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Nature Genetics 40, 821–822 (1 July 2008) | doi:10.1038/ng0708-821

Conflicting evidence on the frequency of ESR1 amplification in breast cancer

Donna G Albertson

Solid tumors may acquire gains and losses of copies of genomic regions encompassing oncogenes and tumor suppressors. Amplification, defined as a relatively high increase in copy number of a restricted region, may also occur.