[177Lu]Lu-PSMA-617以降のPSMA PET/CT派生指標と成果:米国拡張アクセスプログラムからのマルチセンター遡及分析
Koichiro Kimura1, Vishnu Murthy2, Andrew F Voter3
1Department of Nuclear Medicine and Theranostics, Ahmanson Translational Theranostics Division, David Geffen School of Medicine at UCLA, Los Angeles, California; koichirokimura@mednet.ucla.edu.
まとめ
ベースラインのPSMA PET/CTの総腫瘍SUV平均は,Lu-PSMA療法を受けている転移性カストレーション耐性前立腺がん患者の治療成功の強力な予測指標です. より高いSUV平均値は,より良質な無進行および全生存率と相関し,患者の選択に役立ちます.
科学分野:
- 核医学は,核医学である.
- 腫瘍学 腫瘍学
- 放射性薬剤 放射性薬剤 放射性薬剤 放射性薬剤
背景:
- 前立腺特異性膜抗原 (PSMA) PET/CT指標は,転移性カストレーション耐性前立腺がん (mCRPC) の177Lu-PSMA治療に対する反応を予測するために調査されています.
- これらの指標を米国のExpanded-Access Programコホートで評価することは,現実世界のアプリケーションにとって極めて重要です.
研究 の 目的:
- 治療前の視覚的および定量的PSMA PET/CT指標の予後性能を評価し,比較する.
- これらの指標がPSA50,PSA進行なし生存率 (PFS),および177Lu-PSMAで治療されたmCRPC患者の全生存率 (OS) のようなアウトカムを予測するかどうかを判断する.
主な方法:
- 拡張アクセスプログラムで米国の3つの施設から88人のmCRPC患者を遡及的に分析した.
- 評価された視覚 (例えば,腫瘍と唾液腺の比) と定量的指標 (例えば,総腫瘍SUV平均,総病変吸収量).
- 単変数/多変数モデルとコンコンダンスインデックスを用いて,PSA50,PSA PFS,OSとの関連を分析した.
主要な成果:
- フォローアップ期間の中央値は36.1ヶ月,PSA50率は43%で,PSA PFSの中央値は4.5ヶ月,OSの中央値は12.5ヶ月でした.
- 全体腫瘍SUV平均は,PSA50 (AUC,0.81) の予測精度が最も高いことを示しました.
- 腫瘍全体のSUV平均値が高くなったことは,多変量分析でPSA PFS (HR,0.58) とOS (HR,0.54) の改善を独立して予測し,臨床変数のみを上回った.
結論:
- PSMA PET/CTのベースライン総腫瘍SUV平均は,臨床的要因を超えた独立した予後値を提供します.
- 全腫瘍SUV平均は,177Lu-PSMA療法による患者の選択と個別化された治療のためのバイオマーカーとして機能することができます.
- このメトリックは,mCRPC患者の治療戦略を最適化するのに役立ちます.
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