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This phase III trial compares the addition of an immunotherapy drug (durvalumab) to usual chemotherapy versus usual chemotherapy alone in treating patients with MammaPrint Ultrahigh (MP2) stage II-III hormone receptor positive, HER2 negative breast cancer. Immunotherapy with monoclonal antibodies, such as durvalumab, may help the body's immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread. Chemotherapy drugs, such as paclitaxel, doxorubicin, and cyclophosphamide work in different ways to stop the growth of tumor cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading. There is some evidence from previous clinical trials that people who have a MammaPrint Ultrahigh Risk result may be more likely to respond to chemotherapy and immunotherapy. Adding durvalumab to usual chemotherapy may be able to prevent the cancer from returning for patients with MP2 stage II-III hormone receptor positive, HER2 negative 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 patients receiving neoadjuvant durvalumab plus chemotherapy versus chemotherapy alone.