Peterson, B., Ontiveros, P., Yu, M. C., Heath, C. W., Bergkvist, L., Baines, C. J., Malone, K., Magnusson, C., Lubin, F., Kungu, A., Kay, C., Pike, M., Siskind, V., Virutamasen, P., Hermon, C., Brêmond, A., Lacaya, L. B., Bain, C., Calle, E. E., Aristizabal, N., Gatei, D., Ngelangel, C. A., Bull, D., Fentiman, I. S., Leske, M. C., Hannaford, P., Pike, M. C., Viladiu, P., Wang, D. Y., Peto, J., White, E., Weinstein, A. L., Theetranont, C., Fraser, G., La Vecchia, C., Martinez, L., Evstifeeva, T., Holck, S., Jin, F., Shearman, R., Nasca, P. C., Wang, Q. S., Stanford, J. L., Chilvers, C. E.D., Tulinius, H., Bishop, T., Coldman, A. J., Salazar, S. B., Gallagher, R. P., Peto, R., Reeves, G., Hiatt, R. A., Kunde, D., Boyle, P., Kenya, P., Molina, R., Salas, O., Negri, E., Liff, J. M., Primic-Zakelj, M., Lee, N., Doll, R., Anderson, K., Schairer, C., Band, P., Goodill, A., Goldbohm, R. A., Katsouyanni, K., Hu, J., Mao, Y., Noonan, E. A., Hislop, T. G., Meirik, O., Cuadros, A., Clavel, F., Ursin, G., Boosiri, B., Lansac, J., Schofield, F., Renaud, R., Kosmelj, K., Kolonel, L. M., Hulka, B., Berry, G., Daling, J. R., Jones, L., Mati, J. G., Hulka, B. S., McCredie, M., Spears, G. F.S., Trichopoulou, A., Schuman, L., Farley, T. M.M., Ravnihar, B., Wei, H. Y., Key, T., Skegg, D. C.G., Lewis, C., Bernstein, L., Miller, A. B., Hanson, R. L., Ross, R. K., Martin, N., Rohan, T., Collins, R., Yuan, J. M., Colditz, G., Gao, Y. T., MacLennan, R., Segala, C., Weiss, N. S., Cooper Booth, J., Andrieu, N., Banks, E., Richardson, S., van Leeuwen, F. E., Newcomb, P., Gammon, M. D., Wongsrichanalai, C., Friedman, G. D., Szklo, M., Baens, J., van den Brandt, P. A., Alexander, F. E., Wilson, H. G., Spirtas, R., Tajima, K., Gerber, M., Franceschi, S., Stare, J., Ron, E., Jelihovsky, T., Mabuchi, K., Piana, L., Wall, C., Schoenberg, J. A., Koetsawang, S., Apelo, R. A., Marchbanks, P., Stewart, W., Van Leeuven, M., Jimakorn, P., Beeson, W. L., Pardthaisong, T., Tryggvadottir, L., Zheng, W., Adami, H. O., Coates, R. J., Palet, A., Wingo, P. A., Thomas, D. B., Thomas, D., Enger, S., Trichopoulos, D., Chutivongse, S., Bulbrook, R. D., Rosero-Bixby, L., Gajalakshmi, V., de la Cruz, J. R., Hopper, J. L., Muller, A., Zhiheng, C., Beral, V., Hamajima, N., Ewertz, M., Varma, A. O., Nomura, A. M.Y., Rookus, M. A., Lee, H. P., Ebeling, K., Cuzick, J., Yang, P., Cuevas, H. R., Peterson, H. B., Izquierdo, A., Brinton, L. A., Nishan, P., Clarke, E. A., Hayward, J. L., Crossley, B., Yun, T., Kalache, A., Moller, T. R., Hutchinson, W. B., Green, J., Marubini, E., Hoover, R., Wax, Y., Modan, B., Ory, H. W., Duffy, S. W., Ranstam, J., Olsson, H., Lund, E., Gairard, B., Ferraroni, M., Paganini-Hill, A., Appleby, P., Shu, X. O., Vessey, M., Haile, R. W., Dabancens, A., Folsom, A. R., Langston, N., Talamini, R., Skegg, D., Neil, A., Chang-Claude, J., Bachelot, A., McMichael, A. J., Javier, B., Persson, I., Paul, C., Mahoney, M. C., Hirose, K., Rachawat, D., De Sanjosé, S., Longnecker, M. P., Johnson, K. C., Morabia, A., Preston, D., Levi, F., Silpisornkosol, S., Stalsberg, H., McPherson, K., Yeates, D., Lê, M. G., Chantarakul, N., Clavel-Chapelon, F., Secretariat, Cancer Research UK Epidemiology Unit, Beral V, Hamajima N, Hirose K, Rohan T, Calle EE, Heath CW, Coates RJ, Liff JM, Talamini R, Chantarakul N, Koetsawang S, Rachawat D, Morabia A, Schuman L, Stewart W, Szklo M, Bain C, Schofield F, Siskind V, Band P, Coldman AJ, Gallagher RP, Hislop TG, Yang P, Kolonel LM, Nomura AMY, Hu J, Johnson KC, Mao Y, De Sanjose S, Lee N, Marchbanks P, Ory HW, Peterson HB, Wilson HG, Wingo PA, Ebeling K, Kunde D, Nishan P, Hopper JL, Colditz G, Gajalakshmi V, Martin N, Pardthaisong T, Solpisornkosol S, Theetranont C, Boosiri B, Chutivongse S, Jimakorn P, Virutamasen P, Wongsrichanalai C, Ewertz M, Adami HO, Bergkvist L, Magnusson C, Persson I, Chang-Claude J, Paul C, Skegg DCG, Spears GFS, Boyle P, Evstifeeva T, Daling JR, Hutchinson WB, Malone K, Noonan EA, Stanford JL, Thomas DB, Weiss NS, White E, Andrieu N, Bremond A, Clavel F, Gairard B, Lansac J, Piana L, Renaud R, Izquierdo A, Viladiu P, Cuevas HR, Ontiveros P, Palet A, Salazar SB, Arsitizabal N, Cuadros A, Tryggvadottir L, Tulinius H, Bachelot A, Le MG, Peto J, Franceschi S, Lubin F, Modan B, Ron E, Wax Y, Friedman GD, Hiatt RA, Levi F, Bishop T, Kosmelj K, Primic-Zakelj M, Ravnihar B, Stare J, Beeson WL, Fraser G, Bulbrook RD, Cuzick J, Duffy SW, Fentiman IS, Hayward JL, Wang DY, McMichael AJ, McPherson K, Hanson RL, Leske MC, Mahoney MC, Nasca PC, Varma AO, Weinstein AL, Moller TR, Olsson H, Ranstam J, Goldbohm RA, van den Brandt PA, Apelo RA, Baens J, de la Cruz JR, Javier B, Lacaya LB, Ngelangel CA, La Vecchia C, Negri E, Marubini E, Ferraroni M, Gerber M, Richardson S, Segala C, Gatei D, Kenya P, Kungu A, Mati JG, Brinton LA, Hoover R, Schairer C, Spirtas R, Lee HP, Rookus MA, van Leeuwen FE, Schoenberg JA, McCredie M, Gammon MD, Clarke EA, Jones L, Neil A, Vessey M, Yeates D, Appleby P, Banks E, Bull D, Crossley B, Goodill A, Green J, Hermon C, Key T, Langston N, Lewis C, Reeves G, Collins R, Doll R, Peto R, Mabuchi K, Preston D, Hannaford P, Kay C, Rosero-Bixby L, Gao YT, Jin F, Yuan JM, Wei HY, Yun T, Zhiheng C, Berry G, Cooper Booth J, Jelihovsky T, MacLennan R, Shearman R, Wang QS, Baines CJ, Miller AB, Wall C, Lund E, Stalsberg H, Shu XO, Zheng W, Katsouyanni K, Trichopoulou A, Trichopoulos D, Dabancens A, Martinez L, Molina R, Salas O, Alexander XE, Anderson K, Folsom AR, Hulka BS, Bernstein L, Enger S, Haile RW, Paganini-Hill A, Pike MC, Ross RK, Ursin G, Yu MC, Longnecker MP, Newcomb P, Kalache A, Farley TMM, Holck S, Meirik O, and Universitat de Barcelona
COLLABORATORS (in alphabetical order of institution, study name, or location) Aichi Cancer Research Institute, Nagoya, Japan: N Hamajima, K Hirose, K Tajima; Albert Einstein College of Medicine, NY, USA: T Rohan; American Cancer Society, GA, USA: EE Calle, CW Jr Heath; Atlanta, Emory University, GA, USA: RJ Coates, JM Liff; Aviano Cancer Center, Pordenone, Italy: R Talamini; Mahidol University, Bangkok, Thailand: N Chantarakul, S Koetsawang, D Rachawat; Breast Tumor Collaborative Study, Johns Hopkins University, MD, USA: A Morabia, L Schuman, W Stewart, M Szklo; University of Queensland, Brisbane, Australia: C Bain, F Schofield, V Siskind; British Columbia Cancer Agency, BC, Canada: P Band, AJ Coldman, RP Gallagher, TG Hislop, P Yang; Cancer Research Center, University of Hawaii, Hawaii, USA: LM Kolonel, AMY Nomura; Canadian Cancer Registries Epidemiology Research Group, Canada: J Hu, KC Johnson, Y Mao; Catalán Institut of Oncology, Barcelona, Spain: S De Sanjosé; Centers for Disease Control & Prevention, GA, USA: N Lee, P Marchbanks, HW Ory, HB Peterson, HG Wilson, PA Wingo; Central Institute of Cancer Research, Berlin, Germany: K Ebeling, D Kunde, P Nishan; Centre for Genetic Epidemiology, University of Melbourne, Melbourne, Australia: JL Hopper; Channing Laboratory, Brigham and Women's Hospital, Harvard Medical School, MA, USA: G Colditz for Nurses' Health Study Research Group; Chennai Cancer Institute, Madras, India: V Gajalakshmi; Chiang Mai University, Chiang Mai, Thailand: N Martin, T Pardthaisong, S Silpisornkosol, C Theetranont; Chulalongkorn University, Bangkok, Thailand: B Boosiri, S Chutivongse, P Jimakorn, P Virutamasen, C Wongsrichanalai; Danish Cancer Society, Aalborg, Denmark: M Ewertz; Department of Medical Epidemiology, Karolinska Institute, Stockholm, Sweden: HO Adami, L Bergkvist, C Magnusson, I Persson; Deutsches Krebsforschungszentrum, Heidelberg, Germany: J Chang-Claude; University of Otago, Dunedin, New Zealand: C Paul, DCG Skegg, GFS Spears; European Institute of Oncology, Milan, Italy: P Boyle, T Evstifeeva; Fred Hutchinson Cancer Research Center, WA, USA: JR Daling, WB Hutchinson, K Malone, EA Noonan, JL Stanford, DB Thomas, NS Weiss, E White; French Multicentre Breast Study, INSERM, Villejuif, France: N Andrieu, A Brêmond, F Clavel, B Gairard, J Lansac, L Piana, R Renaud; Girona Cancer Registry, Girona, Spain: A Izquierdo, P Viladiu; Hospital General de Mexico, Mexico City, Mexico: HR Cuevas, P Ontiveros, A Palet, SB Salazar; Hospital Universitario, Cali, Colombia: N Aristizabal, A Cuadros; Icelandic Cancer Society, Reykjavik, Iceland: L Tryggvadottir, H Tulinius; INSERM, Institut Gustave-Roussey, Villejuif, France: A Bachelot, MG Lê; Institute of Cancer Research, Sutton and London School of Hygiene and Tropical Medicine, UK: J Peto; International Agency for Research in Cancer, Lyon, France: S Franceschi; Israel Chaim Sheba Medical Centre, Tel-Hashomer, Israel: F Lubin, B Modan, E Ron, Y Wax; Kaiser Permanente, CA, USA: GD Friedman, RA Hiatt; Institut universitaire de medecine sociale et preventive, Lausanne, Switzerland: F Levi; Cancer Research UK Genetic Epidemiology Laboratory, Leeds, UK: T Bishop; Institute of Oncology, Ljubljana, Slovenia: K Kosmelj, M Primic-Zakelj, B Ravnihar, J Stare; Loma Linda University, CA, USA: WL Beeson, G Fraser; Cancer Research UK Department of Mathematics, Statistics & Epidemiology, London: RD Bulbrook, J Cuzick, SW Duffy, IS Fentiman, JL Hayward, DY Wang; London School of Hygiene & Tropical Medicine, London, UK: AJ McMichael, K McPherson; Long Island Breast Cancer Study, NY, USA: RL Hanson, MC Leske, MC Mahoney, PC Nasca, AO Varma, AL Weinstein; University Hospital, Lund, Sweden: TR Moller, H Olsson, J Ranstam; Maastricht University, Maastricht, The Netherlands: RA Goldbohm, PA van den Brandt; University of Philippines, Manila, Philippines: RA Apelo, J Baens, JR de la Cruz, B Javier, LB Lacaya, CA Ngelangel; Istituto ‘Mario Negri', Milan, Italy: C La Vecchia, E Negri; Istituto Nazionale Tumori, Divisione di Statistica Medica e Biometria, Milan, Italy: E Marubini; Istituto di Statistica Medica e Biometria, Milan, Italy: M Ferraroni; Montpellier Cancer Centre & INSERM, Montpellier, France: M Gerber, S Richardson, C Segala; Nairobi Centre for Research in Reproduction, Nairobi, Kenya: D Gatei, P Kenya, A Kungu, JG Mati; National Cancer Institute, MD, USA: LA Brinton, R Hoover, C Schairer; National Institute of Child Health & Human Development, MD, USA: R Spirtas; National University of Singapore, Singapore: HP Lee; The Netherlands Cancer Institute, Amsterdam, The Netherlands: MA Rookus, FE van Leeuwen for the Netherlands Oral Contraceptives and Breast Cancer Study Group; New Jersey State Department of Health, NJ, USA: JA Schoenberg; New South Wales Cancer Council, Sydney, Australia: M McCredie; Columbia University School of Public Health, NY, USA: MD Gammon; Ontario Cancer Treatment & Research Foundation, Ontario, Canada: EA Clarke; Department of Public Health & Primary Care, Oxford, UK: L Jones, A Neil, M Vessey, D Yeates; Cancer Research UK Epidemiology Unit, Oxford, UK (Secretariat): P Appleby, E Banks, V Beral, D Bull, B Crossley, A Goodill, J Green, C Hermon, T Key, N Langston, C Lewis, G Reeves; Cancer Research UK/MRC/BHF Clinical Trial Service Unit & Epidemiological Studies Unit, Oxford, UK: R Collins, R Doll, R Peto; Radiation Effects Research Foundation, Hiroshima, Japan: K Mabuchi, D Preston; Royal College of General Practitioners Oral Contraception Study, London, UK: P Hannaford, C Kay; University of Costa Rica, San Jose, Costa Rica: L Rosero-Bixby; Shanghai Cancer Institute, Shanghai, China: YT Gao, F Jin, J-M Yuan; Shanghai Institute of Planned Parenthood Research, Shanghai, China: HY Wei, T Yun, C Zhiheng; Department of Public Health, Sydney, Australia: G Berry, J Cooper Booth, T Jelihovsky, R MacLennan, R Shearman; Tianjin Cancer Institute, Tianjin, China: Q-S Wang; Department of Public Health Sciences, Toronto, Canada: CJ Baines, AB Miller, C Wall; Tromso University, Tromso, Norway: E Lund, H Stalsberg; Vanderbilt University, TN, USA: XO Shu, W Zheng; University of Athens Medical School, Athens, Greece: K Katsouyanni, A Trichopoulou, D Trichopoulos; University of Chile, Santiago, Chile: A Dabancens, L Martinez, R Molina, O Salas; University of Edinburgh, Edinburgh, UK: FE Alexander; University of Minnesota School of Public Health, MN, USA: K Anderson, AR Folsom on behalf of the Iowa Women's Health Study; University of North Carolina at Chapel Hill, School of Public Health, NC, USA: BS Hulka; University of Nottingham, Nottingham, UK: CED Chilvers; University of Southern California, LA, USA: L Bernstein, S Enger, RW Haile, A Paganini-Hill, MC Pike, RK Ross, G Ursin, MC Yu; University of Wisconsin Comprehensive Cancer Center, WI, USA: MP Longnecker, P Newcomb for the 4 State Study; Vasteras, Sweden: L Bergkvist; World Health Organisation, Geneva, Switzerland: A Kalache; World Health Organisation, UNDP/UNFPA/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction, Geneva, Switzerland: TMM Farley, S Holck, O Meirik. Analysis and writing committee: Beral V, Bull D, Doll R, Peto R, Reeves G Steering committee: Skegg D (Chairman), Colditz G, Hulka B, La Vecchia C, Magnusson C, Muller A, Peterson B, Pike M, Thomas D, Van Leeuven M.; International audience; Alcohol and tobacco consumption are closely correlated and published results on their association with breast cancer have not always allowed adequately for confounding between these exposures. Over 80% of the relevant information worldwide on alcohol and tobacco consumption and breast cancer were collated, checked and analysed centrally. Analyses included 58,515 women with invasive breast cancer and 95,067 controls from 53 studies. Relative risks of breast cancer were estimated, after stratifying by study, age, parity and, where appropriate, women's age when their first child was born and consumption of alcohol and tobacco. The average consumption of alcohol reported by controls from developed countries was 6.0 g per day, i.e. about half a unit/drink of alcohol per day, and was greater in ever-smokers than never-smokers, (8.4 g per day and 5.0 g per day, respectively). Compared with women who reported drinking no alcohol, the relative risk of breast cancer was 1.32 (1.19-1.45, P/=45 g per day alcohol. The relative risk of breast cancer increased by 7.1% (95% CI 5.5-8.7%; P