BACKGROUND: An association between endometriosis and certain autoimmune diseases has been suggested. However, the impact of endometriosis on risk of inflammatory bowel disease (IBD) remains unknown. OBJECTIVE: To assess the risk of Crohn's disease (CD) and ulcerative colitis (UC) in an unselected nationwide Danish cohort of women with endometriosis. DESIGN: By use of national registers, 37 661 women hospitalised with endometriosis during 1977-2007 were identified. The relative risk of developing IBD after an endometriosis diagnosis was calculated as observed versus expected numbers and presented as standardised incidence ratios (SIRs) with 95% CIs. RESULTS: Women with endometriosis had a increased risk of IBD overall (SIR=1.5; 95% CI 1.4 to 1.7) and of UC (SIR=1.5; 95% CI 1.3 to 1.7) and CD (SIR=1.6; 95% CI 1.3 to 2.0) separately, even 20 years after a diagnosis of endometriosis (UC: SIR=1.5; 95% CI 1.1 to 2.1; CD: SIR=1.8; 95% CI 1.1 to 3.2). Restricting analyses to women with surgically verified endometriosis suggested even stronger associations (UC: SIR=1.8; 95% CI 1.4 to 2.3; CD: SIR=1.7; 95% CI 1.2 to 2.5). CONCLUSION: The risk of IBD in women with endometriosis was increased even in the long term, hence suggesting a genuine association between the diseases, which may either reflect common immunological features or an impact of endometriosis treatment with oral contraceptives on risk of IBD.
BACKGROUND: An association between endometriosis and certain autoimmune diseases has been suggested. However, the impact of endometriosis on risk of inflammatory bowel disease (IBD) remains unknown. OBJECTIVE: To assess the risk of Crohn's disease (CD) and ulcerative colitis (UC) in an unselected nationwide Danish cohort of women with endometriosis. DESIGN: By use of national registers, 37 661 women hospitalised with endometriosis during 1977-2007 were identified. The relative risk of developing IBD after an endometriosis diagnosis was calculated as observed versus expected numbers and presented as standardised incidence ratios (SIRs) with 95% CIs. RESULTS:Women with endometriosis had a increased risk of IBD overall (SIR=1.5; 95% CI 1.4 to 1.7) and of UC (SIR=1.5; 95% CI 1.3 to 1.7) and CD (SIR=1.6; 95% CI 1.3 to 2.0) separately, even 20 years after a diagnosis of endometriosis (UC: SIR=1.5; 95% CI 1.1 to 2.1; CD: SIR=1.8; 95% CI 1.1 to 3.2). Restricting analyses to women with surgically verified endometriosis suggested even stronger associations (UC: SIR=1.8; 95% CI 1.4 to 2.3; CD: SIR=1.7; 95% CI 1.2 to 2.5). CONCLUSION: The risk of IBD in women with endometriosis was increased even in the long term, hence suggesting a genuine association between the diseases, which may either reflect common immunological features or an impact of endometriosis treatment with oral contraceptives on risk of IBD.
Authors: Hamed Khalili; Leslie M Higuchi; Ashwin N Ananthakrishnan; James M Richter; Diane Feskanich; Charles S Fuchs; Andrew T Chan Journal: Gut Date: 2012-05-22 Impact factor: 23.059
Authors: Marina Kvaskoff; Fan Mu; Kathryn L Terry; Holly R Harris; Elizabeth M Poole; Leslie Farland; Stacey A Missmer Journal: Hum Reprod Update Date: 2015-03-11 Impact factor: 15.610
Authors: Michael D Kappelman; Dora K Farkas; Millie D Long; Rune Erichsen; Robert S Sandler; Henrik T Sørensen; John A Baron Journal: Clin Gastroenterol Hepatol Date: 2013-04-17 Impact factor: 11.382