estrogen receptor status

Estrogen receptor status refers to whether breast cancer cells have receptors for the hormone estrogen. If the cancer has these receptors (estrogen receptor-positive or ER-positive), it can grow in response to estrogen. If it lacks them (ER-negative), estrogen doesn't influence its growth. Knowing this helps doctors decide on treatment options, as ER-positive cancers often respond well to hormone therapies that block estrogen's effects, while ER-negative cancers may require different treatments. This status is important because it guides personalized treatment plans and provides insight into the cancer’s behavior.