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A hormone-receptor-positive (HR+) tumor is a tumor which consists of cells that express receptors for certain hormones. The term most commonly refers to estrogen receptor positive tumors (i.e. tumors that contain estrogen receptor positive cells), but can also include progesterone receptor positive tumors.
Primary tumor Origin of cells Estrogen receptors Progesterone receptors ERBB2 amplification Mutated TP53 [Notes 2] Tumorigenic in mice Reference External links 600MPE: Invasive ductal carcinoma + – – [3] Cellosaurus: AMJ13: Invasive ductal carcinoma: Primary: Yes: Yes: No--[4] Cellosaurus: AU565: Adenocarcinoma – – + – [3] Cellosaurus ...
Estrogen receptors are over-expressed in around 70% of breast cancer cases, referred to as "ER-positive", and can be demonstrated in such tissues using immunohistochemistry. Two hypotheses have been proposed to explain why this causes tumorigenesis , and the available evidence suggests that both mechanisms contribute:
These treatments are now some of the most effective adjuvant treatments of breast cancer. Estrogen receptor positive (ER+) cancer cells depend on estrogen for their growth, so they can be treated with drugs to reduce either the effect of estrogen (e.g. tamoxifen) or the actual level of estrogen (e.g. aromatase inhibitors), and generally have a ...
Indeed, breast tumors can express certain hormone receptors, and use these to grow and proliferate. These hormone receptors (HR) are the estrogen receptor (ER) and the progesterone receptor (PR). Immunohistochemical analysis of a tumor sample, taken via biopsy or after surgery, is utilized to determine the presence of these receptors. To ...
Some members of this family, such as tamoxifen, are actually partial agonists, which can actually increase estrogen receptor signalling in some tissues, such as the endometrium. Tamoxifen is currently first-line treatment for nearly all pre-menopausal women with hormone receptor-positive breast cancer. [1]
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