer risk, the association of germline genetic variation in cellular transport genes and EOC risk has not been well studied. As histologic subtypes of EOC differ in clinical behavior and biologic and genetic origin [21], we hypothesized that single nucleotide polymorphisms (SNPs) in cellular transport genes are associated with EOC risk and vary by histopathology. This study examined the association of 279 SNPs in 131 cellular transport genes and EOC risk in an international collaboration that included 18,174 case and 26,134 control subjects.

Materials and Methods

Sample and Procedure

The discovery set included DNA samples from 3,761 EOC case subjects and 2,722 control subjects in two ovarian cancer Genome Wide Association Studies (GWAS) in North America and the United Kingdom (UK). Details of these studies have been previously published [22]. In brief, the North American study was comprised of four case-control studies genotyped using the Illumina 610-quad Beadchip Array (1,814 case subjects and 1,867 control subjects) as well as a single case-control study genotyped on the Illumina 317K and 370K arrays (133 case subjects and 142 control subjects). The UK study was comprised of four case-only studies genotyped on the Illumina 610-quad Beadchip Array and two common control sets genotyped on the Illumina 550K array (1,814 case subjects and 713 control subjects).

The replication sample consisted of DNA samples from 14,525 women with invasive EOC and 23,447 control women with European ancestry from 43 sites in the Ovarian Cancer Association Consortium (OCAC). Samples from an additional 1,747 participants with tumors of low malignant potential were also analyzed. Details of the sample QC are provided in Pharoah et al., [22]. This replication set include 89 SER cases and 200 controls of African ancestry, and 249 SER cases and 1574 controls of Asian ancestry.

All research involving human participants has been approved by each study site’s local Institutional Review Board (IRB) according to the principles expressed in the Declaration of Helsinki. Written informed consent was obtained from all of the participants. The permission to use of the data in this study was granted by the University of South Florida (IRB#: Pro00000249).

Gene and SNP Selection

Gene (NCBI) [23], BioCarta [24], GenomeNet [25] and other relevant gene/pathway databases were used to select the candidate genes for inclusion in the transport pathway. Specifically, the search yielded 131 genes involved in transport of trace elements, ions, hormones and small molecules. A total of 5202 SNPs in the selected genes were identified from the Human-610 Quad BeadChip (Illumina). Those SNPs were genotyped in the four ovarian cancer GWAS studies (US GWAS, UK GWAS, COGS and Mayo clinic). The final selection of transport gene SNPs for genotyping in the replication stage was informed according to lowest p-values (cut off p<0.01 was used) by ranking of minimal p-values across four sets of results in the discovery set: 1) North American all histologies, 2) North American serous histology, 3) combined GWAS meta-analysis all histologies, and 4) combined GWAS meta-analysis serous histology. Additional functional SNPs in these genes were also included. In total 299 SNPs were included on the COGS chip of which 279 SNPs (in 131 genes) passed QC (described in detail in Pharoah et al., [22]).

Imputation Analyses

These analyses were based on imputed genotypes from the four ovarian cancer GWAS studies (US GWAS, UK GWAS, COGS and Mayo clinic) with a total of 15,398 invasive EOC case subjects and 30,816 control subjects of white-European ancestry. Imputation of each dataset into the 1000 Genomes Project was performed using IMPUTE2 software [26]. We used the 1000 Genomes Project v3 as the reference with pre-phasing of the data using SHAPEIT [27].

Statistical Analysis

For the discovery set, the North American and UK studies were analyzed separately and four sets of results: 1) North American all histologies, 2) North American serous histology, 3) combined GWAS meta-analysis all histologies, and 4) combined GWAS meta-analysis serous histology were conducted. SNP analyses were performed using unconditional logistic regression under a log-additive model. The last two sets were analyzed using the fixed effects meta-analysis. These analyses were carried out in PLINK [28] by combining results across studies by using the Mantel–Haenszel method [29].

For the replication set, demographic and clinical characteristics of case subjects and control subjects were compared using t-test for continuous variables and chi-square test for categorical variables. Unconditional logistic regression was used to evaluate associations between SNPs and ovarian cancer risk. SNPs were modeled using number of minor alleles as ordinal variables (log-additive model). Per-allele log odds ratios and their 95% confidence intervals were estimated. All analyses were done separately by race groups.

In order to adjust for population substructure, intercontinental ancestry was assigned based on genotype frequencies for European, Asian, and African populations using LAMP software [30] Subjects with greater than 90 percent European ancestry were defined as European; those with greater than 80 percent Asian and African ancestry were defined as being Asian and African, respectively. The set of 37,000 unlinked markers was applied to perform principal-components analysis within each major population subgroup [31].The number of principal components was based on the inflection position of the principal components scree plot. The models for white-European subjects were adjusted for study site and for the first five principal components. For the African American (AA) and Asian (AS) study subjects, the first one and five principal components were included in the models, respectively.

We evaluated associations between candidate SNPs and risk of all invasive EOC (INV), each of the four main histological subtypes (serous (SER); endometroid (END); clear cell (CC); and mucinous (MUC)), and tumors of low malignant potential (LMP). Odds ratios for each histologic subtype were estimated by comparing cases of each subtype to all controls as reference. False discovery rate (FDR) q-value was applied for adjusting multiple comparisons [32]. Associations with a p value < .05 and a false discovery rate (FDR) q-value < .20 were considered statistically significant.

For the imputation set analyses, the meta-analysis using an in-house program written in C++ was carried out for combining results across studies. A fixed effect meta-analysis was used, with the log odds ratio being the estimate for each study and the standard error of this estimate determining the weighting. For each SNP, only the studies with valid estimates for that SNP (i.e. r2 > 0.25) were used in the meta-analysis calculation.

Results

Sample characteristics are described in the S1 Table. As expected, significant differences were observed between case and control subjects on EOC risk factors including age, family history of ovarian cancer, age at menarche, body mass index (BMI), history of oral contraceptive use, and number of full term births (p-values<0.05). The proportion of tumors of SER (57.6%) was higher than that of other subtypes (14.2% END, 7.1% CC, 6.5% MUC, and 14.6% other), which is typical for white-European populations.

Among the 279 cellular transport SNPs genotyped in the replication set, 81 SNPs in 48 genes showed nominally significant (p<0.05) associations with at least one histological subtype (S2 Table). All invasive cancers combined (INV), LMP and the four main histological subtypes (SER [n = 8,369]; END [n = 2,067]; CC [n = 1,024]; and MUC [n = 943]) were analyzed.

The strongest evidence of an association for INV EOC was observed for SNP rs17216603 in the iron transporter gene HEPH (OR = 0.85, 95%CI = 0.77–0.93, P = 2.55x10-4; FDR q-value = 0.065), which was also the most significant SNP associated with SER (P = 1.99x10-4; 95%CI = 0.73–0.91, FDR q-value = 0.054), and LMP subtypes (P = 0.0206) (Table 1). The most significant association for END EOC was rs11563251 within the UGT1A gene cluster (OR = 0.82, 95%CI = 0.73–0.92, P = 6.59x10-4; FDR q-value = 0.177). Only these two SNPs were associated with q-values <0.20. The most significant association for MUC subtype was rs681309, near the SLC25A45 gene (OR = 0.89, 95%CI = 0.81–0.97, P = 0.012). This SNP was also associated with the END subtype (P = 0.0035) and INV EOC (P = 0.029). Association with rs9908917, in the intron of SLC39A11, was observed for LMP cases (OR = 0.85, 95%CI = 0.77–0.93, P = 3.9x10-4). This SNP was also associated with the SER subtype (P = 0.0123) and INV EOC (P = 0.0144). The SNP rs1804495 in SERPINA7 was associated with SER, MUC, CC, INV and LMP (P<0.05), but not END (P>0.05).

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Table 1. The most significant SNPs in the transport pathway genes and risk of EOC by histology, invasiveness, and race/ethnicity1.

https://doi.org/10.1371/journal.pone.0128106.t001

Imputed Variants

In total, 1785 imputed SNPs in six genes (HEPH, MGST1, SERPINA, SLC25A45, SLC39A11 and UGT1A) were examined for association with INV EOC in white-European subjects only. From these, 274 SNPs were found with p-value<0.05 (S3 Table). Across all six genes, the most significant imputed SNP was rs117729793 in SLC39A11 (per allele, OR = 2.55, 95% CI = 1.5–4.35, p = 5.66x10-4). Interestingly, 190 of 274 (~70%) imputed SNPs with p-values < 0.05 were located in or near SLC39A11.

Results in women of African-American (AA) and Asian (AS) ethnicities

We conducted exploratory analyses for other ethnicities and SER EOC. Fourteen SNPs showed significant associations in AS and AA women. Six of the SNPs in the AS women were also significant in the white-European women, compared to two of the 14 SNPs in the AA women. The top SNP in women of Asian ancestry (rs17216603 in HEPH) was shared with the white-European women. The SLC25A45 rs681309 was also shared. SERPINA7 rs1804495 was borderline significant (P = 0.0503), perhaps due to a small sample size. The most significant association in women of AA ancestry was noted at the SNP rs6488840 near to the microsomal glutathione S-transferase 1 (MGST1) gene. In our study, MGST1 rs6488840 was associated with statistically significantly reduced SER EOC risk in women of AA ancestry (OR = 0.55; P = 0.0035). This SNP was of borderline significance in women of white-European (OR = 0.95; P = 0.042), but not Asian (P>0.05), ancestry. In the groups of AS and AA women, no SNPs had FDR q-value <0.20. Results for the top hits across women of different ancestries are presented in Table 2.

Discussion

The development and progression of ovarian cancer is accompanied by aberrant cellular metabolism [33]. Central to cellular metabolic processes are the transport of trace elements and hormones through cellular and nuclear membranes. In this study, we aimed to elucidate whether germline SNPs in cellular transport genes were associated with EOC risk and histopathologic subtype. We detected nominal associations (P<0.05) with 81 SNPs and EOC risk in at least one of the histopathologic subtypes (S3 Table). Associations were noted with rs17216603 in HEPH and SER, INV and LMP subgroups as well as in SER and INV cases in women of white-European and Asian ancestries. The Hephaestin (HEPH) gene encodes a transmembrane copper-dependent ferroxidase (HEPH protein) responsible for dietary iron transport from intestinal enterocytes into the blood stream [3436]. HEPH catalyzes ferrous (F2+) iron reoxidation to its ferric (F3+) state [3738] that can be utilized by the body. The role of iron homeostasis in cancer progression is yet to be fully understood; however depletion of iron stores in cells induces cell cycle arrest and apoptosis, limits the rate of DNA synthesis, and down-regulates expression of various potentially carcinogenic kinases such as cyclins and cyclin-dependent kinases [39]. Additionally, iron is known to facilitate generation of mutagenic reactive oxygen species (ROS) that may drive cancer development and progression [40] as has been observed in colorectal cancer [41]. In silico analysis of HEPH rs17216603 combining results from Snpnexus, SNPinfo and Annovar [4244] showed that this variant results in the substitution of Alanine at residue 598 with Threonine and may lead to reduction or loss of HEPH function. Functional analyses of this SNP and gene will be needed to clarify the impact of this finding. There was no evidence of MAF heterogeneity because the MAF range of rs17216603 across the studies is 2–5%. This SNP was significantly associated with Invasive EOC risk in women of white-European descent (P = 0.0003) for the combined results (Fig 1).

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Fig 1. Forest plot for HEPH rs17216603 across studies.

Squares represent the estimated per-allele odds ratio (OR) for each study. Lines indicate the 95% confidence intervals. Diamond represents the OR estimate and confidence limits. Invasive EOC risk in women of white-European descent only; MAF in controls.

https://doi.org/10.1371/journal.pone.0128106.g001

The SNP rs9908917 lies within an intron of the SLC39A11 gene, and was associated with SER, all INV and LMP EOC. In addition, of the 1785 SNPs in six genes (HEPH, MGST1, SERPINA, SLC25A45, SLC39A11 and UGT1A) imputed from the 1000 Genomes Project and examined for association with INV EOC in white-European subjects, the most significant imputed SNP was rs117729793 in SLC39A11 (per allele, OR = 2.55, 95% CI = 1.5–4.35, p = 5.66x10-4). In The Cancer Genome Atlas (TCGA) data [45], expression of SLC39A11 was significantly higher in ovarian tumors compared to normal tissues (P = 9.99x10-8). Taken together, these data highlight a potential role for this gene in EOC pathogenesis. The solute carrier family 39, member 11 (SLC39A11) is a poorly studied gene belonging to a family of metal ion transporters. SLC39A11 may act as a zinc-influx transporter, although the exact functions of the A11 gene have yet to be experimentally established [46]. Other members of the SLC39 family transport metal ions, such as iron, copper, cadmium and manganese [47].

SNP rs681309, in the intergenic region near SLC25A45, showed significant associations with all INV, MUC, and END and was the most significant SNP among the MUC subtype. The solute carrier family 25 (mitochondrial carrier; adenine nucleotide translocator), member 45 (SLC25A45) belongs to the family of membrane proteins that catalyze the transport of solutes across the inner mitochondrial membrane [48]. While substrates for the SLC25 family carriers include ADP/ATP, amino acids, malate, ornithine, and citruline [49], the predominant substrate(s) for SLC23A45 have not yet been characterized [50], although sequence similarity to SLC25A29 suggests that this protein may be involved in the transport of long-chain fatty acids such as palmitoylcarnitine and acylcarnitine [51]. SLC25A45 is expressed in skeletal muscle, intestine, brain, and testis and is downregulated during ovarian cancer progression [50]. Taken together, these data suggest that additional studies are warranted on the role of SLC25A4 in particular, as well as mitochondria in general, in EOC etiology.

The SNP, rs1804495 in SERPINA7 was associated with all INV, SER, MUC, CC and LMP subtypes, and was the most statistically significant association among the CC subtype. The serpin peptidase inhibitor, clade A (alpha-1 antiproteinase, antitrypsin), member 7 (SERPINA7), also known as thyroxine-binding globulin (TBG), is a protein that binds thyroid hormones thyroxin (T4) and 3,5,3’-triiodothyronine (T3) in circulation [52]. Numerous mutations in SERPINA7 have been identified [5354] leading to partially or completely absent TBG function. The hallmark of TBG deficiency is abnormally low T3 and T4 combined with normal thyroid stimulating hormone (TSH) values [55]. The specific role of SERPINA7 in cancer etiology has not been established; however, thyroid hormones may support cancer growth [56]. Thus, it is conceivable that altered TBG production over many years may modulate growth of early-stage ovarian cancer cells. The index SNP, rs1804495, is coding, but the resulting missense change is predicted to have neutral impact on the protein function, suggesting a linked variant may be the causal allele at this locus. We note that in our analyses, rs1804495 confers statistically significantly increased risk for LMP, INV, SER and CC, but decreased risk for mucinous EOC. This observation highlights observations from previously published studies that reveal differences between MUC and other EOCs [5759].

The most significant association among the END subtype was with UGT1A1 rs11563251. UDP glucuronosyltransferase 1 family, polypeptide A cluster (UGT1A) represents a complex locus which encodes nine human UDP-glucuronosyltransferases. UDP-glucuronosyltransferase (UGT) enzymes are localized to endoplasmic reticulum (ER) and catalyze glucuronidation, which is involved in the elimination of bilirubin, steroids, bile acids, toxic dietary components, and several drugs, including morphine, and irinotecan [6061]. Genetic variation in UGT1A1 is involved in inherited disorders of bilirubin metabolism such as Crigler-Najjar syndrome, which is manifested in complete absence (type 1) or diminished (types 2–3) bilirubin glucuronidation and resulting impaired bilirubin excretion. Previously, the UGT1A7*3 allele exhibited modestly significant association with colorectal cancer (OR = 2.39; P = 0.02) [57], lung cancer [62], endometrial cancer [63] and pancreatic cancer (OR = 1.98; P = 0.003) [64] with a particularly strong association in smokers with pancreatic carcinoma who were younger than 55 years (OR = 4.7; P = 0.0009), suggesting the magnitude of the observed associations may be modified by environmental interactions. Down-regulation of UGT1A appears to be an early event in carcinogenesis [65]; it is postulated that constitutive expression of UGT1A family genes in normal mucosa protects organs from carcinogens released in the bladder or absorbed from the diet in the colon. The rs11563251 variant lies within the 3’UTR of the UGT1A1,-A6 and–A10 genes, and so could feasibly impact the RNA stability of these transcripts. Alternatively, since this SNP also lies within intronic sequences of other UGT1A genes, this SNP could possibly be involved in cis-regulation of expression of one or more genes in this cluster.

In this study we conducted exploratory analyses in AS and AA subjects. However, the power to detect associations in women of non-European ancestries was limited due to small sample size and only the SER subtype of EOC was investigated for risk associations. The top SNPs in the AS ancestry group (rs17216603 in HEPH and rs1552846 in SLC39A11) were also significant in white-European women. In women of AA ancestry, the most significant SNP rs6488840 (P = 0.0035) was close to the microsomal glutathione S-transferase 1 (MGST1) gene, which encodes a protein that catalyzes the conjugation of glutathione to electrophiles and the reduction of lipid hydroperoxides. This protein is localized to the endoplasmic reticulum and outer mitochondrial membrane where it is thought to protect these membranes from oxidative stress. The product of this gene is involved in cellular defenses against toxic, carcinogenic, and pharmacologically active electrophilic compounds [66]. MGST1 overexpression has been demonstrated in various cancers (e.g., prostate cancer and lung cancer [6768]) and has been associated with high metastatic potential and chemoresistance [69]. MGST1 is abundantly expressed in EOC primary tumors, metastases and effusions [66]. Other significant SNPs in women of AA ancestry include various members of the SLC39 family: SLC39A11 (rs9905659 and rs16977431) and SLC39A8 (rs233807).

The main strength of our study is a large sample size of white-European women that afforded sufficient statistical power to detect modest risk differences. Weaknesses, however, include the lack of functional or metabolic studies to establish biological significance of the observed associations. Another weakness is a small sample size in AA and AS women. The contribution of genetic and/or biological differences to EOC among different ethnic groups is unclear. However, because ovarian cancer health disparities are observed along the whole continuum of the disease globally and in the U.S. [70], this topic is without a doubt important and deserves its own dedicated studies.

In summary, we have found that genetic variation in transmembrane transport genes appear to be associated with EOC risk across various histologic subtypes (Table 1). These data suggest that disruptions in cellular transport (trace elements, hormones and small molecules) may play roles in EOC pathogenesis. Functional and metabolic studies are needed to support these findings.

Supporting Information

S1 Table. Demographic and clinical characteristics of white-European case subjects with invasive disease (n = 14,525) and controls (n = 23,447) in the COGS study.

https://doi.org/10.1371/journal.pone.0128106.s001

(DOCX)

S2 Table. Transport pathway SNPs statistically significantly (p<0.05) associated with at least one histopathologic EOC subtype in white-European women.

Significant associations are bolded.

https://doi.org/10.1371/journal.pone.0128106.s002

(DOCX)

S3 Table. Imputed SNPs significantly (p<0.05) associated with INV EOC in white-European women.

SNPs are sorted by p-values.

https://doi.org/10.1371/journal.pone.0128106.s003

(DOCX)

Acknowledgments

Individual acknowledgments by study: We thank all the individuals who took part in this study and all the researchers, clinicians and technical and administrative staff who have made possible the many studies contributing to this work. In particular, we thank: D. Bowtell, A. deFazio, D. Gertig, A. Green, P. Parsons, N. Hayward, P. Webb and D. Whiteman (AUS); G. Peuteman, T. Van Brussel and D. Smeets (BEL); the staff of the genotyping unit, S LaBoissiere and F Robidoux (Genome Quebec); U. Eilber and T. Koehler (GER); L. Gacucova (HMO); P. Schurmann, F. Kramer, W. Zheng, T. W. Park, Simon, K. Beer- Grondke and D. Schmidt (HJO); S. Windebank, C. Hilker and J. Vollenweider (MAY); the state cancer registries of AL, AZ, AR, CA, CO, CT, DE, FL, GA, HI, ID, IL, IN, IA, KY, LA, ME, MD, MA, MI, NE, NH, NJ, NY, NC, ND, OH, OK, OR, PA, RI, SC, TN, TX, VA, WA, and WYL (NHS); L. Paddock, M. King, L. Rodriguez-Rodriguez, A. Samoila, and Y. Bensman (NJO); M. Sherman, A. Hutchinson,N. Szeszenia—‐ Dabrowska, B. Peplonska, W. Zatonski, A. Soni, P. Chao and M. Stagner (POL); C. Luccarini,P. Harrington the SEARCH team and ECRIC (SEA); R. Royer, S. Zhang (TOR); I. Jacobs, M. Widschwendter, E. Wozniak, N. Balogun, A. Ryan and J. Ford (UKO); Carole Pye (UKR); A. Amin Al Olama, K. Michilaidou, K. Kuchenbaker (COGS). Special thanks to the members of the AOCS management group: Penny Webb (QIMR Berghofer Medical Research Institute, Brisbane, Australia); David Bowtell (Peter MacCallum Cancer Centre, Melbourne, VIC); and Anna deFarzio (Westmead Hospital, Westmead, NSW).

Main funding: The scientific development and funding for this project were funded by the following: NIH R01 CA-1491429 (Phelan PI); the US National Cancer Institute (R01-CA076016); the COGS project is funded through a European Commission's Seventh Framework Programme grant (agreement number 223175 HEALTH F2 2009–223175); the Genetic Associations and Mechanisms in Oncology (GAME‐ON): a NCI Cancer Post-GWAS Initiative (U19-CA148112); the Ovarian Cancer Association Consortium is supported by a grant from the Ovarian Cancer Research Fund thanks to donations by the family and friends of Kathryn Sladek Smith (PPD/RPCI.07).

Investigator-specific funding: G.C.-T. is supported by the National Health and Medical Research Council; B.K. holds an ACS Early Detection Professorship (SIOP—‐06—‐258—‐01—‐COUN); L.E.K. is supported by a Canadian Institute of Health Research New Investigator Award (MSH—-87734). AWL is supported by NIEHS T32 training grant (T32ES013678).

Funding of included studies: Funding of the constituent studies was provided by the California Cancer Research Program (00—‐01389V—‐20170, N01—‐CN25403, 2II0200); the Canadian Institutes of Health Research (MOP—-86727); Cancer Australia; Cancer Council Victoria; Cancer Council Queensland; Cancer Council New South Wales; Cancer Council South Australia; Cancer Council Tasmania; Cancer Foundation of Western Australia; the Cancer Institute of New Jersey; Cancer Research UK (C490/A6187, C490/A10119, C490/A10124); the Danish Cancer Society (94—‐222—‐52); the ELAN Program of the University of Erlangen—‐Nuremberg; the Eve Appeal; the Helsinki University Central Hospital Research Fund; Helse Vest; the Norwegian Cancer Society; the Norwegian Research Council; the Ovarian Cancer Research Fund; Nationaal Kankerplan of Belgium; Grant—‐in—‐Aid for the Third Term Comprehensive 10—‐Year Strategy For Cancer Control from the Ministry of Health Labour and Welfare of Japan; the L & S Milken Foundation; the Polish Ministry of Science and Higher Education (4 PO5C 028 14, 2 PO5A 068 27); the Roswell Park Cancer Institute Alliance Foundation; the US National Cancer Institute (K07—‐CA095666, K07—‐CA143047,K22—‐CA138563, N01—‐CN55424, N01—-PC67001, N01—‐PC067010, N01—‐PC035137, P01—‐CA017054, P01—‐CA087696, P30—-CA072720, P50—‐CA105009, P50-CA136393, R01—‐CA014089, R01—‐CA016056, R01—‐CA017054, R01—‐CA049449, R01—‐CA050385, R01—‐CA054419, R01—‐ CA058598, R01—‐CA058860, R01—‐CA061107, R01—‐CA061132, R01—‐CA067262, R01—‐CA071766, R01—‐CA074850, R01—‐CA080742, R01—‐CA080978, R01—‐CA083918, R01—‐CA087538, R01—‐CA092044, R01—‐095023, R01—‐CA122443, R01—‐CA112523, R01—‐CA114343, R01—‐CA126841, R01—‐CA136924, R03—‐CA113148, R03—‐CA115195, U01—‐CA069417, U01—‐CA071966 and Intramural research funds); the US Army Medical Research and Material Command (DAMD17—‐01—‐1—‐0729, DAMD17—‐02—‐1—‐0666, DAMD17—‐02—‐1—‐0669, W81XWH—-07—-0449, W81XWH—‐10—‐1—‐02802); the US Public Health Service (PSA—-042205); The National Health and Medical Research Council of Australia (199600 and 400281); the German Federal Ministry of Education and Research of Germany Programme of Clinical Biomedical Research (01GB 9401); the State of Baden—‐Wurttemberg through Medical Faculty of the University of Ulm (P.685); the Minnesota Ovarian Cancer Alliance; the Mayo Foundation; the Fred C. and Katherine B. Andersen Foundation; the Lon V. Smith Foundation (LVS—‐39420); the Oak Foundation; the OHSU Foundation; the Mermaid I project; the Rudolf—‐Bartling Foundation; the UK National Institute for Health Research Biomedical Research Centres at the University of Cambridge, Imperial College London, University College Hospital “Womens Health Theme” and the Royal Marsden Hospital; WorkSafeBC 14.

Author Contributions

Conceived and designed the experiments: CMP GC JPT KL JD HYL EKA HSLJ PDP TAS YYT SAN SAG ANAM ELG SJR JMS ESI GCT AB HNH HAR HS DFE BLF JMC. Performed the experiments: CMP GC SJR JMC PDP KL EKA HSLJ. Analyzed the data: PDP HYL YYT JPT EKA GC XQ ZC AYC. Contributed reagents/materials/analysis tools: GC HYL JPT KLu JD EKA XQ YYT HSLJ ZC AYC JPW KA HAC NA FB HB EVB YTB MWB MB LB NB LAB ABW CHB RB IC KC JCC PJC LSK DWC JMC CC ADM AdB EDicks EDespierre JAD TD MD DFE DME RPE ABE PAF BLF YTG AGM GGG RG MTG JG PHarrington PHA AH FH MATH PHarter CKH EH SH AJakubowska AJensen BTJ BYK LEK MK LAK CK SKK JLAK CK SKKJ JK DLambrechts SLambrechts NDL AWL SLele AL JLubinski DAL DLiang BKL JLissowska KLMatsuo LJ LL LFAGM KM VMG JRM IMN UM RLM FM KBM LN RBN HN SN KO SHO IO SO RPW JP CLP TP LMP MCP EMP HAR BR MAR JHR AR IBR IKR HBS ES IS XOS YBS NS WS HS MCS LS SHT KLT PJT ILT AT SST AMvA RAV IV CSW SWG NW ASW KGW LRW AHW XW YLW HY WZ AZ HNH AB GCT ESI JMS SJR ELG ANAM SAG SAN TAS PDPP CMP. Wrote the paper: GC HYL JPT KLu JD EKA XQ YYT HSLJ ZC AYC JPW KA HAC NA FB HB EVB YTB MWB MB LB NB LAB ABW CHB RB IC KC JCC PJC LSK DWC JMC CC ADM AdB EDicks EDespierre JAD TD MD DFE DME RPE ABE PAF BLF YTG AGM GGG RG MTG JG PHarrington PHA AH FH MATH PHarter CKH EH SH AJakubowska AJensen BTJ BYK LEK MK LAK CK SKK JLAK CK SKKJ JK DLambrechts SLambrechts NDL AWL SLele AL JLubinski DAL DLiang BKL JLissowska KLMatsuo LJ LL LFAGM KM VMG JRM IMN UM RLM FM KBM LN RBN HN SN KO SHO IO SO RPW JP CLP TP LMP MCP EMP HAR BR MAR JHR AR IBR IKR HBS ES IS XOS YBS NS WS HS MCS LS SHT KLT PJT ILT AT SST AMvA RAV IV CSW SWG NW ASW KGW LRW AHW XW YLW HY WZ AZ HNH AB GCT ESI JMS SJR ELG ANAM SAG SAN TAS PDPP CMP.

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