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HER2 is a tyrosine kinase receptor whose overexpression in breast cancers correlates with poor prognosis. A subset of HER2-positive tumors also expresses a series of HER2 fragments, collectively known as p95HER2. These fragments are emerging as a valuable biomarker for this subset of patients, who have a particularly poor prognosis.
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Arribas et al. (2010) studied this question.
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