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SSTR2拮抗薬DOTA-LM3のTOCおよびTATEを超えたアルファ線標的療法–製造、品質管理、およびヒトでの結果
Lukas Greifenstein1, Marcel Martin2, Sarah Stephan1
1CURANOSTICUM MVZ GmbH Wiesbaden-Frankfurt, Center for Advanced Radiomolecular Precision Oncology, 65191 Wiesbaden, Germany.
Pharmaceuticals (Basel, Switzerland)
|January 28, 2026
まとめ
アクチニウム225標識ソマトスタチン受容体サブタイプ2(SSTR2)拮抗薬[225Ac]Ac-DOTA-LM3を用いた新しい標的アルファ線療法は、神経内分泌腫瘍(NET)に有望です。このSSTR2拮抗薬は、腫瘍標的化の改善と進行性NET治療の可能性を提供します。
科学分野:
- 核医学
- 腫瘍学
- 放射性医薬品化学
背景:
- 神経内分泌腫瘍(NET)に対するペプチド受容体核医学治療(PRRT)では、ソマトスタチン受容体サブタイプ2(SSTR2)アゴニストがしばしば使用されますが、肝臓への取り込みや耐性などの課題に直面しています。
- SSTR2拮抗薬は、NETにおける腫瘍標的化の改善の可能性を示しています。
研究 の 目的:
- アクチニウム225標識SSTR2拮抗薬[225Ac]Ac-DOTA-LM3の製造および品質管理を確立すること。
- 進行性NETの標的アルファ線療法(TAT)における[225Ac]Ac-DOTA-LM3のヒトでの臨床経験および有効性を評価すること。
主な方法:
- DOTA-LM3とアクチニウム225の標識化を検証しました。
- ラジオTLCおよびラジオHPLCを用いた放射化学的純度、収率、および安定性の評価。
- 以前の177LuベースのPRRTに不応性であった転移性神経内分泌膵腫瘍患者での臨床評価。
主要な成果:
- [225Ac]Ac-DOTA-LM3の再現性の高い高い放射化学的純度(>97%)および収率(>80%)を達成しました。
- 5日間以上にわたる遊離アクチニウム225の放出は最小限であり、高いinvitro安定性を示しました。
- 患者は部分寛解を示し、臨床症状は著しく改善し、重大な毒性は認められませんでした。
結論:
- [225Ac]Ac-DOTA-LM3は、臨床的に適用可能な方法を用いて、高い純度と安定性で製造できることを示しました。
- ヒトでのデータは、進行性NETにおける[225Ac]Ac-DOTA-LM3の有望な有効性と安全性を支持しています。
- NETに対するアクチニウム225標識SSTR2拮抗薬のさらなる臨床調査が正当化されます。
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