In this dissertation we investigated the characteristics of the cell surface receptor PD-1 and the different cytotoxic T cells subsets from breast cancer patients prior to chemotherapy treatment. The PD-1 receptor is known to play a role in the so-called tumor escape mechanism, which negatively regulates T cell activation and T cell functions protecting tumors from the immune destruction. The methods used were, among others, isolation and culture of peripheral blood mononucleated cells, and 9-color flow cytometry. It was shown that HER2+ CD8+ T lymphocytes had a significantly higher PD-1 expression in specific HER2+ T lymphocytes compared to HER2− T cells. This may be a hint why tumor-specific cells against the HER2 epitope lack the necessary competence to eliminate malignant tumor cells in women with breast cancer and may partially explain the poorer outcome of women with HER2+ tumors.
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In this dissertation we investigated the characteristics of the cell surface receptor PD-1 and the different cytotoxic T cells subsets from breast cancer patients prior to chemotherapy treatment. The PD-1 receptor is known to play a role in the so-called tumor escape mechanism, which negatively regulates T cell activation and T cell functions protecting tumors from the immune destruction. The methods used were, among others, isolation and culture of peripheral blood mononucleated cells, and 9-co...
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