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PD 0332991 and Anastrozole for Stage 2 or 3 Estrogen Receptor Positive and HER2 Negative Breast Cancer

Trial Status: closed to accrual

This phase II trial studies palbociclib isethionate together with anastrozole and to see how well they work in treating patients with estrogen receptor positive (ER+) and human epidermal growth factor receptor 2 negative (HER2-) stage II or III breast cancer. Palbociclib isethionate may stop tumor growth by blocking an enzyme needed for cell division and growth. Estrogen can cause the growth of breast cancer cells. Hormone therapy using anastrozole may fight breast cancer by lowering the amount of estrogen the body makes. Giving palbociclib isethionate together with anastrozole may be an effective treatment for ER+ HER2- breast cancer.