前立腺がんに対するクライオセラピー後のサルベージ放射線療法
F León1,2, S Moreno-López3, J Mases1
1Department of Radiation Oncology, Hospital Clínic of Barcelona, Barcelona, Spain.
まとめ
前立腺がんに対するクライオセラピー後のサルベージ放射線療法は、持続的な制御を提供する。低分画照射は、この研究では毒性の増加が観察されず、安全かつ効果的であるように思われる。
科学分野:
- 腫瘍学;放射線腫瘍学;泌尿器科学
背景:
- クライオセラピー(CT)は、前立腺がん(PC)の新たな一次治療法である。CTの使用に関するガイドラインの推奨は限られている。サルベージ放射線療法(sRT)は、CT後のPC再発の選択肢である。
研究 の 目的:
- 再発性前立腺がん(PC)に対するクライオセラピー(CT)後のサルベージ放射線療法(sRT)の毒性、局所制御、生化学的制御、および生存転帰を評価する。低分画照射が毒性および転帰に及ぼす影響を評価する。
主な方法:
- CT後にsRTで治療された再発性PC患者21例(2013-2023年)の後ろ向き分析。毒性はRTOGスケールを用いて評価。分画に関連する毒性はカイ二乗検定で比較。生化学的再発はフェニックス基準で定義。生存および局所制御はカプランマイヤー法を用いて分析。
主要な成果:
- 追跡期間中央値:56ヶ月。年齢中央値:73歳。サルベージ放射線療法(sRT)の線量中央値:73.14 Gy。86%がホルモン療法を受けた。52%が低分画照射を受けた。急性期の下部尿路(GU)毒性(G2):23.8%。晩期GU毒性(G2/G3):28.6%/9.5%。消化管(GI)毒性:5%未満。従来の低分画照射と低分画照射の間で毒性に有意差はなかった。全生存期間(OS)中央値:108.45ヶ月。OS平均値:98ヶ月。局所制御率:90.4%。
結論:
- CT後のsRTは、選択された前立腺がん患者において、持続的な局所および生化学的制御を達成できる。重度の晩期毒性の可能性はあるが、少数の症例で発生した。低分画照射は、CT後のsRTの実行可能な選択肢であり、このコホートでは毒性の増加と関連はなかった。
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