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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.
Estrogens are hormones. Estrogens are a steroid (that is, made from cholesterol) that occurs in both men and women, and they affect the growth and development of sex organs and other tissues related to reproduction (Guyton, p.1023).eno-estrogens (foreign, unnatural estrogens) maintain estrogen-like effects at up to double the normal values for the entire adult life of some human females. As the sister hormone that's supposed to balance the whole delicate system, progesterone is often simply overwhelmed by the dominant estrogens.