Patient, tumor and treatment characteristics.

<p>Abbreviations: ER, estrogen receptor; HRT, hormone replacement therapy</p><p>^a Both normal breast and cancer tissue were available for gene expression analyses from 11 premenopausal and 32 postmenopausal patients.</p><p>^b These four patients were excluded from the correlation analysis with the estrogen levels.</p><p>Patient, tumor and treatment characteristics.