Background: Uterine serous carcinoma (USC) is an aggressive subtype of endometrial cancer with poor prognosis and limited treatment options. Immune-oncology (IO) agents have shown promise USC, however data is limited regarding which patients benefit most from IO therapy. In other malignancies, PD-L1, MSI-H status and high TMB have been predictive of IO response. We sought to characterize the immune profiles of USC and investigate treatment response to IO therapy.
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