TY - JOUR

T1 - Hysterectomy and risk of epithelial ovarian cancer by histologic type, endometriosis, and menopausal hormone therapy

AU - Ring, Linea Landgrebe

AU - Baandrup, Louise

AU - Zheng, Guoqiao

AU - Gottschau, Mathilde

AU - Dehlendorff, Christian

AU - Mellemkjær, Lene

AU - Kjaer, Susanne K.

N1 - Funding Information: This work was supported by the Mermaid project [Mermaid 3]. The funding sources had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication. Publisher Copyright: © 2023 Elsevier Ltd

PY - 2023

Y1 - 2023

N2 - Background: This nationwide, register-based case-control study investigated the association between hysterectomy and risk of epithelial ovarian cancer according to histology and by history of endometriosis and menopausal hormone therapy (MHT) use. Methods: From the Danish Cancer Registry, all women registered with epithelial ovarian cancer at age 40–79 years during 1998–2016 were identified (n = 6738). Each case was sex- and age-matched to 15 population controls using risk-set sampling. Information on previous hysterectomy on benign indication and potential confounders was retrieved from nationwide registers. Conditional logistic regression was used to calculate odds ratios (ORs) with 95% confidence intervals (CIs) for the association between hysterectomy and ovarian cancer according to histology, endometriosis, and use of MHT. Results: Hysterectomy was not associated with risk of epithelial ovarian cancer overall (OR=0.99; 95% CI 0.91 –1.09) but was associated with reduced risk of clear cell ovarian cancer (OR=0.46; 95% CI 0.28–0.78). In stratified analyses, decreased ORs associated with hysterectomy were seen in women with endometriosis (OR=0.74; 95% CI 0.50–1.10) and in non-users of MHT (OR=0.87; 95% CI 0.76–1.01). In contrast, among long-term MHT users, hysterectomy was associated with increased odds for ovarian cancer (OR=1.20; 95% CI 1.03–1.39). Conclusion: Hysterectomy was not associated with epithelial ovarian cancer overall but with reduced risk of clear cell ovarian cancer. Our findings may suggest a reduced risk of ovarian cancer after hysterectomy in women with endometriosis and in MHT non-users. Interestingly our data pointed to an increased ovarian cancer risk associated with hysterectomy among long-term users of MHT.

AB - Background: This nationwide, register-based case-control study investigated the association between hysterectomy and risk of epithelial ovarian cancer according to histology and by history of endometriosis and menopausal hormone therapy (MHT) use. Methods: From the Danish Cancer Registry, all women registered with epithelial ovarian cancer at age 40–79 years during 1998–2016 were identified (n = 6738). Each case was sex- and age-matched to 15 population controls using risk-set sampling. Information on previous hysterectomy on benign indication and potential confounders was retrieved from nationwide registers. Conditional logistic regression was used to calculate odds ratios (ORs) with 95% confidence intervals (CIs) for the association between hysterectomy and ovarian cancer according to histology, endometriosis, and use of MHT. Results: Hysterectomy was not associated with risk of epithelial ovarian cancer overall (OR=0.99; 95% CI 0.91 –1.09) but was associated with reduced risk of clear cell ovarian cancer (OR=0.46; 95% CI 0.28–0.78). In stratified analyses, decreased ORs associated with hysterectomy were seen in women with endometriosis (OR=0.74; 95% CI 0.50–1.10) and in non-users of MHT (OR=0.87; 95% CI 0.76–1.01). In contrast, among long-term MHT users, hysterectomy was associated with increased odds for ovarian cancer (OR=1.20; 95% CI 1.03–1.39). Conclusion: Hysterectomy was not associated with epithelial ovarian cancer overall but with reduced risk of clear cell ovarian cancer. Our findings may suggest a reduced risk of ovarian cancer after hysterectomy in women with endometriosis and in MHT non-users. Interestingly our data pointed to an increased ovarian cancer risk associated with hysterectomy among long-term users of MHT.

KW - Endometrioses

KW - Hormone replacement therapy

KW - Hysterectomy

KW - Ovarian cancer

KW - Post menopausal

U2 - 10.1016/j.canep.2023.102359

DO - 10.1016/j.canep.2023.102359

M3 - Journal article

C2 - 37054550

AN - SCOPUS:85152119382

VL - 84

JO - Cancer Epidemiology

JF - Cancer Epidemiology

SN - 1877-7821

M1 - 102359

ER -