Breast cancer is said to be the second most common cancer in women after skin cancer. As of January 2021, there were over 3.8 million women with a history of breast cancer in the U.S., according to BreastCancer.org. Estrogen receptor-positive (ER-positive) breast cancer accounts for 78% of the breast cancers.
if a cancer has receptors for estrogen, it is called estrogen-receptor-positive. This suggests that cancer cells, like normal breast cells, may be stimulated to grow by estrogen-related signals. Studies have indicated that the 5-year survival rate for women with ER-positive breast cancer is better than for those with ER-negative breast cancer patients.
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