JP2020502263A - Nsclcを有する患者の処置のための薬剤及び応答を予測するための方法 - Google Patents
Nsclcを有する患者の処置のための薬剤及び応答を予測するための方法 Download PDFInfo
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Abstract
Description
本発明者らは、本明細書において、生体サンプル中のmiRNAの発現のレベルを評価する工程又は求める工程を含む、方法を提供する。発現のレベルを評価することは、特に、前記miRNAの絶対量の直接的な測定を指す。発現のレベルを評価することはまた、前記レベルの相対的な測定、特に、前記miRNAの量を、他のRNA、特に他のmiRNAの量に対して求める方法工程を指す場合もある。
(i)患者から予め得た生体サンプル、好ましくは、腫瘍サンプル中の、miR-24-3p、miR-23a-3p及びmiR-27a-3pからなる群から選択される少なくとも1つのmiRNAの発現レベルを評価する工程と、任意に、(ii)前記miRNAの発現レベルを基準レベルと比較する工程と、任意に、(iv)患者において測定された発現レベルが前記基準レベルと等しいか又はそれよりも高い場合に、患者のプラチナベースの化学療法に対する抵抗性の見込みが増加していると結論する工程と、を含む。
がんを患っている患者における使用のためのプラチナベースの化学療法剤であって、前記患者のサンプル中のmiR-24-3p及び/又はmiR-24-2クラスターのmiRNAの発現レベルは、本明細書において開示されているいずれかの方法に従って評価されており、特に、前記レベルは基準値よりも低いと決定されている、プラチナベースの化学療法剤が本明細書において提供され。
miR-24-3pの過剰発現が、プラチナベースの化学療法剤に対する抵抗性に直接関与することが本発明者らによって示された。したがって、本発明者らは、本明細書において、miR-24-3pの過剰発現又は過剰発現の影響を阻害する工程を含む、そのような化学療法剤に対する応答を改善させる方法を提供する。
機能性遺伝子スクリーニングは、がん薬物抵抗性遺伝子の発見及び検証に対する極めて有力なアプローチである(Iornsら、2007年)。したがって、本発明者らは、このアプローチを使用して、miRbaseバージョン16に対応するmiRNA模倣物のライブラリーを使用して発現の増加が肺腺癌細胞のシスプラチン抵抗性を誘発するmiRNAを広範囲に特定した。機能獲得データは、約10のmiRNAの過剰発現がシスプラチン抵抗性を再現可能に誘発することを示している(2回行った模倣物ライブラリーを使用した独立した2回のスクリーニング)(図1A)。重要なことに、スクリーニングで特定され、発現の増加がシスプラチン抵抗性と最も関連づけられるいかなるmiRNAも、LUADのシスプラチン応答に影響を及ぼすことは現在示されていない。更に、スクリーニングにおいて特定された10のmiRNAのうちの5つは、A549細胞でも発現した(図1B)。したがって、本発明者らは、まずA549細胞で発現するmiRNA、miR-24-3pに的を絞る選択をし、統計学及びその過剰発現によって付与される抵抗性の程度に従って最良のmiRNA候補として特定した。重要なことに、miR-24-3pは、NSCLCにおいてでもアップレギュレートされることが知られている(Zhaoら、2015年)。
関連するmiR-24-3p標的遺伝子を特定するために、本発明者らは、2つの異なる相補的なアプローチを使用した(図3)。
シスプラチンがDNA傷害を誘導することによって細胞死を開始したため、本発明者らは、シスプラチンに曝露されたA549細胞におけるmiR-24-3pの過剰発現が、アポトーシスが生じる前のATMが関係するDNA損傷応答に影響を与えるかどうかを調査した。本発明者らの結果は、miR-24-3pを過剰発現しているA549細胞が、シスプラチン曝露の7時間後に、腫瘍細胞におけるシスプラチンの配置に影響を及ぼすことなく、低いDNA損傷(リン酸γH2AX核内フォーカスによって評価した)を示し、ATMシグナル伝達も低下することを示した(図5)。
9〜12週齢の雄のC57BL/6マウス及びmiR-24-3pに対して設計したLNA修飾オリゴヌクレオチドを使用してインビボ実験を行った。miR-24-3pのこれらのインヒビターをExiqon社から購入した:配列がTGCTGAACTGAGCC(配列番号11)のLNA miR-24-3pインヒビター番号1及び配列がGCTGAACTGAGCC(配列番号12)のLNA miR-24-3pインヒビター番号2。
本発明者らは、TCGAデータベースから腫瘍small RNA-seqデータを有するLUAD患者の293症例を収集した。本発明者らは、診断の5年後の患者の生存状態による、患者の2つのサブグループにおけるmiR-24-3pの発現を分析し、全体的な発現が生きている患者と死亡した患者の間で有意に異なることがわかった(図13、パネルA)。興味深いことに、本発明者らは、同じクラスターから発現した2つの他の成熟miRNAによる同様のデータを見出した(図13、パネルB及びC)。カプランマイヤー生存解析から、これら3つのmiRNAのそれぞれの発現が高い患者の群が低発現群と比較して短い生存期間を有することが明らかになった(図13、パネルD、E及びF)。これらのデータもクラスターの3つのmiRNAの平均発現値を使用して確認した(図13、パネルG)。
miR-24-3pは、1つの一次miRNAとして転写されたmiRNAクラスターの一部であり、その後、3つの成熟miRNA:miR-23a-3p、miR-27a-3p及びmiR-24-3pにプロセシングされるため、本発明者らは、miR-23a-3p及び/又はmiR-27a-3pもシスプラチン抵抗性に寄与するかどうか評価した。A549 LUAD細胞株において実施された本発明者らの結果は、miR-24-3pよりも低い程度ではあるが、miR-23a-3pの過剰発現もA549細胞のシスプラチン抵抗性を誘発することが可能であることを示した(図11)。興味深いことに、本発明者らは、これらのmiRNAの間にいくつかの共通の予想される標的を発見し、それらのいくつかはアポトーシス性/壊死性細胞死及びPPIF及びNEK6等のDNA損傷と関連づけられている(図12)。
TCGAからのデータの解析は、miR-24-3p及びそのクラスターの他のメンバーの高い発現レベルがLUADがん患者の不良な予後と関連づけられることを示した(図13)。本発明者らは、シスプラチン抵抗性の予測のためのLUAD患者の肺組織又は血漿中のmiR-24-3p発現の予測値を特に評価するために局地的な有望なコホート(P. Hofman及びC-H Marquette、CHU Nice)を作り上げた。この目的のため、生体液中の循環miR-23a-27a-24-2クラスターの検出のためにマルチプレックスqPCRプロトコルを設定した(図14)。データは、本発明者らが14人の健康なドナーのコホートからの血漿中のmiR-23a-27a-24-2クラスターを含む60を超えるmiRNA候補のレベルを再現性よく測定できたことを示した。LUAD患者(さまざまな診断ステージ)からの第1のセットの20の血清に対して得た事前のデータは、miR-23a-27a-24-2クラスターの血中レベルが健康なドナーと比較してLUADではアップレギュレートされたことを示した(図15)。
RNA単離。肺組織及び細胞サンプルからTRIzol溶液(Invitrogen社)により全RNAを抽出した。RNAの完全性は、Agilent BioAnalyser 2100(Agilent Technologies社)を使用することによって評価した(RIN 7超)。
Claims (19)
- 肺がんを有するヒト患者の処置における使用のための、miR-24-3pのインヒビター、特にロックド核酸。
- 前記患者は、非小細胞肺がん(NSCLC)、特に肺腺癌(LUAD)、とりわけステージIII又はIVのNSCLC及び/又はLUADを有する、請求項1に記載の使用のためのmiR-24-3pのインヒビター。
- プラチナベースの化学療法剤との組み合わせにおける使用のための、請求項1又は2に記載の使用のためのmiR-24-3pのインヒビター。
- 肺がんを有するヒト患者、特に、非小細胞肺がん(NSCLC)及び/又は肺腺癌(LUAD)、とりわけステージIII又はIVのNSCLC及び/又はLUADを有するヒト患者におけるプラチナベースの化学療法に対する応答の改善における使用のための、miR-24-3pのインヒビター、特にロックド核酸。
- miR-24-3pのインヒビター、特にロックド核酸、及びプラチナベースの化学療法剤を含む、化合物の組み合わせ。
- 前記化合物の組み合わせは、前記miR-24-3pインヒビター及び前記化学療法剤の同時投与に適している、請求項5に記載の化合物の組み合わせ。
- 前記化合物の組み合わせは、前記miR24-3pインヒビター及び前記化学療法剤の時間を空けた投与に適している、請求項5又は6に記載の化合物の組み合わせ。
- 肺がんを有するヒト患者、特に、NSCLC及び/又はLUAD、とりわけステージIII又はIVのNSCLC及び/又はLUADを有するヒト患者の処置における使用のための、請求項5から7のいずれか一項に記載の化合物の組み合わせ。
- 肺がんを有するヒト患者におけるプラチナベースの化学療法に対する応答の見込みを決定するインビトロ方法であって、患者から予め得た生体サンプル中のmiR-24-3p、miR-23a-3p及びmiR-27a-3pからなる群から選択される少なくとも1つのmiRNAの発現のレベルを評価する工程を含む、方法。
- 前記患者は、非小細胞肺がん(NSCLC)、特に肺腺癌(LUAD)を有する、請求項9に記載の方法。
- 前記患者は、ステージIII又はIVのNSCLC及び/又はLUADを有する、請求項10に記載の方法。
- 前記生体サンプルは、前記患者の腫瘍からのサンプルであるか、又は前記生体サンプルは、前記患者からの血液サンプルである、請求項9から11のいずれか一項に記載の方法。
- 前記発現レベルは、miR-24-3p、miR-23a-3p及びmiR-27a-3pからなる群から選択される1つ、2つ又は3つのmiRNAに関して評価される、請求項9から12のいずれか一項に記載の方法。
- 前記miRNAの発現レベルは、定量的PCR(qPCR)、リアルタイムqPCR及び発現マイクロアレイからなる群から選択される少なくとも1つの方法を使用して測定される、請求項9から13のいずれか一項に記載の方法。
- 前記miRNAの発現レベルは、予め設定した基準レベルと比較され、前記基準レベルは、特に、LUADがんを有する患者の群において測定された平均発現レベル又は発現レベル中央値であり、前記群の前記患者は、プラチナベースの化学療法に対する応答に関して選択されていないか、又は選択された非応答者患者である、請求項9から14のいずれか一項に記載の方法。
- 前記患者の腫瘍からの生体サンプル中の前記miRNAの発現レベルは、前記患者の非腫瘍組織からの生体サンプル中の発現レベルである基準レベルと比較される、請求項9から15のいずれか一項に記載の方法。
- miR-24-3p、miR-23a-3p及びmiR-27a-3pからなる群から選択される少なくとも2つのmiRNAの発現レベル、及び、任意に、前記miRNAの平均発現レベルが比較のために使用される、請求項9から16のいずれか一項に記載の方法。
- 前記患者の前記生体サンプルにおいて測定された発現レベルが前記基準レベルと等しいか又はそれよりも高い場合に、前記患者のプラチナベースの化学療法に対する抵抗性の見込みが増加していると結論する工程を更に含む、請求項9から17のいずれか一項に記載の方法。
- 前記患者由来の生体サンプル中の前記miR-24-2クラスター由来の少なくとも1つのmiRNAの発現レベルが、特に請求項9から18のいずれか一項に記載の方法に従って、評価され、とりわけ、前記miR-24-2クラスター由来の少なくとも1つのmiRNAの発現レベルは、前記患者の生体サンプル中の基準値と等しいか又はそれよりも高いと決定されている、請求項1から4のいずれか一項に記載の使用のためのmiR-24-3pのインヒビター又は請求項6から8のいずれか一項に記載の使用のための化合物の組み合わせ。
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