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• W2022147359 abstract "Local hyperthermia (HT) may enhance the efficacy of radioimmunotherapy (RIT). However, the optimal timing of HT relative to administration of antibody is unknown. Human colon cancer xenografts (290 +/- 26 mm3) were treated with 4.63 MBq 131I-A7 monoclonal antibody (MAb) anti-Mr 45,000 glycoprotein antigen on colorectal cancer, and HT at 43 degrees C for 1 h was administered at: (A), 2 days after the 131I-A7 injection at the maximum 131I-A7 tumor accumulation (radiation); (B), soon after the 131I-A7 injection aiming to increase the tumor accumulation of 131I-A7 due to HT vascular effects; or (C), 2 days before the 131I-A7 injection in an attempt at injecting 131I-A7 when increased antigen expression could be expected. Specific growth delay (SGD) of tumors was calculated as (Tqtreat-Tqcontrol)/Tqcontrol where Tq was tumor quadrupling time. The biodistribution and intratumoral distribution of 131I-A7 were investigated to explore the mechanism of tumor response among the different HT regimens. HT alone produced some antitumor effect (SGD 1.90 +/- 0.26), which was less effective than RIT (3.11 +/- 0.50). HT soon after 131I-A7 RIT (B) significantly enhanced RIT efficacy (6.57 +/- 0.51, p < 0.0001) whereas neither HT at 2 days after RIT (A) nor at 2 days before RIT (C) did so. Biodistribution study revealed that HT soon after RIT (B) increased the tumor radiation absorbed dose by a factor of 2.4, while HT after RIT (A) did not increase radiation dose and HT before RIT (C) decreased it. Radioluminograms of tumor sections indicated that HT soon after RIT (B) improved the uniformity of 131I-A7 distribution whereas HT after RIT (A) did not and HT before RIT (C) diminished the uniformity of A7 distribution. In conclusion, the best therapeutic efficacy was obtained when HT was combined soon after the initiation of RIT with 131I-A7. The increased tumor radiation absorbed dose and the uniform intratumoral distribution of 131I-A7 were important factors underlying this improvement, and the additive cytotoxicity of HT is suspected to some extent. HT-induced radiosensitization of tumor was not apparent in this model when HT was given 2 days after 131I-A7 MAb." @default.
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• W2022147359 date "2000-08-01" @default.
• W2022147359 modified "2023-10-18" @default.
• W2022147359 title "Optimal Timing of Administration of Hyperthermia in Combined Radioimmunotherapy" @default.
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• W2022147359 doi "https://doi.org/10.1089/cbr.2000.15.373" @default.
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