Relation between hysterectomy, oophorectomy and the risk of incident differentiated thyroid cancer: The E3N cohort

Agathe Guenego, Agathe Guénégo, Guenego A, Mesrine S, Sylvie Mesrine, Laureen Dartois, Dartois L, Laurence Leenhardt, Leenhardt L, Clavel-Chapelon F, Françoise Clavel-Chapelon, Françoise Clavel‐Chapelon, Marina Kvaskoff, Marie-Christine Boutron-Ruault, Marie‐Christine Boutron‐Ruault, Boutron-Ruault MC, Fabrice Bonnet
Clinical endocrinology · 2018 · vol. 90(2) , pp. 360–368 · doi:10.1111/cen.13899 · PMID:30390407 · W2899217968
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A history of hysterectomy or uterine fibroids was associated with an increased risk of differentiated thyroid cancer in women from the E3N cohort.

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Abstract

Summary Background Thyroid cancers are threefold more frequent in women than in men. A role of reproductive or hormonal factors has been suggested but with contradictory results. We investigated potential associations between history of hysterectomy, with or without oophorectomy, and history of benign gynaecological disease (uterine fibroids, endometriosis) and the incidence of differentiated thyroid cancer, in a large French prospective cohort. Methods A total of 89 340 women from the E3N cohort were followed up between 1990 and 2012. Gynaecological diseases treated by surgery were self‐reported. Thyroid cancers were validated by histological reports. Time‐dependent covariates included smoking status, BMI and history of benign thyroid disease. Cox proportional hazard models with age as timescale were used to estimate Hazard Ratios (HR) and 95% confidence intervals (CI). Results A total of 412 cases of thyroid cancer were diagnosed during follow‐up. A history of hysterectomy was associated with an increased risk of differentiated thyroid cancer (adjusted HR=2.05; 95%CI: 1.65‐2.55). The association was not altered after further adjustment for reproductive factors. Endometriosis, uterine polyps, ovarian cysts and oophorectomy without hysterectomy were not associated with the risk of thyroid cancer. A history of fibroids was also significantly related to the risk of thyroid cancer over the follow‐up period (adjusted HR=1.91; 95%CI: 1.50‐2.44) and the increased risk persisted after adjustment for history of hysterectomy. Conclusions Women who had either a history of fibroids or hysterectomy had an increased risk of differentiated thyroid cancer. These findings suggest shared biological mechanisms between fibroids and thyroid cancer, which deserve to be further dissected.

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Condition tags

endometriosis

MeSH descriptors

Hysterectomy Leiomyoma Ovariectomy Thyroid Neoplasms Adult Female Follow-Up Studies France Genital Diseases, Female Humans Hysterectomy Incidence Leiomyoma Middle Aged Risk Factors Thyroid Neoplasms

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