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To determine whether breast cancer cells contain hormone receptors, doctors test samples of tumor tissue that have been removed by surgery. If the tumor cells contain estrogen receptors, the cancer is called estrogen receptor positive (ER positive), estrogen sensitive, or estrogen responsive.
Estrogen Tests. Estrogen is of fundamental importance to many aspects of a woman's overall well-being, specifically with regard to reproductive and sexual health. Estrogen imbalances can cause grave side effects, not the least of which is a disrupted menstrual cycle, weight gain or loss, and violent mood swings.