JP6768786B2 - 最適な癌療法のためのFR−αおよびGARTタンパク質の定量 - Google Patents
最適な癌療法のためのFR−αおよびGARTタンパク質の定量 Download PDFInfo
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Description
癌患者を治療するための新規の改善された方法が提供される。この方法は、患者からの腫瘍組織中の特定のタンパク質のレベルを測定し、次いで、それらのレベルに基づいて、最適化された投薬計画で患者を治療する。より具体的には、この方法は、治療する医師が、抗癌薬であるペメトレキセド、および/またはGARTタンパク質を攻撃することによって同様に腫瘍細胞を死滅させる働きをする、ロメトレキソール、AG2034、LY309887およびペリトレキソールなどの葉酸代謝拮抗薬クラスの他の抗癌薬を含む治療計画での治療に患者が奏効するかまたは奏効する可能性が高いかどうかを確認することを可能にする。
患者
37名の患者は、非小細胞肺癌(NSCLC)を有すると確認された。治療前に、腫瘍を外科的に除去し、ホルマリン固定パラフィン包埋(FFPE)組織として保存し、総てを組織学的に腺癌として確認した。続いて、37名の患者総てをシスプラチンおよびペメトレキセドの標準的な併用化学療法計画で処置した。
FFPE腫瘍組織の腫瘍細胞を手に入れ、組織顕微解剖によって腫瘍組織から単離し、上記のLiquid Tissue試薬を用いた下流の質量分析のために可溶化した。選択反応モニタリング質量分析(SRM−MS)を用いてタンパク質レベルを定量した。FR−αおよびGARTタンパク質を含む様々なタンパク質のレベルに関連するこの研究における患者の全生存曲線を作成した。
初期診断およびペメトレキセドを用いた治療計画の開始後の生存延長から明らかなように、治療薬ペメトレキセドによって特異的に標的とされるタンパク質を含む複数のタンパク質にわたる定量的SRM/MRMデータは、GARTおよびFR−αタンパク質の組合せレベルと、ペメトレキセドを用いた癌患者の治療による良好な治療結果との強く有意な相関を示す。GARTタンパク質単独では、ペメトレキセドおよびシスプラチンを用いた治療に対する全生存の増加との相関(p=0.007)を示した。FR−αタンパク質単独では、ペメトレキセドおよびシスプラチンを用いた治療に対する全生存の増加との相関(p=0.089)を示さなかった(図1および図2)。しかしながら、GARTおよびFR−αタンパク質の両方の組合せは、ペメトレキセドおよびシスプラチンを用いた治療からのこの癌患者集団における全生存の増加と非常に有意な相関(p=0.0005)を示した(図3)。他のタンパク質の定量的レベルは、全生存曲線に示される生存の増加の欠如から明らかなように、ペメトレキセドおよびシスプラチンを用いた治療に対する良好な治療結果と相関しなかった(図4〜6)。
Claims (13)
- 肺癌に罹患している患者の治療を選択するための指標を提供する方法であって、
(a)その患者から得られた腫瘍サンプルから調製されたタンパク質消化物中の配列番号1で示される指定のFR−αフラグメントペプチドのレベルおよび配列番号2で示される指定のGARTフラグメントペプチドのレベルを定量し、質量分析を用いた選択反応モニタリングにより前記サンプル中のFR−αペプチドおよびGARTペプチドの両方のレベルを計算する工程;
(b)前記FR−αフラグメントペプチドのレベルをFR−α参照レベルと比較し、前記GARTフラグメントペプチドのレベルをGART参照レベルと比較する工程;
(c)そのGARTフラグメントペプチドのレベルが前記参照レベルより低く、かつ、そのFR−αフラグメントペプチドのレベルが検出される場合に、有効量のペメトレキセドを含んでなる治療計画を選択するための指標を提供する工程;および
(d)そのGARTフラグメントペプチドのレベルが前記参照レベルを上回り、かつ、そのFR−αフラグメントペプチドが検出されない場合に、有効量のペメトレキセドを含まない治療計画を選択するための指標を提供する工程
を含んでなる、方法。 - GARTフラグメントペプチドの前記参照レベルが、分析された生体サンプルタンパク質900amol/μg、+/−250amol/μg、+/−150amol/μg、+/−100amol/μg、+/−50amol/μg、または+/−25amol/μgであり、かつ、前記FR−αフラグメントペプチドが、検出の下限を上回って検出されるかまたは検出されない、請求項1に記載の方法。
- 有効量のペメトレキセドを含んでなる前記治療計画が、有効量のシスプラチンをさらに含んでなる、請求項1または2に記載の方法。
- 前記タンパク質消化物がプロテアーゼ消化物を含んでなる、請求項1〜3のいずれか一項に記載の方法。
- 前記タンパク質消化物がトリプシン消化物を含んでなる、請求項4に記載の方法。
- 前記質量分析が、タンデム型質量分析、イオントラップ型質量分析、トリプル四重極型質量分析、MALDI−TOF型質量分析、MALDI型質量分析、イオントラップ/四重極ハイブリッド型質量分析および/または飛行時間型質量分析を含んでなる、請求項1〜5のいずれか一項に記載の方法。
- 使用される質量分析の様式が、選択反応モニタリング(SRM)、多重反応モニタリング(MRM)、並列反応モニタリング(PRM)、知的選択反応モニタリング(iSRM)、および/または多重選択反応モニタリング(mSRM)である、請求項6に記載の方法。
- 前記腫瘍サンプルが、細胞、細胞集合体、または固形組織である、請求項1〜7のいずれか一項に記載の方法。
- 前記腫瘍サンプルがホルマリン固定固形組織であり、かつ、前記組織はパラフィン包埋組織である、請求項8に記載の方法。
- 前記生体サンプルの前記タンパク質消化物が、Liquid Tissueプロトコールによって調製される、請求項9に記載の方法。
- 前記指定のFR−αフラグメントペプチドを定量することが、既知量のスパイクされた内部標準ペプチドと比較することによって前記サンプル中のそのFR−αペプチドの量を決定することを含んでなり、その生体サンプル中の天然ペプチドおよびその内部標準ペプチドの両方は、配列番号1に示されるFR−αフラグメントペプチドの同じアミノ酸配列に対応する、請求項1〜10のいずれか一項に記載の方法。
- 前記指定のGARTフラグメントペプチドを定量することが、既知量のスパイクされた内部標準ペプチドと比較することによって前記サンプル中のそのGARTペプチドの量を決定することを含んでなり、その生体サンプル中の天然ペプチドおよびその内部標準ペプチドの両方は、配列番号2に示されるGARTフラグメントペプチドの同じアミノ酸配列に対応する、請求項1〜11のいずれか一項に記載の方法。
- 前記内部標準ペプチドが同位体標識ペプチドであり、かつ、前記ペプチドは、18O、17O、15N、13C、および2H、またはそれらの組合せから選択される少なくとも1つの安定重同位体を含んでなる、請求項11または12に記載の方法。
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