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ER-positive is one of the Receptor statuses identified in the classification of breast cancer.Receptor status was traditionally considered by reviewing each individual receptor (ER, PR, her2) in turn, but newer approaches look at these together, along with the tumor grade, to categorize breast cancer into several conceptual molecular classes [1] that have different prognoses [2] and may have ...
A breast biopsy is tested for whether the cancer cells contain estrogen or progesterone receptors. A breast cancer that is positive for estrogen receptors is usually also progesterone receptor positive. This type of cancer is called ER/PR positive, which constitutes approximately 80% of all breast cancers. [1]
Staging of breast cancer is one aspect of breast cancer classification that assists in making appropriate treatment choices, when considered along with other classification aspects such as estrogen receptor and progesterone receptor levels in the cancer tissue, the human epidermal growth factor receptor 2 status, menopausal status, and the ...
If a patient with ER+ breast cancer develops endocrine resistance, the endocrine therapy used to treat the cancer will no longer be effective. Approximately 30-50% of ER+ breast cancer patients will relapse as a result of endocrine resistance, proving it to be a predominant challenge in the treatment of ER+ breast cancer patients. [19]
The anti-ER (SP1) antibody targets the ER alpha protein (ERα) located in the nucleus of ER-positive cells. [6] The anti-ER (SP1) antibody's response is a useful indication of the progression, management, and prediction of therapy outcome of breast cancer.
This is an accepted version of this page This is the latest accepted revision, reviewed on 2 January 2025. Cancer that originates in mammary glands Medical condition Breast cancer An illustration of breast cancer Specialty Surgical Oncology Symptoms A lump in a breast, a change in breast shape, dimpling of the skin, fluid from the nipple, a newly inverted nipple, a red scaly patch of skin on ...
Classic LCIS and invasive lobular lesions are low-grade ER and PR-positive cancers, referring to the positive expression of Estrogen and Progesterone receptors on the neoplastic cells (determined via immunohistochemistry). [8] These entities are also both classically negative for HER2 (human epidermal growth factor receptor 2).
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:
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