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  • Title: The pattern of sterilisation.
    Journal: N Z Med J; 1981 Aug 12; 94(689):92-3. PubMed ID: 6944650.
    Abstract:
    This editorial reports on the findings of a study from the Royal College of General Practitioners (RCGP) and from the Oxford Family Planning Association on the long term risks of oral contraception (OC). Findings show that OC under age 35 is very safe; duration of contraceptive usage is not associated with greater risk, and there is no evidence that the pill causes subarachnoid hemorrhage. The RCGP study gave an overall risk of 1.19 for breast cancer in those who had used OC; total relative risk for women aged under 35 was 2.81, for those 30-34 it was 3.33. The Oxford study showed that breast cancer risk for those who had taken OC as compared to those who had never used it was 0.96, and 0.61 for women under 35. Early pregnancy apparently lessens the risk of breast cancer. A long term U.S. study showed no difference in the incidence of breast cancer in women under 45 between OC users and nonusers. For those who developed breast cancer between 46-55 there was a risk ratio of 3.2 for those who had sometimes taken the pill. Since exposure to a carcinogen may not be evidenced by the cancer till late in life, and since OCs were not used on a large scale until the mid-1960s it will take another 10-20 years before reasonable conclusions can be drawn.
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