Most ER-positive breast cancers. Breast cancers that have estrogen receptors are called ER-positive or ER cancers.
If you have ER-positive breast cancer your cancer cells grow in the presence of the hormone estrogen.
Estrogen positive breast cancer. Breast cancers with progesterone receptors are called. Breast tumors that contain estrogen andor progesterone receptors are sometimes called hormone receptor positive HR positive. Estrogen occurs naturally in the body.
Breast cancer cells with higher than normal levels of HER2 are called HER2-positive. HER2 is a growth-promoting protein on the outside of all breast cells.