Prot# 971-ONC-0028-100 / NU 02B4: Phz 2 Trial of Exemestane (Aromasin) in Locally Advanced, Hormone Receptor-Positive [Hormone-Responsive] Breast Cancer in Postmenopausal Women [Phz 2 Stdy of Exemestane for Tmnt of Pstmnpl Wmn w/Locally Advanced Hormone