Douching, talc use, and risk for ovarian cancer and conditions related to genital tract inflammation
Menée aux Etats-Unis à partir de données portant sur 2 040 patientes atteintes d'un cancer de l'ovaire et sur 2 100 témoins, cette étude analyse l'association entre des douches vaginales, une utilisation de talc sur la zone génitale, des maladies liées à une inflammation de l'appareil génital, et le risque de développer un cancer de l'ovaire
Background : Douching is associated with disorders involving genital tract inflammation and genital talc use with epithelial ovarian cancer (EOC) but their joint effects infrequently considered. Methods : From 2040 cases of EOC and 2100 controls enrolled in Eastern Massachusetts and New Hampshire, we used unconditional logistic regression to estimate risk for EOC associated with douching and/or talc use. In subsets of cases and controls, we had also collected information about pelvic inflammatory disease (PID), ectopic pregnancy, and cervical neoplasia to estimate risk for these events from douching and/or talc use. Results :The adjusted odds ratio (OR) and 95% confidence interval (CI) for all EOC was 0.94(0.76,1.16) in women who douched but never used talc and 1.28(1.09,1.51) in women who used talc but never douched. Compared to women who never regularly douched or used talc, ORs (and 95% CIs) were 0.83(0.52, 1.33) for women who both used talc and homemade douches and 1.53(1.11, 2.10) for women who both used talc and store-bought douches. Cases who both douched and used talc were more likely to have had PID compared to cases who had used neither, OR = 5.03 (1.61, 15.7). Conclusions : Douching is not an independent risk factor for ovarian cancer but the combination of talc use and store-bought douches may modestly increase the risk for EOC beyond that for talc use alone. Impact The joint effect of talc use and douching, especially with commercial products, should be considered in evaluating risks associated with disorders involving genital tract inflammation or EOC.