Oral Contraceptives, Abortion and Breast Cancer Risk: a Case Control Study in Saudi Arabia

Background: Several studies have examined the relationship between oral contraceptive pill (OCP) use,abortions and breast cancer, with mixed results. Hormonal changes associated with OCP use and abortion mayincrease risk of breast cancer over time, but there is a lack of studies studying this association in Saudi Arabianwomen. Materials and
Methods: We thererfore conducted a case control study in 192 women (92 as cases and 100as controls), aged 30 to 65, and collected information on variables including examples related to study objectivesand those which may confound findings. The Chi square test was used to detect associations between variousfactors and risk of breast cancer.
Results: We found no evidence of interaction between history of abortion orfrequency of abortion and breast cancer risk (Chi square=0.422, p =0.420 and 1, p =0.169) respectively. Oralcontraceptives did not confer risk for breast cancer overall (OR=0.276, 95%CI 0.092-0.829, p=0.524), while longterm use of OCP was associated with increased risk of breast cancer (OR=0.297, 95%CI 0.158-0.557, p=0.001),with higher association for those who used 10 years or more of OCPs (OR=0.282, 95%CI 0.095-0.835, p=0.02).Age at first use of OCPs had no effect on breast cancer risk (p=0.452) or age at diagnosis (p=0.074).
Conclusions:Prolonged use of OC (more than 10 years) may be associated with increased risk of breast cancer in Saudi women.Larger population based studies are needed to confirm this finding in this population.