tailieunhanh - Báo cáo khoa học: "Biological in-vivo measurement of dose distribution in patients’ lymphocytes by gamma-H2AX immunofluorescence staining: 3D conformal- vs. step-and-shoot IMRT of the prostate gland"

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: Biological in-vivo measurement of dose distribution in patients’ lymphocytes by gamma-H2AX immunofluorescence staining: 3D conformal- vs. step-and-shoot IMRT of the prostate gland. | Zwicker et al. Radiation Oncology 2011 6 62 http content 6 1 62 RADIATION ONCOLOGY RESEARCH Open Access Biological in-vivo measurement of dose distribution in patients lymphocytes by gamma-H2AX immunofluorescence staining 3D conformal- vs. step-and-shoot IMRT of the prostate gland 1 1 1 1 Felix Zwicker Benedict Swartman Florian Sterzing Gerald Major Klaus-Josef Weber Peter E Huber Christian Thieke1 2 Jurgen Debus1 and Klaus Herfarth1 Abstract Background Different radiation-techniques in treating local staged prostate cancer differ in their dosedistribution. Physical phantom measurements indicate that for 3D less healthy tissue is exposed to a relatively higher dose compared to SSIMRT. The purpose is to substantiate a dose distribution in lymphocytes in-vivo and to discuss the possibility of comparing it to the physical model of total body dose distribution. Methods For each technique 3D and SSIMRT blood was taken from 20 patients before and 10 min after their first fraction of radiotherapy. The isolated leukocytes were fixed 2 hours after radiation. DNA double-strand breaks DSB in lymphocytes nuclei were stained immunocytochemically using the gamma-H2AX protein. Gamma-H2AX foci inside each nucleus were counted in 300 irradiated as well as 50 non-irradiated lymphocytes per patient. In addition lymphocytes of 5 volunteer subjects were irradiated externally at different doses and processed under same conditions as the patients lymphocytes in order to generate a calibration-line. This calibration-line assigns dose-value to mean number of gamma-H2AX foci nucleus. So the dose distributions in patients lymphocytes were determined regarding to the gamma-H2AX foci distribution. With this information a cumulative doselymphocyte-histogram DLH was generated. Visualized distribution of gamma-H2AX foci correspondingly dose per nucleus was compared to the technical dose-volume-histogram DVH related to the whole body-volume. Results Measured in-vivo DLH

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