PROJECT SUMMARY Twenty percent of US women with breast cancer also have diabetes mellitus (DM) and face a 50% higher risk of death up to 10 years after cancer diagnosis compared to non-diabetic women with breast cancer. A possible explanation is that DM receives less attention during cancer treatments because patients, oncologists, and primary care providers (PCPs) prioritize cancer care over DM management. Oncologists may focus on cancer care (rather than DM management), patients may not see their PCPs in the period after cancer diagnosis, and PCPs may not feel comfortable managing DM in the context of chemotherapy regimens that frequently affect glucose control. Given these concerns, identifying a provider who could effectively manage DM may be an attractive solution. Nurse practitioners (NPs) have been successfully integrated into many oncology care teams to support general cancer care. Separately, NPs have been shown to successfully manage DM in various non- cancer settings. However, no study has determined whether a NP on the oncology care team can effectively manage DM during chemotherapy for breast cancer. I hypothesize that a NP trained in DM care and embedded in the oncology team can effectively manage DM during this acute phase of breast cancer care. The objective of this study is to engage stakeholders to develop and implement a NP-led intervention to manage DM for women receiving chemotherapy for incident non-metastatic breast cancer. To accomplish this, I propose the following research aims: 1) elicit the perspectives of patients, NPs, oncologists, and PCPs about barriers to and facilitators for a NP managing DM during chemotherapy, 2) develop a NP-led intervention to manage DM during chemotherapy, and 3) conduct a pilot study to implement the intervention and assess implementation outcomes (reach, acceptability, appropriateness, feasibility, fidelity). Findings from this pilot study will lay the groundwork for a multi-site, randomized trial testing the effectiveness of this NP-led model. As a PhD-trained health services researcher focused on cancer outcomes and health disparities, I have gained quantitative research expertise. I now seek to expand my research skills to include implementation trials. To accomplish this goal, I will pursue mentorship and training in qualitative research methods, healthcare delivery, and in stakeholder-engaged intervention design, implementation, and evaluation in real-world settings. I will be mentored by two nationally-recognized clinician scientists, Dr. Monika Safford and Dr. Lisa Kern. Together, we designed a career development plan for me to gain skills through coursework and reading that is then solidified through experiential learning by carrying out my research aims. This Award will enable me to advance toward my long-term goal of becoming an independent health services researcher working at the intersection of cancer care, primary care, and health equity to improve patient outcomes and reduce...