Fulvestrant With or Without AZD6244 in Treating Patients With Advanced Breast Cancer That Progressed After Aromatase Inhibitor Therapy

RATIONALE: Estrogen can cause the growth of breast cancer cells. Hormone therapy using fulvestrant may fight breast cancer by blocking the use of estrogen by the tumor cells. AZD6244 may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. It is not yet known whether fulvestrant is more effective with or without AZD6244 in treating patients with advanced breast cancer. PURPOSE: This randomized phase II trial is studying how well fulvestrant works with or without AZD6244 in treating patients with advanced breast cancer that progressed after aromatase inhibitor therapy.