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The conclusions for progesterone were the same in a 2019 meta-analysis of the worldwide epidemiological evidence by the Collaborative Group on Hormonal Factors in Breast Cancer (CGHFBC). [131] Most data on breast density changes and breast cancer risk are with oral progesterone. [126] Data on breast safety with vaginal progesterone are scarce ...
The increase in breast cancer risk with estrogen and progestogen therapy was shown to be causal with conjugated estrogens plus medroxyprogesterone acetate in the Women's Health Initiative randomized controlled trials. [122] [155] Breast cancer risk with combined estrogen and progestogen therapy may differ depending on the progestogen used.
Importantly, hormonal contraception is only associated with diagnosis of breast cancer and not an increased risk of mortality from breast cancer.” “All contraceptive methods have risks and ...
A systematic review in 2010 did not support an increased overall cancer risk in users of combined oral contraceptive pills, but did find a slight increase in breast cancer risk among current users, which disappears 5–10 years after use has stopped; the study also found an increased risk of cervical and liver cancers. [123]
As more young people are diagnosed with breast cancer, they worry about returning stage 4, metastatic breast cancer. Experts share emerging research, what's known.
They concluded that: "Overall, there was no evidence of an increased risk of breast cancer". [53] Recent anxieties about the contribution of progestogens to the increased risk of breast cancer associated with HRT in postmenopausal women such as found in the WHI trials [54] have not spread to progestogen-only contraceptive use in premenopausal ...
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