RecruitingPhase 2Drug trialA Study of Cyclophosphamide, Methotrexate, Fluorouracil (CMF) for People With Breast CancerThe purpose of this study is to find out if it is practical (feasible) to give dose-dense CMF (cyclophosphamide, methotrexate, and fluorouracil) in two standard chemotherapy regimens in people with breast cancer, age 70 and older.