The present disclosure describes a study of estrogenic activity present in various 
plant species, selectively inducing some but not all estrogenic responses in the 
uterus. Prepubertal female rats were treated sequentially with various extracts or decoctions of different 
plant species or its vehicle, followed 1 h later by treatment with estradiol-17β (E) or its 
solvent. Uteri were excised under 
anesthesia and histologically processed for 
eosinophil quantification and morphometric evaluation of various uterine responses to 
estrogen, at 6 or 24 h after 
hormone or vehicle treatment. Besides extracts or decoctions, pure 
phytoestrogens were also used. Additionally, human mammary 
cancer cells MCF-7 or MDAMB-231 were cultured in presence of the extract (or decoction), E, both or 
solvent and 
cell proliferation was evaluated. Various extracts or decoction displayed selective estrogenic and / or antiestrogenic action for some but not all parameters of 
estrogen stimulation in the 
uterus and inhibited growth of human 
mammary cells in culture or antagonized the 
estrogen-induced increase in their growth. Present results reveal, for the first time, a dissociation of responses to estrogen by 
phytoestrogens, suggesting its possible therapeutic application as 
estrogenic compounds not inducing 
cell proliferation and reveal the anticancerous effect of some of the extracts with possible therapeutic relevance. The dissociation of responses to estrogen additionally suggest therapeutic applications in estrogen-related diseases (for instance, premenstrual syndrome, 
endometriosis, etc.); the inhibition of 
eosinophil degranulation suggest an application in diseases related to eosinophils (hypereosinophilic syndrome, allergic and 
hypersensitivity diseases).