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The American Cancer Society also stated that "natural" and "bioidentical" hormones present the same risks as synthetic hormone replacement therapy such as heart disease, blood clots, strokes and an increased risk of breast cancer with long-term use. [52]
Natural pregnancy before the age of 20 has been associated with a 50% lifetime reduction in the risk of breast cancer. [56] Pseudopregnancy has been found to produce decreases in risk of mammary gland tumors in rodents similar to those of natural pregnancy, implicating high levels of estrogen and progesterone in this effect.
Moreover, breast cancer risk is heightened following use of the combined oral contraceptive pill and combined hormone replacement therapy. [4] Armed with this evidence that endogenous and exogenous changes in estrogen and progesterone levels modulate the risk of breast cancer, it is apparent that hormones can play a key role in breast cancer.
[151] [153] In addition to breast cancer risk, estrogen alone and estrogen plus progestogen therapy are associated with higher breast cancer mortality. [154] With 20 years of use, breast cancer incidence is about 1.5-fold higher with estrogen alone and about 2.5-fold higher with estrogen plus progestogen therapy relative to non-use. [151]
Breast cancer patients choosing alternative medicine were 5.68 times more likely to die within five years of diagnosis. [10] Although they are more likely to die than non-users, some users of alternative treatments feel a greater sense of control over their destinies and report less anxiety and depression. [24]
2-Methoxyestradiol (2-ME2, 2-MeO-E2) is a natural metabolite of estradiol and 2-hydroxyestradiol (2-OHE2). It is specifically the 2-methyl ether of 2-hydroxyestradiol. 2-Methoxyestradiol prevents the formation of new blood vessels that tumors need in order to grow (angiogenesis), hence it is an angiogenesis inhibitor. [1]
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