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- W4385688119 abstract "Trophoblastic antigen 2 (Trop2) is a cell surface glycoprotein expressed in multiple types of cancers, including breast cancer, non-small cell lung cancer, and gastrointestinal cancers. Trop2 expression and the use of Trop2-directed therapy such as antibody-drug conjugate (ADC) have not yet been investigated in thymic epithelial tumors (TETs).Patients with TETs treated at MedStar Georgetown University Hospital were retrospectively identified. Of the patients for whom tumor samples and normal thymus tissue were available, immunohistochemistry (IHC) membranous staining for Trop2 and PD-L1 were performed. Positivity for Trop2 required at least 10% of the tumor cells to be stained, with an intensity scored of 1+ (weak), 2+ (moderate), and 3+ (strong). Cases with CPS ≥ 5% were considered positive for PD-L1.30 TET samples from 29 patients (17 patients with thymoma and 12 patients with thymic carcinoma) were identified. One patient with thymic carcinoma had two samples from different time points. From the same set of patients, 13 samples of normal thymus tissue were available. In normal thymus tissue, eight samples (62%) showed no positivity of Trop2, while five samples (38%) showed 1 + IHC staining. In the thymoma samples, four (24%) showed 0 or 1 + IHC staining, while 13 (76%) showed 2 + or 3 + staining. Of the 13 thymic carcinoma samples, three samples (23%) showed 1 + IHC staining while seven (54%) showed 2 + staining and three (23%) showed 3 + staining. There was no statistically significant correlation found between PD-L1 expression and Trop-2 expression in thymoma or thymic carcinoma.Trop2 is readily expressed in TETS with a higher degree of expression in thymic carcinoma. The expression of Trop-2 was lower in normal thymic tissue compared with TETs. The increased expression of Trop-2 in TETs suggests that Trop2 is an attractive therapeutic target for Trop-2 directed therapy." @default.
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- W4385688119 date "2023-10-01" @default.
- W4385688119 modified "2023-09-27" @default.
- W4385688119 title "High levels of expression of Trop-2 in thymic epithelial tumors" @default.
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- W4385688119 doi "https://doi.org/10.1016/j.lungcan.2023.107324" @default.
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