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“ Tibolone and the Delta4-isomer bind and activate progesterone and androgen receptors whereas 3alpha-OH and 3beta-OH tibolone activate the estrogen receptors.”
Gynecological endocrinology : the official journal of the International Society of Gynecological Endocrinology • 2005 | View Paper
“In conclusion, tibolone inhibits SMC growth and MAPK phosphorylation via both its estrogenic and progestogenic metabolites, and these inhibitory effects involve both progesterone and ERs.”