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- W2743606473 abstract "Merkel cell carcinoma (MCC) is a malignant neuroendocrine skin tumor frequently associated with the Merkel cell polyomavirus. Immune checkpoint therapy showed remarkable results, although not all patients are responsive to this therapy. Anti-tropomyosin receptor kinase A (TrkA)-targeted treatment has shown promising results in several tumor entities.To determine TrkA expression in MCC as a rationale for potential targeted therapy.This case series study investigated the MCC specimens of 55 patients treated at the Department of Dermatology, University Hospital of Schleswig-Holstein, Kiel, Germany, from January 1, 2005, through December 31, 2015. Thirty-nine of the 55 samples were suitable for further histopathologic examination. Expression of TrkA was explored by immunohistochemical analysis.Diagnosis of MCC was confirmed by staining positive for cytokeratin 20 (CK20) and synaptophysin.Expression of TrkA on the tumor cells.Specimens of 39 patients (21 women and 18 men; mean [SD] age, 75.0 [7.8] years) underwent immunohistochemical investigation. Thirty-eight of 38 specimens expressed CK20 and synaptophysin on the MCC tumor cells (100% expression). Merkel cell polyomavirus was detected in 32 of 38 specimens (84%). Tropomyosin receptor kinase A was found in all 36 evaluable specimens on the tumor cells; 34 (94%) showed a weak and 2 (6%) showed a strong cytoplasmic expression. In addition, strongly positive perinuclear dots were observed in 30 of 36 specimens (83%).Tropomyosin receptor kinase A was expressed on MCC tumor cells in 100% of evaluable specimens. This result may lead to the exploration of new targeted treatment options in MCC, especially for patients who do not respond to anti-programmed cell death protein 1 treatment." @default.
- W2743606473 created "2017-08-17" @default.
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- W2743606473 date "2017-11-01" @default.
- W2743606473 modified "2023-10-16" @default.
- W2743606473 title "Tropomyosin Receptor Kinase A Expression on Merkel Cell Carcinoma Cells" @default.
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- W2743606473 doi "https://doi.org/10.1001/jamadermatol.2017.2495" @default.
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