Background: The importance of Patient Engagement (PE) on clinical trial design is well established. PE in oncology medicines development can serve many purposes including obtaining input on trial design/procedures, identifying recruitment challenges and barriers to participation, and understanding retention strategies. Designing a clinical trial with procedures that have been confirmed as acceptable to participants is also likely to improve patient adherence to treatments. Triple-Negative Breast Cancer (TNBC) is a virulent subtype associated with early onset and increased risk of early recurrenceand accounts for 15% to 20% of breast cancers. In addition, a higher risk exists in premenopausal and Black women.Chemotherapy is the mainstay of curative therapy recommended by guidelines. The aim was to obtain insights from patients to inform key aspects of a clinical study design including choice of chemotherapy regimen, study feasibility and recruitment strategies. Methods: Two groups of US women (N = 20) ages 28-54; (race 55% Caucasian, 30% African American, 10% Hispanic, 5% Native American) diagnosed with Stage IIb-IV TNBC and in active or completed treatment were recruited to participate in two in person IRB approved sessions. Trained 3^rd party facilitators used qualitative methods to elicit patient feedback. Preliminary research included interviews with key stakeholders, including TNBC advocacy group leaders and a review of online patient communities. Patients reviewed a study design with an investigational agent every 3 weeks plus chemotherapy (nab-paclitaxel; paclitaxel) or placebo plus chemotherapy. Results: Patient reaction to the choice of taxane chemotherapy in the standard of care arm was neutral to negative. Approximately 50% of the patients identified taxane treatment as a barrier to participation. All patients requested flexibility in treatment choices, clear information about required tests and visits, and more diversity in recruitment materials. Black and Hispanic women impacted by TNBC did not feel they had equal access to clinical trials due to race, rural location, and other factors. Patient insights reinforced the decision to add another standard-of-care option (carboplatin plus gemcitabine) as a treatment arm to the trial design and was confirmed with investigators. Patient feedback was incorporated into the trial along with additional strategies to support recruitment of diverse patients in the clinical study. Conclusions: On November 13, 2020 the FDA approved this regimen in the label for pembrolizumab in combination with chemotherapy, as the 1^st line treatment in women with locally recurrent or metastatic TNBC. Both patients and physicians perceived that a flexible chemotherapy backbone was a benefit.