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Objectives: Despite recent advances in adjuvant therapy for various gynecologic malignancies, the prognosis of patients presenting with stage IVB uterine serous carcinoma (USC) remains extremely poor, with a reported 5-year survival of Methods: A multicenter retrospective analysis of patients with stage IVB USC was conducted from 2000 - 2018. Inclusion criteria were patients who had undergone comprehensive surgical staging/tumor debulking; followed by adjuvant chemotherapy±external beam radiation therapy (EBRT). Optimal cytoreduction (R1) was defined as residual disease =1cm. Patients receiving neoadjuvant chemotherapy were excluded from analysis. Progression free survival (PFS) and overall survival (OS) analysis was performed using Kaplan-Meier estimates. Multivariate analysis (MVA) was performed using Cox proportional hazards model. Results: Final analysis included 68 patients. 50 (74%) patients were cytoreduced to R1 and 18 (26%) to R2. Additionally, 11 (16%) R1 patients were cytoreduced to no gross residual disease (R0). The mean age was 66 years (range 44-89) and 96% of patients were African American. The majority of patients, 56 (82%), received systemic chemotherapy alone and 12 (18%) received a combination of chemotherapy and EBRT±vaginal brachytherapy (chemoradiation). Adjuvant therapy regimens were well-balanced between R1 and R2 patients (p=0.992). There was no difference in the frequency of treatment delays between regimens (p=0.832). 96% of patients received platinum-based chemotherapy. There was no difference in the age (p=0.227), race (p=0.936), type of radiotherapy (p=0.852) or chemotherapy regimen received (p=0.996) between R1 and R2 cohorts. The median PFS for all patients was 8 months and the median OS was 13 months. Cytoreduction to R1 was associated with a median PFS of 9 months, compared to R2 with a median PFS of 4 months (p Conclusions: In stage IVB USC, the amount of residual disease follow cytoreductive surgery is an important determinant of survival. Optimal cytoreduction should be the goal at the time of primary surgery. The combination of chemoradiation was associated with superior survival compared to chemotherapy alone and should be further investigated in this patient population.