Abstract
Purpose. To evaluate immunological status in patients with metastatic forms of solid tumors before and at different intervals after stereotactic body radiation therapy (SBRT) of metastatic lesions. Materials and methods. A quantitative assessment and analysis of blood immunological parameters was conducted before irradiation, after 3-4 weeks and 6-8 weeks after SBRT in patients with malignant tumors with oligometastases in the liver and lungs. All peripheral blood samples were analyzed by flow cytometry. Statistical analysis was performed using Friedman and Nemenyi criteria. Results. 3-4 weeks after the end of SBRT, we observed statistically significant increase of T-lymphocytes (CD3+CD19-); T-helpers (CD3+CD4+); activated T-helpers (CD3+CD4+HLA-DR+); activated cytotoxic T-lymphocytes (CD3+CD8+HLA-DR+) and decrease of B-lymphocytes (CD3-CD19+). Subsequently, after 6-8 weeks after the end of irradiation we detected decrease of T-lymphocytes (CD3+CD19-) and continuing increase in activated T-helpers (CD3+CD4+HLA-DR+) and activated cytotoxic T-lymphocytes (CD3+CD8+HLA-DR+). Conclusion. Thus, revealed dynamics of immunological parameters indicates the induction of the T-cell link of antitumor immunity against decreasing of indicators of humoral immunity.
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