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- W4286295802 abstract "e20623 Background: Thymomas are rare neoplasms in the anterior mediastinum that account for less than 1% of tumors. The presence of immune cells within the tumor is one of the cardinal features of thymomas. However, the nature of the immune infiltration is not well characterized. Methods: Deconvolution of the gene expression of thymomas in the TCGA-THYM cohort was performed using the CIBERSORT and xCELL programs. Pairwise correlative analyses were performed to study the relationships of cell types and thymoma histological subtypes. Results: The differences in presence of immune cells was better highlighted using xCELL, which identifies 67 categories of cells rather than in the 23 categories identified by CIBERSORT. As expected, there were dramatic differences in the presence of T-cells (almost all subtypes) and B-cells between A/AB and type B (-1, -2, -3) thymomas. A significant difference (P < 0.0001) in different type B thymomas was observed for the presence of monocytes, macrophages, and M1, but not in M2 macrophages. Significant differences in dendritic cells were observed within subtypes of B thymoma. Similarly, statistically significant differences were observed between most subtypes in Immunoscore (except AB/B3) and MicroenvironmentScore (except A/B3; AB/B2 and AB/B3). However, StromalScore differences were observed only in comparisons of type A/AB with B type thymomas (except AB/B3). Interestingly, there also differences in postulated pre-adipocytes, hepatocytes, mesangial cells and osteoblasts in types A vs B, and melanocytes between subtypes of B thymomas. Conclusions: The differences in lymphoid content of the tumor microenvironment is associated with dramatic changes in cell type distribution in subtypes of thymoma. These differences in composition underpin their clinicopathological behavior including incidence of myasthenia and likelihood of recurrence." @default.
- W4286295802 created "2022-07-21" @default.
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- W4286295802 date "2022-06-01" @default.
- W4286295802 modified "2023-10-16" @default.
- W4286295802 title "Deconvolution of gene expression for microenvironmental cell types in thymomas." @default.
- W4286295802 doi "https://doi.org/10.1200/jco.2022.40.16_suppl.e20623" @default.
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