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ブラストシストの長期保存は,インプラントと生育率に影響しますか? デンマーク全国の登録ベースの研究
Tilde Veng Eskildsen1,2, Michael Due Larsen3,4, Jens Fedder1,2,5
1Fertility Clinic, Odense University Hospital, 5000 Odense, Denmark.
Journal of clinical medicine
|February 13, 2026
まとめ
25ヶ月までの人間のブラストシストの長期の冷凍保存は,助産生殖技術 (ART) の妊娠成功率に有意な影響を与えない. 生児出生率は安定しており,長期の胚貯蔵後に生まれた赤ちゃんには有害な結果のリスクが増加していない.
科学分野:
- 生殖医学は,生殖器医学である.
- クリオバイオロジーは,
- 胚学 胚学について
背景:
- 助産生殖技術 (ART) は,単一の卵巣刺激サイクルから胚を保存することにより,生児率を改善するために冷凍保存を使用します.
- 長期の冷凍保存がヒトの芽細胞の生存能力やその後の生殖能力に与える影響について,相反するデータがあります.
研究 の 目的:
- 凍結胚移植 (FET) の後の妊娠結果に対するブラストシスト保存期間延長の影響を調査する.
- 妊娠年齢 (SGA) に対して小さい,妊娠年齢 (LGA) に対して大きい,および長期の冷凍保存に関連した先天性不形成のリスクを評価する.
主な方法:
- デンマークの全国的なコホート研究では,2012年1月から2019年3月までの12599人のFETを分析しました.
- ブラストシストの貯蔵時間は,以下の5つのグループに分類されました: ≤3ヶ月, 4-6ヶ月, 7-12ヶ月, 13-24ヶ月, ≥25ヶ月.
- 多変量分析は,生物化学的妊娠,臨床妊娠,生児出生率,新生児のアウトカムを評価するために使用され,混同因子を調整しました.
主要な成果:
- ブラストシストの貯蔵期間が≥25ヶ月までは,生化学的妊娠 (aOR 0.96,95%CI: 0.82-1.12),臨床妊娠 (aOR 0.96,95%CI: 0.82-1.13) または生児率 (aOR 0.89,95%CI: 0.75-1.06) に有意な影響を及ぼさなかった.
- SGAや先天性不発症のリスクの有意な増加は観察されなかった.
- LGAのリスクのわずかな,有意な増加は,25ヶ月以上の貯蔵グループで認められた (aOR: 1.42,95%CI: 0.84-2.42).
結論:
- ヒトのブラストシストを最大25ヶ月間冷凍保存することは,ARTにおける妊娠成功率を著しく損ねません.
- 延長された胚貯蔵は,SGAや先天性変形を含む不良新生児結末のリスクを増加させるようには見えません.
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