January 12, 2015
Annals of Oncology
TAKE-HOME MESSAGE
- Investigators in this case-control study in Denmark evaluated the association between daily low-dose aspirin and the risk for developing ovarian cancer. The findings suggest that low-dose aspirin, especially continuous, long-term use, may be associated with a reduced risk for developing epithelial ovarian cancer.
- Further studies are needed to confirm the findings.
– Jarett Feldman, MD
Abstract
BACKGROUND
A comprehensive body of evidence has shown that aspirin has cancer-preventive effects, particularly against gastrointestinal cancer, but its effects on the risk of ovarian cancer are less well established. This nationwide case-control study examined the association between low-dose aspirin and the risk of ovarian cancer.
PATIENTS AND METHODS
We identified all patients in the Danish Cancer Registry aged 30–84 years old with a histologically verified first diagnosis of epithelial ovarian cancer during 2000–2011. Each patient was sex- and age-matched to 15 population controls using risk-set sampling. Prescription use, comorbidity, reproductive history and demographic characteristics data were obtained from nationwide registries. Use of low-dose (75–150 mg) aspirin was defined according to dose and duration and consistency of use. Conditional logistic regression was used to calculate odds ratios (ORs) with 95% confidence intervals (CIs) for the association between low-dose aspirin use and the risk of epithelial ovarian cancer, both overall and for specific histological types.
RESULTS
For 4,103 ovarian cancer cases and 58,706 population controls, the adjusted OR for epithelial ovarian cancer associated with ever use (≥2 prescriptions) of low-dose aspirin was 0.94 (95% CI: 0.85–1.05). ORs for epithelial ovarian cancer were lower with the use of 150 mg aspirin tablets (OR=0.82; 95% CI: 0.68–0.99) and with long-term use (≥5 years) of low-dose aspirin (OR=0.77; 95% CI: 0.55–1.08). Continuous long-term use of low-dose aspirin, defined as close consecutive prescriptions, was associated with a further reduction in OR (0.56; 95% CI: 0.32–0.97). For histological types of epithelial ovarian cancer, the strongest inverse associations with low-dose aspirin use were seen for mucinous and endometrioid tumours.
CONCLUSION
This nationwide case-control study indicates that low-dose aspirin use may be associated with reduced risk of epithelial ovarian cancer.