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Menstrual and Reproductive Factors, Hormone Use, and Risk of Pancreatic Cancer: Analysis From the International
Leila Lujan-Barroso1, Wei Zhang, Sara H Olson
1From the *Unit of Nutrition and Cancer, Cancer Epidemiology Research Program, Catalan Institute of Oncology (ICO), Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain; †Department of Epidemiology, Shanghai Cancer Institute and Jiao Tong University, Shanghai, China; ‡Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY; §Epidemiology Program, University of Hawaii Cancer Center, Honolulu, HI; ∥Public Health, Women's and Children's Hospital, Adelaide, SA, Australia; ¶University of California, San Francisco, San Francisco, CA; #National Institute for Public Health and the Environment (RIVM), Bilthoven; **Department of Gastroenterology and Hepatology, University Medical Center Utrecht, Utrecht, The Netherlands; ††Department of Epidemiology and Biostatistics, School of Public Health, Imperial College London, London, UK; ‡‡Department of Social and Preventive Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia; §§Department of Cancer Epidemiology and Genetics, Masaryk Memorial Cancer Institute, Institute and MF MU, Brno, Czech Republic; ∥∥University Health Network, Department of Surgery, University of Toronto, Toronto, Canada; ¶¶Institute of Hygiene and Epidemiology, 1st Faculty of Medicine, Charles University in Prague, Prague; ##Department of Preventive Medicine, Faculty of Medicine, Palacky University, Olomouc, Czech Republic; ***National Cancer Institute, Bethesda, MD; †††Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY; ‡‡‡Department of Clinical Sciences and Community Health, Università degli Studi di Milano, Milan, Italy; §§§Department of Hygiene, Epidemiology and Medical Statistics, School of Medicine, University of Athens, Greece; ∥∥∥Department of Epidemiology, Harvard School of Public Health, Boston, MA; ¶¶¶M.D. Anderson Cancer Center, University of Texas, Houston, TX; ###Dalla Lana School of Public Health, University of Toronto, Toronto, Canada; ****Unit of Epidemiology and Biostatistics, CRO Aviano, National Cancer Institute, IRCCS, Aviano, Italy; ††††Cancer Center and Institute of Oncology, Warsaw, Poland; and ‡‡‡‡Department of Chronic Disease Epidemiology, Yale School of Public Health, New Haven, CT.
Objectives:
We aimed to evaluate the relation between menstrual and reproductive factors, exogenous hormones, and risk of pancreatic cancer (PC).
Methods:
Eleven case-control studies within the International Pancreatic Cancer Case-control Consortium took part in the present study, including in total 2838 case and 4748 control women. Pooled estimates of odds ratios (ORs) and their 95% confidence intervals (CIs) were calculated using a 2-step logistic regression model and adjusting for relevant covariates.
Results:
An inverse OR was observed in women who reported having had hysterectomy (ORyesvs.no, 0.78; 95% CI, 0.67-0.91), remaining significant in postmenopausal women and never-smoking women, adjusted for potential PC confounders. A mutually adjusted model with the joint effect for hormone replacement therapy (HRT) and hysterectomy showed significant inverse associations with PC in women who reported having had hysterectomy with HRT use (OR, 0.64; 95% CI, 0.48-0.84).
Conclusions:
Our large pooled analysis suggests that women who have had a hysterectomy may have reduced risk of PC. However, we cannot rule out that the reduced risk could be due to factors or indications for having had a hysterectomy. Further investigation of risk according to HRT use and reason for hysterectomy may be necessary.