Clinical Outcomes After Letrozole Treatment According to the Estrogen Receptor Expression in Postmenopausal Women

Inclusion Criteria

• •1. Patients with estrogen receptor(+) and/or progesterone receptor(+)
• •2. Postmenopausal state was defined the following conditions, at least one of a, b
• •1. Serum FSH ≥ 30 mIU/mL and Amenorrhea ≥ 1 year for below 55 years, over than 55 years
• •2. Bilateral oophorectomy
• •3. Patients have undergone surgery of the breast cancer within 12 weeks and terminated chemotherapy after surgery within 4 weeks.
• •4. WHO(ECOG) performance status 0-2
• •5. Adequate haematological function, renal function, hepatic function.
• •6. No evidence of metastasis.