BackgroundEndometrial cancer (EC) is a hormone-related carcinoma with increased morbidity among female patients of all backgrounds. The immune microenvironment of EC is uncertain.Materials and Methods102 patients were recruited in the present study. 90 postoperative specimens from the patients were analyzed by immunohistochemistry. The leukocyte landscape of endometrial cancer was mapped using high-dimensional single-cell profiling (CyTOF) for 12 patients.ResultsNK cells, MDMs, and neutrophils

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... ere enriched in adjacent normal tissue. CCR5+CD38+ PD1+Th9 cells were enriched in the invasive margin. Additionally, PD1+ESRneg T cells and Siglec1+CCR5+CD40+ESRhi macrophage were infiltrated in the tumors.Abstract P02.04 Figure 1ConclusionsImmunological landscape of EC might shed light on new immunotherapuetic approach.Disclosure InformationH. Tong: None. H. Feng: None. X. Wan: None.