J L Wittlif

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The rate of response of human breast cancer to endocrine therapy depends upon the estrogen receptor ER levels and progesterone receptor PR levels in tumor tissue. About 55% to 60% of all breast cancers have positive estrogen receptors. Higher values of ER are observed in postmenopausal women compared to younger women, and about 45% to 55% of metastatic(More)
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