Estrogen-alone hormone therapy does not increase the risk of breast cancer in postmenopausal women, according to an updated analysis of the breast cancer findings of the Women’s Health Initiative (WHI) Estrogen-Alone Trial. The WHI is sponsored by the National Heart, Lung, and.
Estrogen-alone therapy and invasive breast cancer incidence by dose, formulation, and route of delivery: findings from the WHI observational study. Shufelt C(1).
However, the Women's Health Initiative revealed that women (with hysterectomies) who took estrogen alone did not show a significant increase in breast cancer.
In March 2004, it was concluded from the WHI study that those taking estrogen only had no increased risk of breast cancer or heart disease;.
Before the link between HRT use and breast cancer risk was established, many Estrogen-only HRT increases the risk of breast cancer, but only when used for .