Overview ATAC - Arimidex, Tamoxifen Alone or in Combination Status: Completed Trial end date: 2010-04-01 Target enrollment: Participant gender: Summary The aim of this study is to test whether Arimidex alone or in combination with Tamoxifen is beneficial in the treatment of breast cancer. Phase: Phase 3 Details Lead Sponsor: AstraZenecaTreatments: AnastrozoleTamoxifen