Adding an Immunotherapy Drug, MEDI4736 (Durvalumab), to the Usual Chemotherapy Treatment (Paclitaxel, Cyclophosphamide, and Doxorubicin) for Stage II-III Breast Cancer

PRIMARY OBJECTIVE: I. To compare breast cancer event-free survival between participants randomized to standard of care neoadjuvant chemotherapy alone versus standard of care neoadjuvant chemotherapy concurrent with durvalumab. SECONDARY OBJECTIVES: I. To compare pathologic complete response rates (ypT0/is, ypN0) in participants randomized to standard of care chemotherapy alone versus (vs.) standard of care neoadjuvant chemotherapy concurrent with durvalumab. II. To compare residual cancer burden distribution between participants randomized to standard of care neoadjuvant chemotherapy vs. standard of care neoadjuvant chemotherapy concurrent with durvalumab. III. To compare distant relapse-free survival between participants randomized to standard of care neoadjuvant chemotherapy vs. standard of care neoadjuvant chemotherapy concurrent with durvalumab. IV. To compare overall survival between participants randomized to standard of care neoadjuvant chemotherapy vs. standard of care neoadjuvant chemotherapy concurrent with durvalumab. V. To compare the frequency and severity of toxicities between participants randomized to standard of care neoadjuvant chemotherapy vs. standard of care neoadjuvant chemotherapy concurrent with durvalumab among those who initiate the assigned treatment. PRIMARY QUALITY OF LIFE (QOL) OBJECTIVES: I. To compare the change in fatigue (Patient Reported Outcomes Measurement Information System \[PROMIS\] Fatigue) experienced by participants randomized to neoadjuvant durvalumab plus chemotherapy vs. participants randomized to chemotherapy alone at completion of active treatment (at 20 weeks from baseline). II. To compare the change in global physical health (PROMIS Global Health) experienced by participants randomized to neoadjuvant durvalumab plus chemotherapy vs participants randomized to chemotherapy alone at completion of active treatment (at 20 weeks from baseline). SECONDARY QOL OBJECTIVES: I. To compare the change in fatigue and global physical health experienced by participants randomized to neoadjuvant durvalumab plus chemotherapy vs participants randomized to chemotherapy alone during treatment (at 12 weeks from baseline). II. To compare the changes in global physical health and fatigue subsequent to treatment (at years 1 and 2) between the two randomized study arms. III. To compare the changes in global mental health (PROMIS Global Health) during active treatment (weeks 12, 20) and subsequent to treatment (at years 1 and 2) between the two randomized study arms. IV. To compare the severity and frequency of treatment-related symptoms using Patient-Reported Outcomes Common Terminology Criteria for Adverse Events (PRO-CTCAE) items (diarrhea, nausea, cough, shortness of breath, rash, and musculoskeletal pain) over time experienced by participants receiving neoadjuvant durvalumab plus chemotherapy versus chemotherapy alone. BANKING OBJECTIVE: I. To bank specimens for future correlative studies. OUTLINE: STEP 1: Patients without a known MP2 score undergo MammaPrint testing on a previously-collected tissue sample. Patients with MP2 score proceed to STEP 2. STEP 2: Patients are randomized to 1 of 2 arms. ARM 1: Patients receive paclitaxel intravenously (IV) on days 1 and 8 of each cycle. Treatment repeats every 14 days for 6 cycles in the absence of disease progression or unacceptable toxicity. Patients then receive doxorubicin IV and cyclophosphamide IV on day 1 of each cycle. Treatment repeats every 14 days for 4 cycles in the absence of disease progression or unacceptable toxicity. ARM 2: Patients receive paclitaxel IV on days 1 and 8 of each cycle and durvalumab IV over 60 minutes on day 1 of cycles 1, 3, and 5. Treatment repeats every 14 days for 6 cycles in the absence of disease progression or unacceptable toxicity. Patients then receive doxorubicin IV and cyclophosphamide IV on day 1 of each cycle, and durvalumab IV over 60 minutes on day 1 of cycles 7 and 9. Treatment repeats every 14 days for 4 cycles in the absence of disease progression or unacceptable toxicity. All patients also undergo mammography during screening (STEP 1). Patients have the option to also undergo collection of tumor tissue during initial biopsy (STEP 1) and at standard of care (SOC) surgery and undergo collection of blood samples throughout the study. After completion of study treatment, patients are followed until death or 10 years, whichever occurs first.