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- W2051848610 abstract "The most important therapeutic tool in brain metastasis is radiation therapy. However, resistance to radiation is a possible cause of recurrence or treatment failure. Recently, DNA damage checkpoint signaling pathway activation after irradiation has received increasing attention. The association between the expression levels and survival outcome was evaluated to find possible therapeutic targets in brain metastasis. Radiosensitivity of human non-small cell lung cancer cell lines was determined by checking their viability after treatment with varying doses of ionizing radiation (IR). The expression of DNA checkpoint proteins was analyzed by Western blots and immunohistochemistry. On the basis of the clinical data for the patients, the association between the expression of the components and patients' survival was investigated. The expression levels of TopBP1 and phosphorylated Chk1 (P-Chk1) protein were higher in radioresistant lung cancer cell lines compared to radiosensitive cell lines. We previously assessed radiation survival of lung cancer cell lines after treating them with Chk1 inhibitor, AZD7762. AZD7762 significantly sensitized both radioresistant and radiosensitive cells to IR. We also observed a strong inverse relationship between progression-free survival (PFS) and expression level of P-Chk1 and TopBP1. This study, which is the first clinical report that connects DNA damage checkpoints and prognosis of brain metastasis, supports these two proteins to be promising targets for overcoming the radioresistance in brain metastasis." @default.
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- W2051848610 date "2011-08-01" @default.
- W2051848610 modified "2023-09-22" @default.
- W2051848610 title "The Expression of DNA Damage Checkpoint Proteins and Prognostic Implication in Metastatic Brain Tumors" @default.
- W2051848610 doi "https://doi.org/10.3727/096504011x13123323849654" @default.
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