Thiochroman derivative CH4986399, a new nonsteroidal estrogen receptor down-regulator, is effective in breast cancer models.

Anticancer Res 30(3):873-8 (2010) PMID 20393009

Tamoxifen, a selective estrogen receptor modulator, and fulvestrant, a selective estrogen receptor down-regulator (SERD), are now available for estrogen receptor-positive breast cancer patients. However, these patients acquire drug-resistance during the treatments. We identified a new orally active nonsteroidal SERD, CH4986399, which is structurally unrelated to fulvestrant and tamoxifen.

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