This research study is testing the safety and feasibility of delivering the 4 cycles of 'dose-dense' paclitaxel without the use of Neulasta (Pegfilgrastim) as a Granulocyte Colony-stimulating Factor (G-CSF) support. The research study is for participants who have early stage breast cancer and have been recommended to receive a standard chemotherapy regimen, doxorubicin/cyclophosphamide (AC) plus Paclitaxel (T), in what is called a "dose-dense" fashion to prevent recurrences.