JP7576024B2 - Ntrk融合タンパク質を検出するための組織化学的および細胞化学的方法 - Google Patents
Ntrk融合タンパク質を検出するための組織化学的および細胞化学的方法 Download PDFInfo
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Description
この出願は、2018年9月13日に出願された「NTRK融合タンパク質を検出するための組織化学的および細胞化学的方法」と題する米国仮特許出願第62/731,032号の利益を主張し、その内容は参照により全体が本明細書に組み込まれる。
本出願は、2019年9月9日に作成された「P35023-WO PCT fling sequence listing」のファイル名(21,260バイト)を有する、コンピュータ可読形式でこれと共に提出された配列表を参照により組み込む。
別段の定義がない限り、本明細書で使用される技術用語及び科学用語は、当該技術分野の当業者によって一般的に理解されている意味と同じ意味を有する。たとえば、Lackie,DICTIONARY OF CELL AND MOLECULAR BIOLOGY,Elsevier(4th ed.2007);Sambrook et al.,MOLECULAR CLONING,A LABORATORY MANUAL,Cold Springs Harbor Press(Cold Springs Harbor,N.Y.1989)を参照されたい。「1つ(a)」または「1つ(an)」という用語は、「1つ以上」を意味することを意図している。工程または要素の列挙に先行する場合の「含む(comprise)」、「含む(comprises)」、および「含む、含んでいる(comprising)」という用語は、さらなる工程または要素の追加が任意であり、除外されないことを意味することを意図している。
・特定の細胞もしくは組織のタイプもしくは状況の特徴;
・特定の病的状態もしくは状況の特徴;または
・病的状態の重症度、病的状態の進行もしくは退行の可能性、および/または病的状態が特定の治療に反応する可能性の指標。
本開示は、TrkA、TrkB、およびTrkCの1つ以上の保持部分を標的とする第1のバイオマーカー特異的試薬を使用する非神経内分泌NTRK融合タンパク質の親和性組織化学的または細胞化学的に染色されたサンプルに基づく。バイオマーカー特異的試薬は、融合タンパク質をもたらす野生型タンパク質のブレークポイントを識別し、融合タンパク質に保持されているブレークポイントの側にある野生型タンパク質の一部を標的とすることによって選択される。融合タンパク質のブレークポイントを識別するために多くのリソースが利用可能であり、たとえば、ゲノムの位置および結果として得られる融合タンパク質で発現される第1のエクソンによるブレークポイントの注釈が含まれるCOSMICデータベースが挙げられる。例示的な野生型タンパク質配列を表1に示す。
(a)特定の検出試薬;および
(b)特異的検出試薬に結合された酵素であり、該酵素は、適切な反応条件下で発色基質、シグナル伝達コンジュゲートおよび/または酵素反応性色素と反応して、in situでの色素の生成および/または組織サンプルに対する色素の沈着をもたらす。
(2)潜在的反応性部分に連結されたハプテン、および色素、または発色基質と反応性もしくは色素と反応性の酵素に連結された抗ハプテン抗体(例えば、色素がDABの場合のビオチン結合タンパク質に連結されたペルオキシダーゼ)。
一実施形態では、現在開示されている方法によって生成された染色サンプルのセットを使用して、患者サンプル中の融合タンパク質の有無を決定する。典型的な場合には、サンプルは、患者から得られ、上記のように分析のために調製される。サンプルの一部(たとえば、腫瘍切除サンプルの生検の最初の組織切片、または腫瘍細胞の細胞学的サンプルから調製された最初のスライド(細胞塗抹標本(子宮頸管塗抹標本など)、細針吸引物、単離された循環腫瘍細胞など)を調製し、バイオマーカー特異的試薬で染色する。次に、染色されたサンプルを、細胞染色のパーセンテージおよび/または所定の閾値レベル以上で染色された細胞のパーセンテージについてスコア化する。好ましくは、サンプルはホルマリン溶液で固定される。一実施形態では、閾値染色強度は少なくとも1.5+であり、閾値染色強度を有する腫瘍細胞の閾値レベルは25%~75%の範囲にある。一実施形態では、閾値染色強度は少なくとも1.5+であり、閾値染色強度を有する腫瘍細胞の閾値レベルは50%である。一実施形態では、閾値染色強度は少なくとも1.5+であり、閾値染色強度を有する腫瘍細胞の閾値レベルは60%である。一実施形態では、閾値染色強度は少なくとも1.5+であり、閾値染色強度を有する腫瘍細胞の閾値レベルは75%である。一実施形態では、閾値染色強度は少なくとも2+であり、閾値染色強度を有する腫瘍細胞の閾値レベルは25%~75%の範囲にある。一実施形態では、閾値染色強度は少なくとも2+であり、閾値染色強度を有する腫瘍細胞の閾値レベルは50%である。一実施形態では、閾値染色強度は少なくとも2+であり、閾値染色強度を有する腫瘍細胞の閾値レベルは60%である。一実施形態では、閾値染色強度は少なくとも2+であり、閾値染色強度を有する腫瘍細胞の閾値レベルは75%である。
一実施形態では、本明細書に記載のアッセイは、患者からの腫瘍サンプルを特徴づけるために使用される。例えば、生検切片または切除サンプルを得て、固定し、パラフィンに包埋し、切片を作製して染色する。染色された切片を、上記のようにスコア化する。いくつかの実施形態において、融合タンパク質の存在を示すスコアを有する腫瘍は、「融合陽性」として特徴付けられ、一方、融合タンパク質の存在を示さないスコアを有する腫瘍は、「融合陰性」として特徴付けられる。他の実施形態では、「融合陽性」と「融合陰性」との間の中間カテゴリーの細胞は、「境界性(equivocal)」として特徴付けられる。たとえば、スコア化法が、閾値レベル以上で染色する細胞の閾値パーセンテージに基づいている場合、閾値パーセンテージを下回るパーセンテージの範囲は「境界性」と定義され、境界性の範囲未満に含まれる細胞のパーセンテージを有する他のすべてのサンプルは「融合陰性」と見なされる。別の例として、スコア化法が、閾値腫瘍細胞領域内の閾値レベル以上で染色する細胞の閾値パーセンテージに基づいている場合、閾値腫瘍細胞領域を下回るパーセンテージの範囲は「境界性」と定義され、境界性の範囲未満に含まれる細胞のパーセンテージを有する他のすべてのサンプルは「融合陰性」と見なされる。
腫瘍タイプ全体のTrk融合の存在を予測できるスコア化アルゴリズムを開発できるかどうかを評価するために、複数の適応症にわたる3000を超える組織のIHC染色および分析を実施した。
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Claims (15)
- 非神経内分泌腫瘍サンプル中のTrkA、TrkB、またはTrkCの融合タンパク質を検出する方法であって、
-以下:配列番号1の残基363~760を含む、もしくはそれらからなるアミノ酸配列;配列番号2の残基646~838を含む、もしくはそれらからなるアミノ酸配列;または、配列番号3の残基718~839を含む、もしくはそれらからなるアミノ酸配列のうちの1つ以上に特異的に結合するバイオマーカー特異的試薬で前記サンプルを親和性組織化学染色することと、
-前記サンプルの核染色を検出することと、
-検出された前記核染色が、閾値染色強度を超えて特異的に染色される閾値隣接腫瘍細胞領域内の腫瘍細胞の閾値パーセンテージ以上である染色パターンを有する場合、前記サンプルをTrkA、TrkB、またはTrkCが関与する融合タンパク質に対して陽性としてスコア化すること、
を含み、
前記閾値隣接腫瘍細胞領域が、少なくとも20個の隣接細胞である、
方法。 - 前記閾値パーセンテージが25%~80%の範囲にあり、前記閾値染色強度がバックグラウンドを超える任意の特異的染色である、請求項1に記載の方法。
- 前記閾値パーセンテージが25%~75%であり、第1の特異的染色強度が0.5+より大きい、請求項1に記載の方法。
- 前記閾値パーセンテージが20%~90%の範囲にあり、前記閾値染色強度がバックグラウンドを超える任意の特異的染色である、請求項1~3のいずれか一項に記載の方法。
- 前記閾値隣接腫瘍細胞領域が少なくとも50個の細胞であり、前記閾値染色強度が0.5+以上であり、前記閾値パーセンテージが25%~75%の範囲にある、請求項1~4のいずれか一項に記載の方法。
- 前記バイオマーカー特異的試薬が抗体であり、前記抗体が、配列番号2のアミノ酸816~838からなるアミノ酸配列に配置されたエピトープに対して免疫特異的である、請求項1~5のいずれか一項に記載の方法。
- 前記抗体がモノクローナル抗体のクローンEPR17341である、請求項6に記載の方法。
- 前記親和性組織化学染色が、
(a)前記サンプルを熱誘導エピトープ回復プロセスに供すること、および
(b)前記サンプルをバイオマーカー特異的試薬および検出試薬のセットと接触させて、前記サンプルに結合した任意のバイオマーカー特異的試薬の近くに明視野色素を沈着させること、
を含む、請求項1~7のいずれか一項に記載の方法。 - (b1)前記バイオマーカー特異的試薬が、配列番号1の残基363~760からなるアミノ酸配列;配列番号2の残基646~838からなるアミノ酸配列;および配列番号3の残基718~839からなるアミノ酸配列のそれぞれと特異的に免疫反応性である抗体であり、かつ
(b2)前記検出試薬のセットが、(b1)の前記抗体と免疫反応性の二次抗体、前記二次抗体と免疫反応性があり、酵素に結合した三次抗体、および前記サンプルへの明視野色素の沈着をもたらす前記酵素と反応性の試薬のセットを含む、請求項8に記載の方法。 - 前記二次抗体がハプテン化されており、前記三次抗体が抗ハプテン抗体である、請求項9に記載の方法。
- 非神経内分泌腫瘍サンプル中のNTRK再配列を検出する方法であって、請求項1~10のいずれか一項に記載の方法に従って前記サンプル中のTrk融合タンパク質の存在を検出することと、前記サンプルがTrkA、TrkB、またはTrkCが関与する融合タンパク質に対して陽性としてスコア化される場合、シーケンシング、逆転写ポリメラーゼ連鎖反応、またはin situハイブリダイゼーションによってNTRK再配列について前記サンプルをスクリーニングすることと、を含む方法。
- Trk融合陽性またはTrk融合陰性のいずれかとしてサンプルを識別するステップと、シーケンシング、逆転写ポリメラーゼ連鎖反応、またはin situハイブリダイゼーションによって、NTRK再配列についてTrk融合陰性であるサンプルをスクリーニングすることを含むスクリーニングステップと、をさらに含む請求項11に記載の方法。
- Trk融合陽性、Trk融合境界性(Equivocal)またはTrk融合陰性のいずれかとしてサンプルを識別するステップと、シーケンシング、逆転写ポリメラーゼ連鎖反応、またはin situハイブリダイゼーションによって、NTRK再配列についてTrk融合境界性であるサンプルをスクリーニングすることを含むスクリーニングステップと、をさらに含む請求項11に記載の方法。
- 非神経内分泌腫瘍サンプルがTrkA、TrkBもしくはTrkCが関与するTRK融合タンパク質に対して陽性としてスコア化される場合、またはNTRK再配列が検出される場合に、Trk指向療法を受ける患者を選択することをさらに含み、
隣接腫瘍細胞の閾値レベルが少なくとも20個の隣接する細胞であり、前記閾値パーセンテージが20%~90%の範囲にあり、閾値染色強度がバックグラウンドを超える任意の特異的染色である、
請求項12または13に記載の方法。 - Trk指向療法を受ける患者を選択する方法であって、請求項1~10のいずれか一項に記載の方法に従って非神経内分泌腫瘍サンプル中のTrk融合タンパク質の存在を検出することと、前記サンプルがTrkA、TrkBもしくはTrkCが関与する融合タンパク質に対して陽性としてスコア化される場合、またはNTRK再配列が検出される場合に、前記療法を受ける前記患者を選択することと、を含み、
隣接腫瘍細胞の閾値レベルが少なくとも20個の隣接する細胞であり、前記閾値パーセンテージが20%~90%の範囲であり、閾値染色強度がバックグラウンドを超える任意の特異的染色である、
方法。
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US20210199655A1 (en) | 2021-07-01 |
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