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Comparison of the therapeutic effects of [$$^{211}$$At]NaAt and [$$^{131}$$I]NaI in an NIS-expressing thyroid cancer mouse model

Watabe, Tadashi*; Liu, Y.*; Kaneda, Kazuko*; Sato, Tatsuhiko   ; Shirakami, Yoshifumi*; Oe, Kazuhiro*; Toyoshima, Atsushi*; Shimosegawa, Eku*; Wang, Y.*; Haba, Hiromitsu*; Nakano, Takashi*; Shinohara, Atsushi*; Hatazawa, Jun*

In this study, we compare the therapeutic effect between [$$^{211}$$At]NaAt and [$$^{131}$$I]NaI. In vitro analysis of double-stranded DNA break (DSB) and colony formation assay were performed using K1-NIS cells. [$$^{211}$$At]NaAt induced higher numbers of DSBs and had a reduced colony formation than [$$^{131}$$I]NaI. In K1-NIS mice, dose-dependent therapeutic effects were observed in both [$$^{211}$$At]NaAt and [$$^{131}$$I]NaI. The superior therapeutic effect of [$$^{211}$$At]NaAt suggests the promising clinical applicability of targeted alpha therapy using [$$^{211}$$At]NaAt in patients with differentiated thyroid cancer refractory to standard [$$^{131}$$I]NaI treatment.

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Category:Biochemistry & Molecular Biology

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