ቅድመ-ቅፅ በፊርሞልማ ሴቶች ውስጥ ኤስትሮጅን-ተቀባይ ሴቲቭ ፖዚቲቭ ካንሰርን ለመያዝ ጥቅም ላይ የዋለው የመጀመሪያው የተመረጠው I, steroidal aromatase inhibitor ነበር.
Formestane oiwder anali woyamba kusankha mtundu, mtundu wa I, steroidal aromatase inhibitor ogwiritsidwa ntchito pochiza khansa ya m'mawere yotchedwa estrogen-receptor m'mayi am'mbuyo a amayi.