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The main approach in overcoming endocrine resistance in those breast cancers that are both ER+ and HER2+ is by using a combination of endocrine and HER2-targeting agents. [22] In trials conducted with a combination of anti-HER2 agents and an aromatase inhibitor, significant clinical benefit and improved progression-free survival have been observed.
HER2 proteins have been shown to form clusters in cell membranes that may play a role in tumorigenesis. [26] [27] Evidence has also implicated HER2 signaling in resistance to the EGFR-targeted cancer drug cetuximab. [28] The high expression of HER2 correlates with better survival in esophageal adenocarcinoma. [29]
Giredestrant is an investigational oral selective estrogen receptor degrader (SERD) being developed for the treatment of estrogen receptor-positive (ER+) breast cancer. [1] [2] It is a potent, nonsteroidal compound that antagonizes estrogen effects by competitively binding to both wild-type and mutant estrogen receptors with nanomolar potency.
HER2-low has some HER2 proteins on the cell surface, but not enough to be classified as HER2-positive. [4] Trastuzumab deruxtecan is the first approved therapy by the US Food and Drug Administration (FDA) targeted to people with the HER2-low breast cancer subtype. [4] DNA-based classification.
Triple-negative breast cancer (TNBC) is any breast cancer that either lacks or shows low levels of estrogen receptor (ER), progesterone receptor (PR) and human epidermal growth factor receptor 2 (HER2) overexpression and/or gene amplification (i.e. the tumor is negative on all three tests giving the name triple-negative). [1]
US Postal Service employees work inside the Los Angeles Mail Processing & Distribution Center on December 3. The facility is currently processing 1 million packages per day.
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