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• W1966328856 abstract "Background and purpose FaDu human squamous cell carcinoma (FaDu-hSCC) demonstrates accelerated tumor repopulation during fractionated irradiation with pathological validation (Ki-67 and BrdUrd makers) in a xenograft model system. However, these and other functional assays must be performed ex vivo and post hoc. We propose a novel, in vivo, real-time assay utilizing 18F-FLT PET. Material and methods Nude mice with FaDu-hSCC were irradiated with 12 or 18 fractions of 1.8 Gy ([Dm] = 3.0 Gy), either daily or every second day. 18F-FLT micro-PET scans were performed at different time points, FLT parameters (SUVmax, SUVmean, and T/NT) were measured. Tumor sections were stained for Ki-67 and BrdUrd, a labeling index (LI) was calculated. Imaging-pathology correlation was determined by comparing FLT parameters and immunohistochemical results. Results Measured SUVmax, SUVmean and T/NT decreased significantly after daily irradiation with 12 fractions in 12 days (P < 0.05) and 18 fractions in 18 days (P < 0.05). In contrast, these parameters increased in mice treated with 12 fractions in 24 days (P > 0.05) and 18 fractions in 36 days (P > 0.05), suggesting accelerated repopulation. Similarly, Ki-67 and BrdUrd LIs demonstrated significant decreases with daily irradiation (P < 0.05), and increases with every-second-day irradiation (P > 0.05). 18F-FLT parameters correlated strongly with proliferation markers (r2: 0.679–0.879, P < 0.001). Conclusions 18F-FLT parameters were in good agreement with Ki-67 and BrdUrd Li. These results may support a potential role for 18F-FLT PET in real-time detection of tumor repopulation during fractionated radiotherapy." @default.
• W1966328856 created "2016-06-24" @default.
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• W1966328856 date "2014-06-01" @default.
• W1966328856 modified "2023-10-18" @default.
• W1966328856 title "Histopathologic validation of 3′-deoxy-3′-18F-fluorothymidine PET for detecting tumor repopulation during fractionated radiotherapy of human FaDu squamous cell carcinoma in nude mice18F-FLT PET repopulation -->" @default.
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• W1966328856 doi "https://doi.org/10.1016/j.radonc.2014.04.002" @default.
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