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パルボウイルスB19感染による純粋赤血球無形成症とアテゾリズマブ:症例報告と文献レビュー

Dante Pio Pallotta^1,2, Bernardo Stefanini^1,2, Agnese Pratelli^1,2

¹Unit of Internal Medicine, Hepatobiliary and Immunoallergic Diseases, IRCCS Azienda Ospedalie-ro-Universitaria di Bologna, Bologna, Italy.

|August 21, 2025

まとめ

アテゾリズマブのような免疫チェックポイント阻害剤は重度の貧血を引き起こす可能性があります. この症例は,アテゾリズマブとパルボウイルスB19感染と関連した純粋な赤血球無形成症の患者で,ステロイドで治療に成功しました.

科学分野:

腫瘍学
免疫学
血液学

背景:

免疫チェックポイント阻害剤 (ICI) は,がん治療において有意な効果をもたらしますが,免疫関連の有害事象 (irAEs) と関連しています.
ICI誘発のIRA,特に血液学的合併症の正確なメカニズムについては,さらなる解明が必要である.
アテゾリズマブ/ ベバシズマブによる肝細胞癌 (HCC) 治療は,様々な有害事象を引き起こす可能性があります.

研究の目的:

アテゾリズマブ/ ベバシズマブで治療された高度なHCC患者の重度の貧血を報告する.
アテゾリズマブとパルボウイルスB19感染と純粋赤血球無形成症 (PRCA) の間の潜在的な関連を調査する.
この珍しい有害事象の管理と結果について説明します.

主な方法:

進行したHCCの69歳の患者の症例報告
骨髄アスピレーションの分析,赤色線評価とパルボウイルスB19 PCRを含む.
治療には,輸血,静脈内免疫グロブリン,一時的なICI中断,およびその後のコルチコステロイド療法が含まれていた.

主要な成果:

患者は重度の貧血を発症し,当初はパルボウイルスB19誘発のPRCAに起因していた.
アテゾリズマブ/ ベバシズマブの再投与で貧血が再発し,ICIに関連する病因を示唆した.
プレドニゾンの治療は,ヘモグロビン濃度の有意な改善と貧血の解消につながった.

結論:

アテゾリズマブは,パルボウイルスB19のようなウイルス感染症によって悪化する可能性があるPRCAを含む血液学的有害事象と関連付けられる.
コルチコステロイド治療は,ICIに関連するPRCAの管理に有効である.
このケースは,治療中に原因不明の貧血を発症する患者のICI毒性を考慮することの重要性を強調しています.

キーワード:

パルボウイルスB19 純粋な赤血球無形成症免疫チェックポイント阻害剤免疫関連の有害事象免疫療法

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