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• W1997420036 abstract "Abstract Local polymeric delivery enhances IUdR radiosensitization of human malignant gliomas (MG). The combined low‐dose rate (LDR) (0.03 Gy/h) and fractionated high‐dose rate (HDR) treatments result in cures of experimental MGs. To enhance efficacy, we combined polymeric IUdR delivery, LDR, and HDR for treatments of both subcutaneous and intracranial MGs. In vitro: Cells (U251 MG) were trypsinized and replated in triplicate 1 day prior to LDR irradiation in media either without (control) or with 10 μM IUdR. After 72 hr, LDR irradiation cells were acutely irradiated (1.1 Gy/min) with increasing (0, 1.25, 2.5, 5.0, or 10 Gy) single doses. Implantable IUdR polymers [(poly(bis(p‐carboxyphenoxy)‐propane) (PCPP): sebaic acid (PCPP:SA), 20:80] (50% loading; 10 mg) were synthesized. In vivo: For flank vs. intracranial tumors, mice had 6 × 10 6 subcutaneous vs. 2 × 10 5 intracranial cells. For intracranial or subcutaneous MGs, mice had intratumoral blank (empty) vs. IUdR polymer treatments. One day after implantation, mice had immediate external LDR (3 cGy/h × 3 days total body irradiation) or HDR (2 Gy BID × 4 days to tumor site) or concurrent treatments. For the in vitro IUdR treatments, LDR resulted in a striking increase in cell‐killing when combined with HDR. For the in vivo LDR treatments of flank tumors, the growth delay was greater for the IUdR vs. blank polymer treatments. For the combined LDR and HDR, the IUdR treatments resulted in a dramatic decrease in tumor volumes. On day 60 the log V/V0 were −1.7 ± 0.22 for combined LDR + HDR + IUdR polymer ( P < 0.05 vs. combined LDR + HDR + blank polymer). Survival for the intracranial controls was 22.9 ± 1.2 days. For the blank polymer + LDR vs. blank polymer + LDR + HDR treatments, survival was 25.3 ± 1.7 ( P = NS) vs. 48.1 ± 3.5 days ( P < 0.05). For IUdR polymer + LDR treatment survival was 27.3 ± 2.3 days ( P = NS). The most striking improvement in survival followed the IUdR polymer + LDR + HDR treatment: 66.0 + 6.4 days ( P < 0.05 vs. blank polymer + LDR + HDR). The polymeric IUdR delivery plus combined continuous LDR and HDR treatments results in growth delay and improved survival in animals bearing the MG xenografts. This treatment may hold promise for the treatment of human MGs. © 2001 Wiley‐Liss, Inc." @default.
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• W1997420036 title "IUdR polymers for combined continuous low-dose rate and high-dose rate sensitization of experimental human malignant gliomas" @default.
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• W1997420036 doi "https://doi.org/10.1002/ijc.1005" @default.
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