Dinaciclib and Epirubicin Hydrochloride in Treating Patients With Metastatic Triple-Negative Breast Cancer

This phase I clinical trial studies the side effects and the best dose of dinaciclib when given together with epirubicin hydrochloride (epirubicin) in patients with metastatic (cancer that has spread to other parts of the body) triple-negative breast cancer. Dinaciclib is designed to stop cancer cells from dividing into new cancer cells. Epirubicin is designed to block the way cancer cells grow and divide and may slow or stop cancer cells from spreading throughout the body. Researchers want to find out what is the highest tolerable dose of the experimental drug dinaciclib that can be given in combination with epirubicin in patients with metastatic triple negative breast cancer.