- Exemestane is superior to megestrol acetate after tamoxifen failure in postmenopausal women with advanced breast cancer: results of a phase III randomized double-blind trial. The Exemestane Study Group. Kaufmann, M., Bajetta, E., Dirix, L.Y., Fein, L.E., Jones, S.E., Zilembo, N., Dugardyn, J.L., Nasurdi, C., Mennel, R.G., Cervek, J., Fowst, C., Polli, A., di Salle, E., Arkhipov, A., Piscitelli, G., Miller, L.L., Massimini, G. J. Clin. Oncol. (2000)