Er Positive Breast Cancer. Normal breast cells and some breast cancer cells have receptors that attach to the hormones estrogen and progesterone and depend on these hormones to grow. The cells of this type of breast cancer have receptors that allow them to use the hormone estrogen to grow.
However it might be possible that both studies may be contaminated by non luminal tumors especially in high risk rs group. Estrogen receptors are the most common type of hormone receptor on breast cells. About 80 of all breast cancers are er positive that means the cancer cells grow in response to the hormone estrogen.
In er positive breast cancer cancerous cells receive their growth signals from the hormone estrogen.
Retrospective analyses of nsabp b20 and swog 8814 showed a large benefit of chemotherapy in patients with er positive tumors and high oncotypedx recurrence score rs 31. The cells of this type of breast cancer have receptors that allow them to use the hormone estrogen to grow. Breast cancers that have estrogen receptors are called er positive or er cancers. Along with tumor.
