Arimidex/Tamoxifen Neo Adjuvant Study in Premenopausal Patients With Breast Cancer Under Anti Hormonal Treatment

Multi-centre, Randomised, Double-blind, Parallel-group Study to Compare Efficacy and Safety Between Anastrozole (ZD1033) and Tamoxifen in Pre- and Post-operative Administration Under Goserelin Acetate Treatment for Premenopausal Breast Cancer Patients

The purpose of this multi-centre, randomised, double-blind, parallel-group study is to compare efficacy and safety between anastrozole and tamoxifen in pre- and post-operative administration under goserelin acetate treatment for premenopausal breast cancer patients

Inclusion Criteria:

• Premenopausal, estrogen receptor positive women, aged 20 years and over, with operable and measurable breast cancer who have provided written informed consent

Exclusion Criteria:

• Medical history of chemotherapy or endocrine therapy for breast cancer, or with treatment history of radiotherapy. Unwillingness to stop taking any drug known to affect sex hormone status (including hormone replacement therapy (HRT).