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The World Health Organization (WHO) does not recommend the use of combined oral contraceptive pills in women with breast cancer. [41] [97] Since combined oral contraceptive pills contain both estrogen and progestin, they are not recommended to be used in those with hormonally-sensitive cancers, including some types of breast cancer.
Between 2015 and 2017, 64.9% of women ages 15–49 in the United States were using contraception, and of those 12.6% were using the oral contraceptive pill. [46] There are approximately 100 million users of combined oral contraceptives worldwide, with use being more common in Western Europe, Northern Europe, and the United States. [47]
Long-term studies of users of DMPA have found slight or no increased overall risk of breast cancer. However, the study population did show a slightly increased risk of breast cancer in recent users (DMPA use in the last four years) under age 35, similar to that seen with the use of combined oral contraceptive pills. [73
[48] [51] [49] About 5 to 10% of women experience negative mood changes with combined birth control pills, and about 5% of women discontinue birth control pills due to such changes. [ 52 ] [ 48 ] A study of about 4,000 women found that progestogen-only birth control with depot medroxyprogesterone acetate had an incidence of depression of 1.5% ...
Progesterone was studied in the treatment of breast cancer in 1951 and 1952, but with relatively modest results. [158] [159] [160] Megestrol acetate was first studied in the treatment of breast cancer in 1967, and was one of the first progestins to be evaluated for the treatment of this disease. [6] [30] [161] A second study was conducted in 1974.
Ethinylestradiol (EE) is an estrogen medication which is used widely in birth control pills in combination with progestins. [7] [8] In the past, EE was widely used for various indications such as the treatment of menopausal symptoms, gynecological disorders, and certain hormone-sensitive cancers.
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