NCBI
... Additive antitumor effect of
aromatase inhibitor letrozole and antiestrogen fulvestrant in a postmenopausal breast cancer model. Jelovac D, Macedo L, Goloubeva OG, Handratta V, Brodie AM. ... Therapeutic strategies...
http://www.ncbi.nlm.nih.gov/pubmed/15958593/