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- W2935132327 abstract "Treatment of neuroendocrine tumors with <sup>177</sup>Lu-octreotate results in prolonged survival and improved quality of life for the patient. However, the treatment is today limited by side effects on kidney and bone marrow, and complete tumor remission is rarely seen. A possible way to minimize dose-limiting toxicity and to optimize this treatment method is to use radioprotectors in conjunction with radiotherapy. A recombinant form of α<sub>1</sub>-microglobulin (rA1M) was recently shown to preserve kidney structure and function after <sup>177</sup>Lu-octreotate injection in mice and was suggested as a radioprotector in peptide receptor radionuclide therapy. The aims of this work were to investigate the influence of rA1M on the in vivo biokinetics of <sup>177</sup>Lu-octreotate, with a focus on tumor tissue, and to study the impact of rA1M on the therapeutic response in tumor tissue subjected to <sup>177</sup>Lu-octreotate treatment. <b>Methods:</b> The biodistribution of <sup>177</sup>Lu-octreotate was examined in BALB/c nude mice with GOT2 tumors 1–168 h after injection with either <sup>177</sup>Lu-octreotate or coadministration of <sup>177</sup>Lu-octreotate and rA1M. The effects of rA1M on the tumor response after <sup>177</sup>Lu-octreotate treatment were studied in BALB/c nude mice with GOT1 tumors. Three groups of mice were administered rA1M, <sup>177</sup>Lu-octreotate, or both. Another group served as untreated controls. Tumor volume was measured to follow the treatment effects. <b>Results:</b> No statistically significant difference in biodistribution of <sup>177</sup>Lu was observed between the groups receiving <sup>177</sup>Lu-octreotate or coinjection of <sup>177</sup>Lu-octreotate and rA1M. The therapy study showed a decrease in mean tumor volume during the first 2 wk for both the <sup>177</sup>Lu-octreotate group and the coadministration group, followed by tumor regrowth. No statistically significant difference between the groups was found. <b>Conclusion:</b> rA1M did not negatively impact absorbed dose to tumor or therapeutic response in combination with <sup>177</sup>Lu-octreotate and may be a promising kidney protector during <sup>177</sup>Lu-octreotate treatment of patients with neuroendocrine tumors." @default.
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- W2935132327 date "2019-03-29" @default.
- W2935132327 modified "2023-10-14" @default.
- W2935132327 title "Recombinant α<sub>1</sub>-Microglobulin Is a Potential Kidney Protector in <sup>177</sup>Lu-Octreotate Treatment of Neuroendocrine Tumors" @default.
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- W2935132327 doi "https://doi.org/10.2967/jnumed.118.225243" @default.
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