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進行性多巣性白質脳症におけるウイルス特異的T細胞とチェックポイント阻害剤への反応

Nora Möhn^1,2, Lea Grote-Levi¹, Agnes Bonifacius³

¹Department of Neurology, Hannover Medical School, Hannover, Germany.

|January 20, 2026

Insights

進行性多巣性白質脳症（PML）患者における既存のウイルス特異的T細胞は、免疫チェックポイント阻害剤（ICI）による治療を受けた場合の転帰の改善と相関する。これは、PMLにおける効果的なICI療法の鍵となるのは抗ウイルス免疫であることを示唆している。

科学分野:

免疫学
神経学
腫瘍学

背景:

進行性多巣性白質脳症（PML）は、免疫不全患者におけるJCウイルス（JCV）再活性化によって引き起こされる重度の脱髄疾患である。
免疫チェックポイント阻害剤（ICI）はPMLの治療可能性を提供するが、治療反応は様々であり、予測バイオマーカーが必要とされている。

研究の目的:

PML患者におけるICI治療の効果と、治療前のJCウイルス（JCV）および/またはBKウイルス特異的T細胞との関連を調査すること。
PMLにおける治療反応および転帰を予測するための潜在的なバイオマーカーを特定すること。

主な方法:

ICI（ペムブロリズマブ、ニボルマブ、またはアテゾリズマブ）で治療された111人のPML患者を含む後ろ向きコホート研究。
治療前の末梢血ウイルス特異的T細胞（ELISpot/フローサイトメトリーで検出）の有無に基づいて患者を層別化した。
T細胞陽性、T細胞陰性、およびT細胞状態不明の群間で、臨床転帰、ウイルス量、および免疫関連有害事象を比較した。

主要な成果:

ICI療法前の検出可能なウイルス特異的T細胞を有する患者は、T細胞陰性患者（23％）と比較して有意に高い奏効率（86％ vs. P < .001）を示した。
T細胞陽性患者は、T細胞陰性患者と比較して、生存期間（P = .002）および機能的転帰（修正ランキン尺度スコア、P = .009）が良好であった。
T細胞陽性患者では、脳脊髄液中のJCウイルス量が低く（P = .01）、免疫関連有害事象が少なかった（P = .02）。

結論:

既存の機能的なウイルス特異的T細胞は、ICI療法を受けているPML患者における臨床反応の向上、生存期間の延長、および毒性の軽減と関連している。
治療前の抗ウイルス免疫の存在は、PMLにおけるICI療法の成功にとって重要な要因である可能性がある。
これらの発見は、PMLにおけるICI治療の予測バイオマーカーとしてのウイルス特異的T細胞モニタリングの可能性を強調している。

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要旨

Importance:

Progressive multifocal leukoencephalopathy (PML) is a life-threatening demyelinating disease caused by reactivation of the JC virus (JCV) in immunocompromised patients. While immune checkpoint inhibitors (ICIs) show therapeutic potential, responses vary and predictive biomarkers are lacking.

Objective:

To determine whether pretreatment JCV- and/or BK virus-specific T cells in the blood are associated with treatment efficacy.

Design, Setting, And Participants:

This retrospective cohort study included 111 patients with PML who were treated with ICIs stratified by peripheral virus-specific T cell presence (ELISpot/flow cytometry) between August 2021 and May 2024, with a median (IQR) follow-up of 7 (1-13) months. Of 112 patients with definite PML across 39 centers, 1 patient refused participation; 111 patients were included.

Exposure:

Patients received pembrolizumab (n = 81), nivolumab (n = 28), or atezolizumab (n = 2) per availability and prescribing practices at participating centers.

Main Outcome And Measures:

Clinical outcomes, diagnostic parameters, and immune-related adverse events were compared; association of virus-specific T-cell responses with survival was analyzed using the Kaplan-Meier method.

Results:

The study cohort consisted of 111 patients (median [IQR] age, 61 [50-70] years; 74 male [66.6%]). Twenty-one patients had detectable virus-specific T cells prior to therapy, 22 were T cell-negative and 68 had an unknown T-cell status. T cell-positive patients showed significantly higher response rates and improved survival compared to both T cell-negative patients (18/21 [86%] vs 5/22 [23%]; P < .001; median survival time, none [95% CI, undefined] vs 136.5 days [95% CI, 19 to ∞]; P = .002) and those with unknown T-cell status (18/21 [86%] vs 29/68 [43%]; P = .001; median survival time, none vs 162 days [95% CI, 66 to ∞]; P = .004). They achieved better functional outcomes (median [IQR] modified Rankin Scale score, 3 [2-4] vs 4 [3-6]; P = .009) and lower JC viral load in cerebrospinal fluid (median [IQR], 0 copies/mL [0-502.5] vs 2500 copies/mL [0-6900]; P = .01) during follow-up compared to T cell-negative patients. Immune-related adverse events were most frequent in T cell-negative patients (10/20 [50%]), including the most severe events, and least frequent in T cell-positive patients (2/20 [10%]) (P = .02).

Conclusions And Relevance:

Preexisting functional virus-specific T cells were associated with better clinical response, longer survival, and lower toxicity in PML. These findings suggest the likely importance of preexisting antiviral immunity for successful ICI therapy.

キーワード:

進行性多巣性白質脳症免疫チェックポイント阻害剤ウイルス特異的T細胞バイオマーカー治療効果

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