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Oestrogen receptor‐alpha (ERα), encoded by the ESR1 gene located on 6q25, is a nuclear transcription factor. Since it was reported in 2007 that more than 20% of breast cancers show ESR1 gene amplification, there has been considerable controversy about its frequency and clinical significance. We set out to assess the frequency and levels of ESR1 amplification in breast cancers. In a total of 106 breast...
The determination of oestrogen receptor α (ERα) expression in breast cancers has been for many years the standard of care for guiding patient management. In 2007, Holst and colleagues published the previously unappreciated observation that the ERα gene, ESR1, was amplified in 21% of breast cancers, and that ESR1 gene amplification identified those individuals with high ERα expression in their tumours...
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