1. Highly selective inhibition of estrogen biosynthesis by CGS 20267, a new non-steroidal aromatase inhibitor;Bhatnagar;J Steroid Biochem Mol Biol,1990
2. Letrozole (CGS 20267). A phase I study of a new potent oral aromatase inhibitor of breast cancer;Lipton;Cancer,1995
3. Phase I study of the oral nonsteroidal aromatase inhibitor CGS 20267 in postmenopausal patients with advanced breast cancer;Iveson;Cancer Res,1993
4. Phase I study of the oral nonsteroidal aromatase inhibitor CGS 20267 in healthy postmenopausal women;Iveson;J Clin Endocrinol Metab,1993
5. Approval summary: letrozole in the treatment of postmenopausal women with advanced breast cancer;Cohen;Clin Cancer Res,2002