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Song M, Nelson RA, Kruper L, Mortimer J, Luo J, Jung SY, Wallace RB, Chlebowski R. Bilateral Oophorectomy and Colorectal Cancer Incidence and Mortality in the Women's Health Initiative. Cancer Epidemiol Biomarkers Prev 2023; 32:1668-1671. [PMID: 37566400 DOI: 10.1158/1055-9965.epi-23-0198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 05/18/2023] [Accepted: 08/08/2023] [Indexed: 08/12/2023] Open
Abstract
BACKGROUND The few cohort studies examining oophorectomy and colorectal cancer risk provide mixed results. Therefore, we examined this issue in Women's Health Initiative Observational Study participants. METHODS A total of 71,312 postmenopausal women were followed for 22.1 years (median). At enrollment, 55,643 (78%) had intact ovaries and 15,669 (22%) had undergone a bilateral oophorectomy. Colorectal cancers were verified by central medical record review with mortality findings enhanced by National Death Index queries. RESULTS With 1,421 incident colorectal cancers, 450 colorectal cancer-specific mortalities, after controlling for covariates, bilateral oophorectomy was not associated with colorectal cancer incidence or colorectal cancer mortality. CONCLUSIONS No significant associations between oophorectomy and colorectal cancer incidence and mortality were seen in a large cohort study with long follow-up. IMPACT As the oophorectomy and colorectal cancer question remains open, further studies of high quality, even with null findings, should be encouraged.
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Affiliation(s)
- Mihae Song
- Division of Gynecologic Oncology, Department of Surgery, City of Hope National Medical Center, Duarte, California
| | - Rebecca A Nelson
- Division of Information Sciences, City of Hope National Medical Center, Duarte, California
| | - Laura Kruper
- Department of Breast Oncology, Moffitt Cancer Center, Tampa, Florida
| | - Joanne Mortimer
- Department of Medical Oncology & Therapeutics Research, City of Hope National Medical Center, Duarte, California
| | - Juhua Luo
- Department of Epidemiology and Biostatistics, Indiana University, School of Public Health, Bloomington, Indiana
| | - Su Yon Jung
- UCLA School of Nursing, Westwood, California
| | - Robert B Wallace
- Department of Epidemiology, University of Iowa College of Public Health, Iowa City, Iowa
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Yuk JS, Yang SW, Yoon SH, Kim MH, Seo YS, Lee Y, Kim J, Yang K, Gwak G, Cho H. The increased risk of colorectal cancer in the women who underwent hysterectomy from the South Korean National Health Insurance Database. BMC Womens Health 2023; 23:519. [PMID: 37775754 PMCID: PMC10542264 DOI: 10.1186/s12905-023-02642-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 09/08/2023] [Indexed: 10/01/2023] Open
Abstract
BACKGROUND Several population-based studies and observational studies have shown that oophorectomy is associated with an increased risk of colorectal cancer (CRC), and hormone replacement therapy has been associated with a reduction in the risk of colorectal cancer. This study was carried out to investigate whether hysterectomy, which may affect the levels of female hormones, is associated with a risk of cancer of the specific gastrointestinal tract. METHODS This population-based retrospective cohort study was conducted using insurance data provided by the Health Insurance Review and Assessment Service (HIRA) from January 1, 2007, to December 31, 2020. The hysterectomy group included 40- to 59-year-old women who underwent hysterectomy with uterine leiomyoma or uterine endometriosis from January 1, 2011, to December 31, 2014. The control group included women aged 40 to 59 years who visited medical institutions for medical examination from January 1, 2011 to December 31, 2014. RESULTS The hysterectomy and non-hysterectomhy groups comprised 66,204 and 89,768 subjects, respectively. The median ages in the non-hysterectomy group and hysterectomy group were 48 (range: 43-53) and 46 (range: 44-49) years, respectively. In the unadjusted results of the analysis, all colorectal cancer (CRC) increased in the hysterectomy alone group (HR 1.222, 95% confidence interval (CI) 1.016-1.47, p = 0.033), sigmoid colon cancer increased in the hysterectomy alone group (HR 1.71, 95% CI 1.073-2.724, p = 0.024), and rectal cancer increased in the hysterectomy with adnexal surgery group (HR 1.924, 95% CI 1.073-2.724, p = 0.002). The adjusted results showed that all CRC increased in the hysterectomy alone group (HR 1.406, 95% CI 1.057-1.871, p = 0.019), colon cancer increased in the hysterectomy alone group (HR 1.523, 95% CI 1.068-2.17, p = 0.02), and rectal cancer increased in the hysterectomy with adnexal surgery group (HR 1.933, 95% CI 1.131-3.302, p = 0.016). The all-cause mortality of GI cancer increased in the hysterectomy alone group (HR 3.495, 95% CI 1.347-9.07, p = 0.001). CONCLUSIONS This study showed that the risk of all CRC increased in women who underwent hysterectomy compared with women who did not. In particular, the risk of rectal cancer was significantly higher in the women who underwent hysterectomy with adnexal surgery than in the controls. There was no association between hysterectomy and other GI cancers.
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Affiliation(s)
- Jin -Sung Yuk
- Department of Obstetrics and Gynecology, Sanggye Paik Hospital, School of Medicine, Inje University, Seoul, Republic of Korea
| | - Seung-Woo Yang
- Department of Obstetrics and Gynecology, Sanggye Paik Hospital, School of Medicine, Inje University, Seoul, Republic of Korea
| | - Sang-Hee Yoon
- Department of Obstetrics and Gynecology, Sanggye Paik Hospital, School of Medicine, Inje University, Seoul, Republic of Korea
| | - Myoung Hwan Kim
- Department of Obstetrics and Gynecology, Sanggye Paik Hospital, School of Medicine, Inje University, Seoul, Republic of Korea
| | - Yong-Soo Seo
- Department of Obstetrics and Gynecology, Sanggye Paik Hospital, School of Medicine, Inje University, Seoul, Republic of Korea
| | - Yujin Lee
- Department of Surgery, Sanggye Paik Hospital, School of Medicine, Inje University, Seoul, Republic of Korea
| | - Jungbin Kim
- Department of Surgery, Sanggye Paik Hospital, School of Medicine, Inje University, Seoul, Republic of Korea
| | - Keunho Yang
- Department of Surgery, Sanggye Paik Hospital, School of Medicine, Inje University, Seoul, Republic of Korea
| | - Geumhee Gwak
- Department of Surgery, Sanggye Paik Hospital, School of Medicine, Inje University, Seoul, Republic of Korea
| | - Hyunjin Cho
- Department of Surgery, Sanggye Paik Hospital, School of Medicine, Inje University, Seoul, Republic of Korea.
- Department of Surgery, Sanggye Paik Hospital, School of Medicine, Inje University, Dongil-Ro, Nowon-Gu, Seoul, 1342, Republic of Korea.
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3
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Lovett SM, Sandler DP, O’Brien KM. Hysterectomy, bilateral oophorectomy, and breast cancer risk in a racially diverse prospective cohort study. J Natl Cancer Inst 2023; 115:662-670. [PMID: 36806439 PMCID: PMC10248837 DOI: 10.1093/jnci/djad038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Revised: 01/26/2023] [Accepted: 02/14/2023] [Indexed: 02/22/2023] Open
Abstract
BACKGROUND Gynecologic surgery is hypothesized to reduce risk of breast cancer; however, associations may be modified by subsequent hormone use. Our objective was to examine the association between gynecologic surgery and breast cancer incidence considering the use of hormone therapy. METHODS The Sister Study is a prospective cohort of initially breast cancer-free women aged 35-74 years with a sister who had breast cancer. We used Cox proportional hazards models to estimate hazard ratios (HRs) and 95% confidence intervals (CIs) for the association between gynecologic surgery (no surgery, hysterectomy only, bilateral oophorectomy with or without hysterectomy) and incident breast cancer among 50 701 women. RESULTS History of gynecologic surgery was common, with 13.8% reporting hysterectomy only and 18.1% reporting bilateral oophorectomy with or without hysterectomy. During follow-up (median = 11.4 years), 3948 cases were diagnosed. Compared with no surgery, bilateral oophorectomy was inversely associated with breast cancer (HR = 0.91, 95% CI = 0.83 to 1.00), and hysterectomy alone was positively associated (HR = 1.12, 95% CI = 1.02 to 1.23). Compared with no surgery and no hormone therapy, bilateral oophorectomy combined with estrogen only therapy (HR = 0.83, 95% CI = 0.74 to 0.94) was inversely associated with breast cancer, while hysterectomy combined with estrogen plus progestin therapy was positively associated with breast cancer (HR = 1.25, 95% CI = 1.01 to 1.55). CONCLUSIONS We observed an inverse association between bilateral oophorectomy and breast cancer risk. The positive association between hysterectomy and breast cancer may be due to concomitant estrogen plus progestin therapy.
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Affiliation(s)
- Sharonda M Lovett
- Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA
| | - Dale P Sandler
- Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC, USA
| | - Katie M O’Brien
- Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC, USA
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Gottschau M, Rosthøj S, Settnes A, Aalborg GL, Viuff JH, Munk C, Jensen A, Kjær SK, Mellemkjær L. Long-Term Health Consequences After Ovarian Removal at Benign Hysterectomy : A Nationwide Cohort Study. Ann Intern Med 2023; 176:596-604. [PMID: 37068275 DOI: 10.7326/m22-1628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 04/19/2023] Open
Abstract
BACKGROUND More evidence is needed to substantiate current recommendations about removing ovaries during hysterectomy for benign conditions. OBJECTIVE To compare long-term outcomes in women with and without bilateral salpingo-oophorectomy (BSO) during hysterectomy for benign conditions. DESIGN Emulated target trial using data from a population-based cohort. SETTING Women in Denmark aged 20 years or older during 1977 to 2017. PARTICIPANTS 142 985 women with hysterectomy for a benign condition, 22 974 with BSO and 120 011 without. INTERVENTION Benign hysterectomy with or without BSO. MEASUREMENTS The primary outcomes were overall hospitalization for cardiovascular disease (CVD), overall cancer incidence, and all-cause mortality through December 2018. RESULTS Compared with women without BSO, women with BSO who were younger than 45 years at surgery had a higher 10-year cumulative risk for hospitalization for CVD (risk difference [RD], 1.19 percentage points [95% CI, 0.09 to 2.43 percentage points]). Women with BSO had a higher 10-year cumulative risk for cancer for ages 45 to 54 years (RD, 0.73 percentage point [CI, 0.05 to 1.38 percentage points]), 55 to 64 years (RD, 1.92 percentage points [CI, 0.69 to 3.25 percentage points]), and 65 years or older (RD, 2.54 percentage points [CI, 0.91 to 4.25 percentage points]). Women with BSO had higher 10-year mortality in all age groups, although the differences were statistically significant only for ages 45 to 54 years (RD, 0.79 percentage point [CI, 0.27 to 1.30 percentage points]). The mortality at 20 years was inconsistent with that at 10 years in women aged 65 years or older. LIMITATION Age was a proxy for menopausal status. CONCLUSION The authors find that these results support current recommendations for conserving ovaries in premenopausal women without a high risk for ovarian cancer and suggest a cautious approach in postmenopausal women. PRIMARY FUNDING SOURCE The Danish Cancer Society's Scientific Committee and the Mermaid Project.
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Affiliation(s)
- Mathilde Gottschau
- Diet, Cancer and Health, Danish Cancer Society Research Center, Copenhagen, Denmark (M.G., J.H.V., L.M.)
| | - Susanne Rosthøj
- Statistics and Data Analysis, Danish Cancer Society Research Center, Copenhagen, Denmark (S.R., G.L.A.)
| | - Annette Settnes
- Department of Obstetrics and Gynecology, North Zealand Hospital, University of Copenhagen, Hillerød, Denmark (A.S.)
| | - Gitte Lerche Aalborg
- Statistics and Data Analysis, Danish Cancer Society Research Center, Copenhagen, Denmark (S.R., G.L.A.)
| | - Jakob Hansen Viuff
- Diet, Cancer and Health, Danish Cancer Society Research Center, Copenhagen, Denmark (M.G., J.H.V., L.M.)
| | - Christian Munk
- Virus, Lifestyle and Genes, Danish Cancer Society Research Center, Copenhagen, Denmark (C.M.)
| | - Allan Jensen
- Lifestyle, Reproduction and Cancer, Danish Cancer Society Research Center, Copenhagen, Denmark (A.J.)
| | - Susanne K Kjær
- Virus, Lifestyle and Genes, Danish Cancer Society Research Center, and Department of Gynecology, Rigshospitalet University Hospital, University of Copenhagen, Copenhagen, Denmark (S.K.K.)
| | - Lene Mellemkjær
- Diet, Cancer and Health, Danish Cancer Society Research Center, Copenhagen, Denmark (M.G., J.H.V., L.M.)
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A Revised Markov Model Evaluating Oophorectomy at the Time of Hysterectomy for Benign Indication: Age 65 Years Revisited. Obstet Gynecol 2022; 139:735-744. [PMID: 35576331 PMCID: PMC9015029 DOI: 10.1097/aog.0000000000004732] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 01/04/2022] [Indexed: 01/05/2023]
Abstract
OBJECTIVE To perform an updated Markov modeling to assess the optimal age for bilateral salpingo-oophorectomy (BSO) at the time of hysterectomy for benign indication. METHODS We performed a literature review that assessed hazard ratios (HRs) for mortality by disease, age, hysterectomy with or without BSO, and estrogen therapy use. Base mortality rates were derived from national vital statistics data. A Markov model from reported HRs predicted the proportion of the population staying alive to age 80 years by 1-year and 5-year age groups at time of surgery, from age 45 to 55 years. Those younger than age 50 years were modeled as either taking postoperative estrogen or not; those 50 and older were modeled as not receiving estrogen. Computations were performed with R 3.5.1, using Bayesian integration for HR uncertainty. RESULTS Performing salpingo-oophorectomy before age 50 years for those not taking estrogen yields a lower survival proportion to age 80 years than hysterectomy alone before age 50 years (52.8% [Bayesian CI 40.7-59.7] vs 63.5% [Bayesian CI 62.2-64.9]). At or after age 50 years, there were similar proportions of those living to age 80 years with hysterectomy alone (66.4%, Bayesian CI 65.0-67.6) compared with concurrent salpingo-oophorectomy (66.9%, Bayesian CI 64.4-69.0). Importantly, those taking estrogen when salpingo-oophorectomy was performed before age 50 years had similar proportions of cardiovascular disease, stroke, and people living to age 80 years as those undergoing hysterectomy alone or those undergoing hysterectomy and salpingo-oophorectomy at age 50 years and older. CONCLUSION This updated Markov model argues for the consideration of concurrent salpingo-oophorectomy for patients who are undergoing hysterectomy at age 50 and older and suggests that initiating estrogen in those who need salpingo-oophorectomy before age 50 years mitigates increased mortality risk.
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6
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Koch T, Therming Jørgensen J, Christensen J, Duun-Henriksen AK, Priskorn L, Kildevaeld Simonsen M, Dehlendorff C, Jovanovic Andersen Z, Juul A, Bräuner EV, Hickey M. Bilateral oophorectomy and rate of colorectal cancer: A prospective cohort study. Int J Cancer 2022; 150:38-46. [PMID: 34449872 DOI: 10.1002/ijc.33776] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 08/17/2021] [Accepted: 08/18/2021] [Indexed: 11/11/2022]
Abstract
Worldwide, colorectal cancer is the second most common cancer and third cause of cancer death in women. Estrogen exposure has been inversely associated with colorectal cancer. Oophorectomy reduces circulating estrogen, but the effect on colorectal cancer remains uncertain. The aim of this study was to examine the association between unilateral and bilateral oophorectomy and subsequent risk of colorectal cancer, and whether this association varied by menopausal status at time of oophorectomy, use of hormone replacement therapy (HRT) at baseline, hysterectomy and baseline body mass index (BMI). The study included 25 698 female nurses (aged ≥45 years) participating in the Danish Nurse Cohort. Nurses were followed from baseline until date of colorectal cancer, death, emigration or end of follow-up at December 31, 2018, whichever came first. We examined the association between oophorectomy and colorectal cancer (all ages and stratified by menopausal status). The potential modifying effects of hysterectomy, HRT use at baseline and BMI were investigated. During 542 140 person-years of follow-up, 863 (3.4%) nurses were diagnosed with colorectal cancer. Bilateral oophorectomy was associated with a 79% increased colorectal cancer rate, adjusted rate ratio (aRR) (95% confidence interval [CI]): 1.79 (1.33-2.42). Effect estimates following unilateral oophorectomy also showed higher rate of colorectal cancer, although less pronounced and nonstatistically significant (aRR) (95% CI): 1.25 (0.86-1.82). Similar results were seen when stratifying by menopausal status. The association was not modified by baseline HRT use, hysterectomy or BMI. Oophorectomy was associated with increased rate of colorectal cancer, with highest rates among women with bilateral oophorectomy.
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Affiliation(s)
- Trine Koch
- Department of Growth and Reproduction, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
- The International Research and Research Training Centre in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | | | - Jane Christensen
- Statistics and Data Analysis, Danish Cancer Society, Copenhagen, Denmark
| | | | - Laerke Priskorn
- Department of Growth and Reproduction, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
- The International Research and Research Training Centre in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | | | | | - Zorana Jovanovic Andersen
- Section of Environmental Health, Department of Public Health, University of Copenhagen, Copenhagen, Denmark
- Centre for Epidemiological Research, Nykøbing F Hospital, Nykøbing F, Denmark
| | - Anders Juul
- Department of Growth and Reproduction, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
- The International Research and Research Training Centre in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Elvira V Bräuner
- Department of Growth and Reproduction, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
- The International Research and Research Training Centre in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Martha Hickey
- Department of Obstetrics and Gynaecology, University of Melbourne, Melbourne, Victoria, Australia
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7
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Wilson LF, Tuesley KM, Webb PM, Dixon-Suen SC, Stewart LM, Jordan SJ. Hysterectomy and Risk of Breast, Colorectal, Thyroid, and Kidney Cancer - an Australian Data Linkage Study. Cancer Epidemiol Biomarkers Prev 2021; 30:904-911. [PMID: 33619026 DOI: 10.1158/1055-9965.epi-20-1670] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 01/28/2021] [Accepted: 02/10/2021] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND This study aimed to investigate the associations between hysterectomy for benign indications and risk of breast, colorectal, kidney, and thyroid cancer, and to explore whether these associations are modified by removal of ovaries at the time of surgery or by age at surgery. METHODS We conducted a retrospective cohort study of the female population of Western Australia (n = 839,332) linking data from electoral, hospital, births, deaths, and cancer records. We used Cox regression to estimate HRs and 95% confidence intervals (CI) for the associations between hysterectomy and diagnosis of breast, colorectal, kidney, and thyroid cancers. RESULTS Compared with no surgery, hysterectomy without oophorectomy (hysterectomy) and hysterectomy with bilateral salpingo-oophorectomy (hysterectomy-BSO) were associated with higher risk of kidney cancer (HR, 1.32; 95% CI, 1.11-1.56 and HR, 1.29; 95% CI, 0.96-1.73, respectively). Hysterectomy, but not hysterectomy-BSO, was related to higher risk of thyroid cancer (HR, 1.38; 95% CI, 1.19-1.60). In contrast, hysterectomy (HR, 0.94; 95% CI, 0.90-0.98) and hysterectomy-BSO (HR, 0.92; 95% CI, 0.85-1.00) were associated with lower risk of breast cancer. We found no association between hysterectomy status and colorectal cancer. CONCLUSIONS The associations between hysterectomy and cancer varied by cancer type with increased risks for thyroid and kidney cancer, decreased risk for breast cancer, and no association for colorectal cancer. IMPACT As breast, colorectal, and gynecologic cancers comprise a sizeable proportion of all cancers in women, our results suggest that hysterectomy is unlikely to increase overall cancer risk; however, further research to understand the higher risk of thyroid and kidney cancer is warranted.
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Affiliation(s)
- Louise F Wilson
- Population Health Department, QIMR Berghofer Medical Research Institute, Brisbane, Australia. .,The University of Queensland, School of Public Health, Faculty of Medicine, Brisbane, Australia
| | - Karen M Tuesley
- Population Health Department, QIMR Berghofer Medical Research Institute, Brisbane, Australia.,The University of Queensland, School of Public Health, Faculty of Medicine, Brisbane, Australia
| | - Penelope M Webb
- Population Health Department, QIMR Berghofer Medical Research Institute, Brisbane, Australia.,The University of Queensland, School of Public Health, Faculty of Medicine, Brisbane, Australia
| | - Suzanne C Dixon-Suen
- Population Health Department, QIMR Berghofer Medical Research Institute, Brisbane, Australia.,Cancer Epidemiology Division, Cancer Council Victoria, Melbourne, Australia
| | - Louise M Stewart
- Health Research and Data Analytics Hub, PHRN Centre for Data Linkage, School of Public Health, Curtin University, Perth, Australia.,Institute for Health Research, University of Notre Dame, Fremantle, Australia
| | - Susan J Jordan
- Population Health Department, QIMR Berghofer Medical Research Institute, Brisbane, Australia.,The University of Queensland, School of Public Health, Faculty of Medicine, Brisbane, Australia
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8
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Huang CY, Chang WH, Huang HY, Guo CY, Chou YJ, Huang N, Lee WL, Wang PH. Subsequent Development of Epithelial Ovarian Cancer After Ovarian Surgery for Benign Ovarian Tumor: A Population-Based Cohort Study. Clin Epidemiol 2020; 12:637-649. [PMID: 32606989 PMCID: PMC7308129 DOI: 10.2147/clep.s199349] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Accepted: 05/24/2020] [Indexed: 12/21/2022] Open
Abstract
Purpose The goal of the current study is to determine the risk of subsequent development of epithelial ovarian cancer (EOC) in women after ovarian surgery for benign ovarian tumors. Patients and Methods We conducted the nationwide population-based historic cohort study using the National Health Insurance Research Database (NHIRD) of Taiwan. Eleven thousand six hundred twenty women who underwent ovarian surgery for ovarian benign diseases were analyzed. The collected data included age, types of ovarian surgery, medical history by Charlson comorbidity index (CCI), infertility (yes/no), pelvic inflammatory disease (PID) (yes/no), tubal ligation (yes/no), total/subtotal hysterectomy (TH/STH) (yes/no), and endometrioma (yes/no). We used the Kaplan-Meier method and the Log-rank test to evaluate the risk factors. Cox proportional hazard methods were used to evaluate risk factors for the subsequent development of EOC. Multivariate analysis using Cox stepwise forward regression was conducted for the covariate selected in univariate analysis. Hazard ratio (HR) and 95% confidence interval (CI) were calculated using the Wald test. Results Subsequent EOC incidence rate (IR, incidence per 10,000 person-years) of women after ovarian surgery for benign ovarian tumors was 2.98. Separating into four groups based on different age, IR of EOC was 1.57 (<30 years), 4.71 (30-39 years), 3.59 (40-49 years) and 0.94 (≥50 years), respectively. Univariate and multivariate analyses identified only high level of CCI (≥2 or more) as an independent risk factor for subsequent development of EOC in women after ovarian surgery for benign ovarian tumors (HR 59.17, 95% CI 7.50-466.80 in women with CCI level of 2 and HR 190.68, 95% CI 24.33-2494.19, in women with CCI level ≥3, respectively). Conclusion Our results, if confirmed, suggest that women with other comorbidities (CCI) should be well informed that they may have a higher risk of subsequent development of EOC when ovarian surgery is planned even though the final pathology showed a benign ovarian tumor.
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Affiliation(s)
- Chen-Yu Huang
- Department of Obstetrics and Gynecology, Taipei Veterans General Hospital, Taipei, Taiwan.,Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan
| | - Wen-Hsun Chang
- Department of Nursing, Taipei Veterans General Hospital, Taipei, Taiwan.,Institute of Hospital and Health Care Administration, National Yang-Ming University, Taipei, Taiwan
| | - Hsin-Yi Huang
- Biostatics Task Force, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Chao-Yu Guo
- Institute of Hospital and Health Care Administration, National Yang-Ming University, Taipei, Taiwan.,Institute of Public Health, National Yang-Ming University, Taipei, Taiwan
| | - Yiing-Jenq Chou
- Institute of Hospital and Health Care Administration, National Yang-Ming University, Taipei, Taiwan.,Institute of Public Health, National Yang-Ming University, Taipei, Taiwan
| | - Nicole Huang
- Institute of Hospital and Health Care Administration, National Yang-Ming University, Taipei, Taiwan.,Institute of Public Health, National Yang-Ming University, Taipei, Taiwan
| | - Wen-Ling Lee
- Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan.,Department of Medicine, Cheng-Hsin General Hospital, Taipei, Taiwan.,Department of Nursing, Oriental Institute of Technology, New Taipei City, Taiwan
| | - Peng-Hui Wang
- Department of Obstetrics and Gynecology, Taipei Veterans General Hospital, Taipei, Taiwan.,Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan.,Female Cancer Foundation, Taipei, Taiwan.,Department of Medical Research, China Medical University Hospital, Taichung, Taiwan
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9
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Ovarian removal at or after benign hysterectomy and breast cancer: a nationwide cohort study. Breast Cancer Res Treat 2020; 181:475-485. [DOI: 10.1007/s10549-020-05628-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Accepted: 04/03/2020] [Indexed: 10/24/2022]
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10
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Roberson ML, Nichols HB, Olshan AF, A Troester M, Robinson WR. Premenopausal gynecologic surgery and survival among black and white women with breast cancer. Cancer Causes Control 2019; 31:105-112. [PMID: 31828465 DOI: 10.1007/s10552-019-01255-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 11/25/2019] [Indexed: 10/25/2022]
Abstract
PURPOSE In the United States, hysterectomies and oophorectomies are frequently performed before menopause for benign conditions. The procedures are associated with reduced breast cancer-specific mortality among White women. The relationship between premenopausal gynecologic surgery and mortality in Black women with breast cancer is unknown. METHODS This investigation used incident invasive cases of breast cancer from Phases 1 and 2 of the Carolina Breast Cancer Study a population-based study that recruited Black and White women in North Carolina between 1993 and 2001. Premenopausal gynecologic surgery was operationalized in three categories: no surgery; hysterectomy with bilateral oophorectomy; hysterectomy with conservation of ≥ 1 ovary. Mortality was ascertained using the National Death Index, last updated in 2016. Multivariable-adjusted Cox Proportional Hazard Models were used to estimate the effect of premenopausal surgery on breast cancer-specific and all-cause mortality RESULTS: Hysterectomy with bilateral oophorectomy was associated with reduced breast cancer-specific mortality (HR 0.68; 95% CI 0.49, 0.96). White and Black women had a similar reduction in breast cancer-specific mortality. (HR among white: 0.66; 95% CI 0.43, 1.02), (HR among Black: 0.67; 95% CI 0.37, 1.21). CONCLUSIONS There was a similar reduction in breast cancer-specific mortality following premenopausal, pre-diagnosis hysterectomy with bilateral oophorectomy across both Black and White women.
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Affiliation(s)
- Mya L Roberson
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, McGavran-Greenberg Hall, Campus Box 7435, Chapel Hill, NC, 27599, USA
| | - Hazel B Nichols
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, McGavran-Greenberg Hall, Campus Box 7435, Chapel Hill, NC, 27599, USA.,Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Andrew F Olshan
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, McGavran-Greenberg Hall, Campus Box 7435, Chapel Hill, NC, 27599, USA.,Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Melissa A Troester
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, McGavran-Greenberg Hall, Campus Box 7435, Chapel Hill, NC, 27599, USA.,Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.,Department of Pathology and Laboratory Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Whitney R Robinson
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, McGavran-Greenberg Hall, Campus Box 7435, Chapel Hill, NC, 27599, USA. .,Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA. .,Carolina Population Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
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11
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Begg CB, Rice MS, Zabor EC, Tworoger SS. Examining the common aetiology of serous ovarian cancers and basal-like breast cancers using double primaries. Br J Cancer 2017; 116:1088-1091. [PMID: 28334730 PMCID: PMC5396122 DOI: 10.1038/bjc.2017.73] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Revised: 02/23/2017] [Accepted: 03/01/2017] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND The somatic molecular profiles of basal-like breast cancers and high-grade serous ovarian cancers share many similarities, leading to the hypothesis that they have similar aetiologies, in which case they should occur together in the same patient more often than expected. METHODS We identified 545 women with double independent primary cancers of the breast and ovary reported to the California Cancer Registry from 1999 to 2013 and examined the coincidence of subtype combinations. RESULTS For most subtype combinations the observed frequencies were similar to their expected frequencies, but in 103 observed cases vs 43.8 expected (O/E=2.35; 95% CI 1.90-2.81) a triple-negative breast tumour (typically basal-like) was matched with a serous ovarian tumour (typically high-grade). CONCLUSIONS The results provide compelling evidence that basal-like breast cancer and high-grade serous ovarian cancer share a much more similar aetiology than breast and ovarian cancers more broadly. Further research is needed to clarify the influence of germ-line BRCA1 mutations and other risk factors on these results.
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Affiliation(s)
- Colin B Begg
- Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY 10017, USA
| | - Megan S Rice
- Massachusetts General Hospital and Harvard Medical School, Boston, MA 02115, USA
| | - Emily C Zabor
- Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY 10017, USA
| | - Shelley S Tworoger
- Brigham and Women's Hospital, Harvard Medical School and Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA
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12
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Mytton J, Evison F, Chilton PJ, Lilford RJ. Removal of all ovarian tissue versus conserving ovarian tissue at time of hysterectomy in premenopausal patients with benign disease: study using routine data and data linkage. BMJ 2017; 356:j372. [PMID: 28167486 PMCID: PMC5421461 DOI: 10.1136/bmj.j372] [Citation(s) in RCA: 81] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To conduct a nationwide study of associations between removal of all ovarian tissue versus conservation of at least one ovary at the time of hysterectomy and important health outcomes (ischaemic heart disease, cancer, and all cause mortality). STUDY DESIGN AND SETTING Retrospective analysis of the English Hospital Episode Statistics database linked to national registers of deprivation indices and of deaths. PARTICIPANTS 113 679 patients aged 35-45 who had had a hysterectomy for benign conditions between April 2004 and March 2014. EXPOSURES Bilateral ovarian removal versus no removal or unilateral ovarian removal (ovarian conservation). MAIN OUTCOME MEASURES Hospital admissions for ischaemic heart disease, cancer, or attempted suicide; deaths, overall and from heart disease, cancer, or suicide. Statistical adjustments were made using Cox regression and propensity score matching for potential confounders. RESULTS A third of patients had bilateral ovarian removal. Patients in the ovarian conservation group were less likely to be admitted for ischaemic heart disease after hysterectomy than were those in the bilateral removal group (adjusted hazard ratio 0.85, 95% confidence interval 0.77 to 0.93; P=0.001). They were also less likely to have a cancer related post-hysterectomy admission (adjusted hazard ratio 0.83, 0.78 to 0.89; P<0.001). A significant difference in all cause mortality was also seen: 0.60% (456/76 581) of patients with ovarian conservation compared with 1.01% (376/37 098) of patients with bilateral removal. Again, this difference in favour of ovarian conservation was significant (adjusted hazard ratio 0.64, 0.55 to 0.73; P<0.001). Fewer deaths related specifically to heart disease (adjusted hazard ratio 0.50, 0.28 to 0.90; P=0.02) and to cancer (0.54, 0.45 to 0.65; P<0.001) occurred in the ovarian conservation group than in the bilateral removal group. No significant difference between groups was found relating to suicide (attempted or completed). The results after propensity score matching were essentially unchanged. CONCLUSION Patients who had ovarian conservation had a significantly lower hazard of all cause mortality compared with those who had bilateral ovarian removal and also had lower death rates from ischaemic heart disease and cancer. Consistent with this observation, admissions to hospital for both ischaemic heart disease and cancer were also lower in the ovarian conservation group than in the bilateral removal group. Although removal of both ovaries protects against subsequent development of ovarian cancer, premenopausal women should be advised that this benefit comes at the cost of an increased risk of cardiovascular disease and of other (more prevalent) cancers and higher overall mortality.
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Affiliation(s)
- Jemma Mytton
- University Hospitals Birmingham NHS Foundation Trust, Birmingham B15 1JD, UK
| | - Felicity Evison
- University Hospitals Birmingham NHS Foundation Trust, Birmingham B15 1JD, UK
| | - Peter J Chilton
- Warwick Business School, University of Warwick, Coventry CV4 7AL, UK
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13
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Luo G, Zhang Y, Wang L, Huang Y, Yu Q, Guo P, Li K. Risk of colorectal cancer with hysterectomy and oophorectomy: A systematic review and meta-analysis. Int J Surg 2016; 34:88-95. [PMID: 27568653 DOI: 10.1016/j.ijsu.2016.08.518] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
BACKGROUND Colorectal cancer (CRC) is the second most commonly diagnosed cancer worldwide in females. Sex hormones may play a protective effect in CRC pathogenesis. Ovarian sex steroid levels are reduced in premenopausal women after hysterectomy. Prospective studies have revealed an 80% decrease in serum oestradiol levels after bilateral oophorectomy in premenopausal women. We aimed to elucidate the relationship between hysterectomy or oophorectomy and risk of CRC. METHODS We estimated relative risk (RR) and 95% confidence intervals (95% CIs) with the meta-analysis. Cochran's Q test and Higgins I2 statistic were used to check for heterogeneity. Subgroup and sensitivity analyses were performed as were Egger's and Begg's tests and the "trim-and-fill" method for publication bias analysis. RESULTS Risk of CRC was increased 30% for women undergoing oophorectomy relative to the general population and 24% with hysterectomy relative to no surgery. The risk was increased 22% with hysterectomy with bilateral salpingoo-ophorectomy as compared with simple hysterectomy. On subgroup analysis, risk of rectal cancer was increased 28% and colon cancer 19% with hysterectomy. Europeans seem to be sensitive to the risk of CRC, with 27% increased risk after hysterectomy. The risk of CRC after oophorectomy gradually increased with age at oophorectomy. The risk was greater with bilateral oophorectomy, with 36% increased risk, than unilateral oophorectomy, with 20% increased risk. Risk was increased 66% with time since oophorectomy 1-4 years as compared with 5-9 and ≥ 10 years. CONCLUSIONS Risk of CRC was increased for women undergoing hysterectomy or oophorectomy. Women with susceptibility genes for ovarian cancer or metrocarcinoma should choose oophorectomy or hysterectomy. For women not at high risk for these cancers, oophorectomy or hysterectomy should not be recommended for increasing the subsequent risk of CRC.
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Affiliation(s)
- Ganfeng Luo
- Department of Public Health, Shantou University Medical College, No.22 Xinling Road, Shantou, Guangdong, 515041, China.
| | - Yanting Zhang
- Department of Public Health, Shantou University Medical College, No.22 Xinling Road, Shantou, Guangdong, 515041, China.
| | - Li Wang
- Department of Public Health, Shantou University Medical College, No.22 Xinling Road, Shantou, Guangdong, 515041, China.
| | - Yuanwei Huang
- Department of Public Health, Shantou University Medical College, No.22 Xinling Road, Shantou, Guangdong, 515041, China.
| | - Qiuyan Yu
- Department of Public Health, Shantou University Medical College, No.22 Xinling Road, Shantou, Guangdong, 515041, China.
| | - Pi Guo
- Department of Public Health, Shantou University Medical College, No.22 Xinling Road, Shantou, Guangdong, 515041, China.
| | - Ke Li
- Department of Public Health, Shantou University Medical College, No.22 Xinling Road, Shantou, Guangdong, 515041, China.
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14
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Robinson WR, Nichols HB, Tse CK, Olshan AF, Troester MA. Associations of Premenopausal Hysterectomy and Oophorectomy With Breast Cancer Among Black and White Women: The Carolina Breast Cancer Study, 1993-2001. Am J Epidemiol 2016; 184:388-99. [PMID: 27555487 DOI: 10.1093/aje/kwv448] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2015] [Accepted: 12/18/2015] [Indexed: 12/15/2022] Open
Abstract
Black women experience higher rates of hysterectomy than other women in the United States. Although research indicates that premenopausal hysterectomy with bilateral oophorectomy decreases the risk of breast cancer in black women, it remains unclear how hysterectomy without ovary removal affects risk, whether menopausal hormone therapy use attenuates inverse associations, and whether associations vary by cancer subtype. In the population-based, case-control Carolina Breast Cancer Study of invasive breast cancer in 1,391 black (725 cases, 666 controls) and 1,727 white (939 cases, 788 controls) women in North Carolina (1993-2001), we investigated the associations of premenopausal hysterectomy and oophorectomy with breast cancer risk. Compared with no history of premenopausal surgery, bilateral oophorectomy and hysterectomy without oophorectomy were associated with lower odds of breast cancer (for bilateral oophorectomy, multivariable-adjusted odds ratios = 0.60, 95% confidence interval: 0.47, 0.77; for hysterectomy without oophorectomy, multivariable-adjusted odds ratios = 0.68, 95% confidence interval: 0.55, 0.84). Estimates did not vary by race and were similar for hormone receptor-positive and hormone receptor-negative cancers. Use of estrogen-only menopausal hormone therapy did not attenuate the associations. Premenopausal hysterectomy, even without ovary removal, may reduce the long-term risk of hormone receptor-positive and hormone receptor-negative breast cancers. Varying rates of hysterectomy are a potentially important contributor to differences in breast cancer incidence among racial/ethnic groups.
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15
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Segelman J, Lindström L, Frisell J, Lu Y. Population-based analysis of colorectal cancer risk after oophorectomy. Br J Surg 2016; 103:908-15. [PMID: 27115862 DOI: 10.1002/bjs.10143] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Revised: 01/22/2016] [Accepted: 02/03/2016] [Indexed: 01/13/2023]
Abstract
BACKGROUND The development of colorectal cancer is influenced by hormonal factors. Oophorectomy alters endogenous levels of sex hormones, but the effect on colorectal cancer risk is unclear. The aim of this cohort study was to examine colorectal cancer risk after oophorectomy for benign indications. METHODS Women who had undergone oophorectomy between 1965 and 2011 were identified from the Swedish Patient Registry. Standard incidence ratios (SIRs) and 95 per cent confidence intervals for colorectal cancer risk were calculated compared with those in the general population. Stratification was carried out for unilateral and bilateral oophorectomy, and hysterectomy without specification of whether the ovaries were removed or not. Associations between the three oophorectomy options and colorectal cancer risk in different locations were assessed by means of hazard ratios (HRs) and 95 per cent confidence intervals calculated by Cox proportional hazards regression modelling. RESULTS Of 195 973 women who had undergone oophorectomy, 3150 (1·6 per cent) were diagnosed with colorectal cancer at a later date (median follow-up 18 years). Colorectal cancer risk was increased after oophorectomy compared with that in the general population (SIR 1·30, 95 per cent c.i. 1·26 to 1·35). The risk was lower for younger age at oophorectomy (15-39 years: SIR 1·10, 0·97 to 1·23; 40-49 years: SIR 1·26, 1·19 to 1·33; P for trend < 0·001). The risk was highest 1-4 years after oophorectomy (SIR 1·66, 1·51 to 1·81; P < 0·001). In the multivariable analysis, women who underwent bilateral oophorectomy had a higher risk of rectal cancer than those who had only unilateral oophorectomy (HR 2·28, 95 per cent c.i. 1·33 to 3·91). CONCLUSION Colorectal cancer risk is increased after oophorectomy for benign indications.
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Affiliation(s)
- J Segelman
- Department of Molecular Medicine and Surgery, Karolinska Institute, Karolinska University Hospital, Stockholm, Sweden
| | - L Lindström
- Department of Molecular Medicine and Surgery, Karolinska Institute, Karolinska University Hospital, Stockholm, Sweden
| | - J Frisell
- Department of Molecular Medicine and Surgery, Karolinska Institute, Karolinska University Hospital, Stockholm, Sweden
| | - Y Lu
- Department of Molecular Medicine and Surgery, Karolinska Institute, Karolinska University Hospital, Stockholm, Sweden.,Department of Epidemiology and Biostatistics, Imperial College London, London, UK
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16
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Schwartz AG, Ray RM, Cote ML, Abrams J, Sokol RJ, Hendrix SL, Chen C, Chlebowski RT, Hubbell FA, Kooperberg C, Manson JE, Jo O'Sullivan M, Rohan T, Stefanick ML, Wactawski-Wende J, Wakelee H, Simon MS. Hormone Use, Reproductive History, and Risk of Lung Cancer: The Women's Health Initiative Studies. J Thorac Oncol 2015; 10:1004-13. [PMID: 25852020 PMCID: PMC4627490 DOI: 10.1097/jto.0000000000000558] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
INTRODUCTION Results from the Women's Health Initiative clinical trials demonstrated no increase in the risk of lung cancer in postmenopausal women treated with hormone therapy (HT). We conducted a joint analysis of the Women's Health Initiative observational study data and clinical trials data to further explore the association between estrogen and estrogen-related reproductive factors and lung cancer risk. METHODS Reproductive history, oral contraceptive use, and postmenopausal HT were evaluated in 160,855 women with known HT exposures. Follow-up for lung cancer was through September 17, 2012; 2467 incident lung cancer cases were ascertained, with median follow-up of 14 years. RESULTS For all lung cancers, women with previous use of estrogen plus progestin of less than 5 years (hazard ratio = 0.84; 95% confidence interval = 0.71-0.99) were at reduced risk. A limited number of reproductive factors demonstrated associations with risk. There was a trend toward decreased risk with increasing age at menopause (ptrend = 0.04) and a trend toward increased risk with increasing number of live births (ptrend = 0.03). Reduced risk of non-small-cell lung cancer was associated with age 20-29 years at first live birth. Risk estimates varied with smoking history, years of HT use and previous bilateral oophorectomy. CONCLUSIONS Indirect measures of estrogen exposure to lung tissue, as used in this study, provide only weak evidence for an association between reproductive history or HT use and risk of lung cancer. More detailed mechanistic studies and evaluation of risk factors in conjunction with estrogen receptor expression in the lung should continue as a role for estrogen cannot be ruled out and may hold potential for prevention and treatment strategies.
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Affiliation(s)
- Ann G. Schwartz
- Karmanos Cancer Institute and Department of Oncology, Wayne State University, Detroit, Michigan
| | - Roberta M. Ray
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle Washington
| | - Michele L. Cote
- Karmanos Cancer Institute and Department of Oncology, Wayne State University, Detroit, Michigan
| | - Judith Abrams
- Karmanos Cancer Institute and Department of Oncology, Wayne State University, Detroit, Michigan
| | - Robert J. Sokol
- C.S. Mott Center for Human Growth and Development and Department of Obstetrics and Gynecology, Wayne State University, Detroit, Michigan
| | | | - Chu Chen
- Program in Epidemiology, Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington
| | - Rowan T. Chlebowski
- Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, California
| | - F. Allan Hubbell
- Department of Medicine, University of California, Irvine, California
| | - Charles Kooperberg
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle Washington
| | - JoAnn E. Manson
- Division of Preventive Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Mary Jo O'Sullivan
- Department of Obstetrics and Gynecology, University of Miami School of Medicine, Miami, FL
| | - Thomas Rohan
- Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, New York
| | - Marcia L. Stefanick
- Stanford Prevention Research Center, Stanford University School of Medicine, Stanford, California
| | - Jean Wactawski-Wende
- Department of Epidemiology and Environmental Health, University of Buffalo School of Public Health and Health Professions, Buffalo, NY
| | - Heather Wakelee
- Divison of Oncology, Department of Medicine, Stanford University School of Medicine, Stanford Cancer Institute, Stanford, California
| | - Michael S. Simon
- Karmanos Cancer Institute and Department of Oncology, Wayne State University, Detroit, Michigan
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