JP5897035B2 - 汎用の抗タグキメラ抗原受容体発現t細胞及びがんを治療する方法 - Google Patents
汎用の抗タグキメラ抗原受容体発現t細胞及びがんを治療する方法 Download PDFInfo
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Description
本発明は、米国国立がん研究所によって授与された助成金番号R01CA140917−01及びR01HL088954による政府の支援を受けてなされたものである。合衆国政府は本発明における一定の権利を有し得る。
特に指定のない限り、技術用語は従来の用法に従って使用される。分子生物学における一般用語の定義は例えば、Benjamin Lewin, Genes VII, Oxford University Press刊行, 2000(ISBN019879276X)、Kendrew et al. (編); The Encyclopedia of Molecular Biology, Blackwell Publishers刊行, 1994(ISBN0632021829)、及びRobert A. Meyers (編), Molecular Biology and Biotechnology: a Comprehensive Desk Reference, Wiley, John & Sons, Inc. 刊行, 1995(ISBN0471186341)、並びに他の同様の技術的参照文献に見ることができる。
個別のT細胞ベースの免疫療法の広範な使用を可能にする、適応性のあるCARの生成方法を開発した。ヒトT細胞を、抗FITC CAR−CD28−41BB−CD3ζ(αFITC−CARと称される)を発現するように操作した。このプラットフォームは、抗FITC scFv(細胞表面上)とFITCとの高親和性相互作用、並びにFITC分子(又は他のタグ)を、様々なタイプのがんを有する患者の治療に使用されるセツキシマブ(抗EGFR)、リツキシマブ(抗CD20)及びハーセプチン(抗Her2)等の任意の抗がん型(anti-cancer-based)モノクローナル抗体に安価かつ容易に結合させる能力を利用するものである。この系は抗原に対する極めて高い特異性を可能にし、「自己抗原」に対する交差反応性なしに、強力なエフェクター機能及び増殖能を伴う。
本発明の方法に使用されるエフェクター細胞は自家、同系又は同種異系であってもよく、その選択は治療対象の疾患及び治療に利用可能な手段によって決まる。本方法に使用することができる好適なエフェクター細胞の集団は、T細胞等の細胞溶解活性を有する任意の免疫細胞を含む。例示的なT細胞の亜集団としては、CD3+CD8+T細胞、CD3+CD4+T細胞及びNKT細胞を含むCD3+を発現するT細胞が挙げられるが、これらに限定されない。一態様では、T細胞はHLA−A2+末梢血単核細胞(PBMC)であるが、T細胞はPBMCに由来する任意のHLAバックグラウンドのものであってもよく、自家、同系又は同種異系の系で利用することができる。また、T細胞は治療を受ける被験体の腫瘍移植片、又は治療を受ける被験体の腫瘍内T細胞に由来するものを含む任意の供給源から単離することができる。便宜上、エフェクター細胞は本明細書中でT細胞と一般に称されるが、任意のT細胞への言及は、他に指示のない限り、本明細書中で規定される全てのエフェクター細胞タイプへの言及であることを理解されたい。
当業者であれば、本発明の方法に使用されるT細胞によって発現される抗タグキメラ抗原受容体(AT−CAR)が高い柔軟性を可能にすることを理解するであろう。本方法に使用されるAT−CARの唯一の要件は、(i)AT−CARが、腫瘍関連抗原(TAA)に結合するタンパク質(抗体等)に結合させることができる特定のタグに対して結合特異性を有すること、及び(ii)T細胞をAT−CARを発現するように操作することができることである。要求されるわけではないが好ましい付加的な特徴としては、(i)AT−CARが、T細胞の結合及び活性化の際に効率的な標的溶解を誘導する活性化ドメインを含むこと、並びに(ii)AT−CARのscFv部分を、in vivoで使用される抗体等の標的(すなわち腫瘍)反応性タンパク質に結合させることができる他のタグ、例えばビオチン又はフィコエリトリンに対して特異性を有するものに置き換えることが可能であることが挙げられる。
T細胞は、当業者に容易に知られる手段によってAT−CARを発現するように操作することができる。一般に、AT−CARをコードするポリヌクレオチドベクターを構築し、このベクターをT細胞集団にトランスフェクトする。次いで、細胞をT細胞によるAT−CARの発現を促進する条件下で成長させる。良好なトランスフェクション(すなわちウイルス媒介性の遺伝子組込みを指す形質導入)及びT細胞によるAT−CARの提示は、従来の手段によって行われ、その幾つかを本明細書の実施例で開示する。
AT−CAR発現T細胞集団は、被験体に投与するために当業者に既知の技法を用いて配合することができる。AT−CAR発現T細胞集団を含む配合物には、薬学的に許容される添加剤(単数又は複数)が含まれ得る。配合物に含まれる添加剤は、例えばAT−CARを含むタグ結合ドメインの性質、使用されるT細胞の亜集団、及び投与様式に応じて異なる目的を有する。一般に使用される添加剤の例としては、生理食塩水、緩衝生理食塩水、デキストロース、注射用水、グリセロール、エタノール及びこれらの組合せ、安定剤、可溶化剤及び界面活性剤、緩衝剤及び防腐剤、等張化剤、充填剤、並びに潤滑剤が挙げられるが、これらに限定されない。AT−CAR発現T細胞集団を含む配合物は、通常は動物血清(例えばウシ血清アルブミン)等の任意の非ヒト構成要素の非存在下で調製及び培養される。
タグ付きタンパク質は、AT−CAR発現T細胞の投与の前、又はそれと同時、又はその後に被験体に投与される。タグ付きタンパク質は被験体内の標的細胞に結合する。概して、タグ付きタンパク質の「タンパク質」部分は標的細胞に結合する分子の部分である。例えば、タンパク質は、標的細胞によって発現される腫瘍関連抗原(TAA)又は腫瘍特異的抗原(TSA)に結合する抗体であり得る。しかしながら、「タンパク質」は標的細胞に結合する任意の分子であってもよい。例示的なタンパク質としては、セツキシマブ(抗EGFR)、ニモツズマブ(抗EGFR)、パニツムマブ(抗EGFR)、リツキシマブ(抗CD20)、オマリズマブ(抗CD20)、トシツモマブ(抗CD20)、トラスツズマブ(抗Her2)、ゲムツズマブ(抗CD33)、アレムツズマブ(抗CD52)及びベバシズマブ(抗VEGF)等の抗がん型のモノクローナル抗体が挙げられるが、これらに限定されない。
本発明は、がんを有する被験体を治療する方法であって、治療を必要とする被験体に、がん細胞に結合する1つ又は複数のタグ付きタンパク質の配合物を投与することと、タグ付きタンパク質に結合し、がん細胞死を誘導する1つ又は複数の治療的に有効なAT−CAR発現T細胞集団を投与することと、を含む、方法に関する。「がん」という用語は広範に解釈されることを意図し、異常な細胞成長及び/又は細胞分裂の全ての側面を包含する。例としては、腺癌、扁平上皮癌、腺扁平上皮癌、未分化癌、大細胞癌、小細胞癌を含むが、これらに限定されない癌、及び皮膚、乳房、前立腺、膀胱、膣、頸部、子宮、肝臓、腎臓、膵臓、脾臓、肺、気管、気管支、結腸、小腸、胃、食道、胆嚢のがん;軟骨肉腫、ユーイング肉腫、悪性血管内皮腫、悪性シュワン腫、骨肉腫、軟部組織肉腫を含むが、これらに限定されない肉腫、並びに骨組織、軟骨組織、脂肪組織、筋組織、血管組織及び造血組織のがん;成熟B細胞新生物、例えば慢性リンパ球性白血病/小リンパ球性リンパ腫、B細胞前リンパ球性白血病、リンパ腫及び形質細胞新生物、成熟T細胞新生物及びナチュラルキラー(NK)細胞新生物、例えばT細胞前リンパ球性白血病、T細胞大型顆粒リンパ球性白血病、侵攻性NK細胞白血病、及び成人T細胞白血病/リンパ腫、ホジキンリンパ腫、及び免疫不全関連リンパ増殖異常症を含むが、これらに限定されないリンパ腫及び白血病;精巣がん及び卵巣がんを含むが、これらに限定されない胚細胞腫瘍;肝芽腫、髄芽腫、腎芽腫、神経芽腫、膵芽腫、胸膜肺芽腫及び網膜芽腫を含むが、これらに限定されない芽腫が挙げられる。この用語は良性腫瘍も包含する。
マウス及び細胞株
NOD−scid IL2Rγnull(NSG)マウスは、Jackson Laboratory(Bar Harbor,ME,USA)から購入し、メリーランド大学ボルチモア校の特定病原体除去動物施設に収容し、養子免疫療法のレシピエントとして使用した。実験はメリーランド大学ボルチモア校の動物管理使用委員会によって審査され、承認された。ヒトEGFR+結腸腺癌細胞株SW480(ATCC,Manassas,VA)は、10%加熱不活性化ウシ胎仔血清(Gemini Bio-Products,West Sacramento,CA,USA)、2mM L−グルタミン(GIBCOブランド;Invitrogen)及び1%ペニシリン−ストレプトマイシン(GIBCOブランド;Invitrogen)を添加したダルベッコ変法イーグル培地(DMEM)(GIBCOブランド;Invitrogen,Carlsbad,CA,USA)で維持した。EGFR+HER2+膵臓腺癌細胞株Panc 6.03は、Elizabeth Jaffee博士(ジョンズホプキンス大学シドニーキンメルがんセンター)の厚意で提供され、20%FBS、1%MEM非必須アミノ酸(GIBCOブランド;Invitrogen)、1%ピルビン酸ナトリウム(GIBCOブランド;Invitrogen)、2mM L−グルタミン、1%ペニシリン−ストレプトマイシン及び100IU/mlのインスリンを添加したRPMI 1640培地(GIBCOブランド;Invitrogen)で培養した。HER−2+乳腺癌細胞株AU565(ATCC)は、10%FBS、2mM L−グルタミン及び1%ペニシリン−ストレプトマイシンを添加したRPMI 1640培地で培養した。Phoenix Amphoパッケージング細胞株は、Orbigen(San Diego,CA,USA)から購入し、DMEM、10%FBS、1%ピルビン酸ナトリウム、2mM L−グルタミン及び1%ペニシリン−ストレプトマイシンを含有するD10培地で維持した。SW480細胞株、Panc 6.03細胞株及びAU565細胞株でのEGFR又はHER2の表面発現は、FITC結合セツキシマブ(Ctx)又はFITC結合ハーセプチン(Her2)を用いたフローサイトメトリーによって決定した。
レトロウイルスベクター骨格pMSGV1−CD8−28BBZ(Hughes M.S. et al., Transfer of a TCR gene derived from a patient with a marked antitumor response conveys highly active T-cell effector functions. Hum Gene Ther 2005 Apr;16(4):457-72)は、Richard Morgan博士(米国国立がん研究所)の厚意で提供され、pMSGV(マウス幹細胞ウイルスベースのsplice−gagベクター)に由来するものである。図1Aは、ベクター構築物及び5’末端から3’末端へのフレーム単位の構成要素の配置順序の概略図である。FITCに対するマウスscFvはαFITC−CARと称され、ヒトCD8α鎖(ヌクレオチド配列1271〜1519、Genbank NM001768.6)のヒンジ領域及び膜貫通領域、並びにヒトCD28分子(ヌクレオチド配列760〜882、Genbank NM006139.2)、4−1BB分子(ヌクレオチド配列886〜1026、Genbank NM001561.5)及びCD3ζ分子(ヌクレオチド配列299〜637、Genbank NM000734.3)の細胞質領域に連結する。αFITC−CAR配列は、BlueHeron(Bothell,WA)によって合成されている。
agttgcctgttaggttgttggtgctgatgttctggattcctgcttccagcagtgatgtcgtgatgacccaaactccactctccctgcctgtcagtcttggagatcaagcctccatctcttgcagatctagtcagagccttgtacacagtaatggaaacacctatttacgttggtacctgcagaagccaggccagtctccaaaggtcctgatctacaaagtttccaaccgattttctggggtcccagacaggttcagtggcagtggatcagggacagatttcacactcaagatcagcagagtggaggctgaggatctgggagtttatttctgctctcaaagtacacatgttccgtggacgttcggtggaggcaccaagctggaaatcaaaagtagtgctgatgatgctaagaaggatgctgctaagaaggatgatgctaagaaggatgatgctaagaaggatggtgaggtgaagctggatgagactggaggaggcttggtgcaacctgggaggcccatgaaactctcctgtgttgcctctggattcacttttagtgactactggatgaactgggtccgccagtctccagagaaaggactggagtgggtagcacaaattagaaacaaaccttataattatgaaacatattattcagattctgtgaaaggcagattcaccatctcaagagatgattccaaaagtagtgtctacctgcaaatgaacaacttaagagttgaagacatgggtatctattactgtacgggttcttactatggtatggactactggggtcaaggaacctcagtcaccgtctcc(配列番号1)。この配列をpMSGV1へとライゲートし、αFITC−CARレトロウイルスベクターを生成した。
健常ドナーに由来するHLA−A2+末梢血単核細胞(PBMC)を、Biological Specialty Corp(Colmar,PA,USA)から購入し、Ficoll−Paque(GE Healthcare,Piscataway,NJ,USA)密度勾配遠心分離によって単離した。単離したPBMCを、24ウェル組織培養プレートで5%ヒトAB血清(Sigma-Aldrich)、1%MEM非必須アミノ酸、1%ペニシリン−ストレプトマイシン及び100U/mlの組換えヒトIL−2(BioLegend,San Diego,CA,USA)を添加したAIM V培地(GIBCOブランド;Invitrogen)中、3×106個/ウェルで培養し、50ng/mlのOKT3(eBioscience,San Diego,CA,USA)で活性化した。2日後、レトロウイルス形質導入のために細胞を回収した。形質導入のために、24ウェル非組織培養処理プレート(BD Biosciences,Franklin Lakes,NJ,USA)に、10μg/mlの組換えヒトフィブロネクチンフラグメント(RetroNectin;タカラバイオ株式会社、日本、滋賀県大津市)0.5ml/ウェルを4℃で一晩コーティングした。インキュベーション後、ウェルを2.5%ヒトAB血清を加えた1mlのハンクス液(GIBCOブランド;Invitrogen)を用いて室温で30分間ブロッキングし、2.5%N−2−ヒドロキシエチルピペラジン−N’−2−エタンスルホン酸(HEPES)(GIBCOブランド;Invitrogen)を加えたハンクス液で洗浄した。形質導入は以前に記載されているように行った(Johnson et al. Blood 114, 535-546 (2009))。簡潔に述べると、およそ2.5mlのレトロウイルス上清を各々のコーティングウェルに添加し、続いて32℃で2時間、2000gで遠心分離した。1.5mlのウイルス上清を取り出し、1×106個(0.5ml)の活性化PBMCを、100U/mlのIL−2の存在下で各々のウェルに添加した。プレートを1000gで10分間遠心分離した後、37℃で一晩インキュベートした。形質導入後、細胞を洗浄し、IL−2(100U/ml)の存在下で維持し、形質導入の5日後に実験に使用した。形質導入ヒトT細胞でのαFITC−CARの表面発現を、細胞をCD3又はCD8及びFITC結合セツキシマブで染色した後にフローサイトメトリーによって決定した。一部の実験では、αFITC−CAR形質導入T細胞をFITC結合デキストランビーズで染色した。FITC結合精製ヒトIgG(Invitrogen)で染色した細胞をアイソタイプ対照として使用した。
形質導入の3日〜5日後に、1×105個のT細胞をセツキシマブ、FITC結合セツキシマブ又はFITC−デキストランでコーティングした96ウェル丸底プレートで72時間培養した。腫瘍細胞に対するT細胞特異的反応性のために、SW480細胞に指定の濃度の抗体を37℃で1時間パルスし、3回洗浄した。1×105個のエフェクターT細胞及び1×105個の腫瘍細胞を、96ウェル丸底プレートで72時間、200μlの培養液量で共培養した。採取の16時間前に、0.5μCiの3H−チミジンを各々のウェルに添加した後、1450 LSC&ルミネッセンスカウンター(PerkinElmer,Waltham,MA,USA)を用いてチミジン取り込みを測定した。サイトカイン及びケモカインの産生レベルを、刺激の48時間後に回収した培養上清からサイトカイン/ケモカインキット(Millipore,Billerica,MA,USA)を用いてメーカーの使用説明書に従って測定した。一部の実験では、腫瘍移植片を細かく刻み、37℃で2時間トリプシン中で培養し、続いて陰性選択キット(Invitrogen/Life Technologies,Grand Island,NY)を用いてT細胞濃縮を行った。200000個のT細胞をSW480結腸がん細胞(50000個)と共培養し、これにFITC−Ctx又はCtx(0.5μg/1×106細胞)をパルスした。3日後に[3H]チミジン取り込み(±SD)によって増殖を決定するか、又はMilliplexアレイを用いてサイトカイン及びケモカインの産生を測定した。
腫瘍標的細胞に対する細胞毒性活性を、標準的な51Cr放出アッセイを用いて測定した。1×106個の標的細胞を37℃で2時間、200μCiの51Crで標識し、3回洗浄し、抗ヒト抗体を37℃で1時間パルスした。次いで、1×104個の標識標的細胞を96ウェル丸底プレート、200μlの培養液量で漸減数のエフェクターT細胞と指定のエフェクター対標的(E:T)比で共培養した。培地単独でインキュベートした標的細胞を使用して自然51Cr放出を決定し、標識標的細胞を10%Triton X−100中でインキュベートすることによって最大放出を決定した。37℃で5時間後、50μlの上清を回収し、51Cr放射活性を1450 LSC&ルミネッセンスカウンターで測定した。特異的溶解の平均パーセンテージを以下の方程式に従って算出した:特異的溶解%=(試験放出−自然放出)/(最大放出−自然放出)×100。全ての試験を三連ウェルで行った。結果は平均値±SDとして示す。
予防的腫瘍モデルでは、6週齢〜8週齢の雄NSGマウス(各群についてn=5)の後肢側面に、1〜2×106個のSW480腫瘍細胞又はPanc 6.03腫瘍細胞を皮下(s.c.)注射した。翌日、マウスにFITC−Ctx又はCtx(25μg/マウス)を腹腔内(i.p.)注射した。Ctx注射の翌日、マウスに5×106個のαFITC−CAR形質導入ヒトT細胞を静脈内(i.v.)注射した。養子T細胞移入の後、マウスに抗体(25μg/マウス)を3週間にわたって毎週i.p.注射した。腫瘍部をデジタルキャリパーを用いて盲検下で週2回〜3回測定し、腫瘍サイズ(mm2)を縦径による垂直測定によって算出した。腫瘍サイズが200mm2に達した場合、又はマウスが瀕死状態若しくは歩行困難となった場合にマウスを安楽死させた。全ての実験を独立して少なくとも2回行い、同様の結果を得た。生存データを直接ログランク検定で分析した。
末梢血単核細胞をIL−2の存在下で抗CD3 mAbによって活性化し、続いて図1Aに示され、上に記載したようにα−FITC−CD28−41BB−CD3ζ−CARベクター(αFITC−CARと称される)を形質導入した。T細胞でのαFITC scFvの発現を、細胞を抗CD8(又は抗CD3)及びFITC標識セツキシマブビーズ(FITC−Ctx)又はFITC標識デキストランビーズ(FITC−Dex)で染色することによって分析した。平均すると、全T細胞の60%がαFITC−CARを発現した(図1B)。それらの機能性及び特異性を確認するために、αFITC−CAR T細胞又は対照(モック形質導入)T細胞を、漸増濃度のプレート結合FITC−Ctxビーズ、非結合セツキシマブビーズ、又はFITC−Dexビーズを用いて活性化した。αFITC−CAR T細胞は、FITC−Ctx及びFITC−Dexによる刺激を受けて活発かつ用量依存的に増殖したが、Ctx単独による刺激に応じて分裂しなかった(図1C、左パネル)。対照的に、対照T細胞はFITC−Ctx又はFITC−Dexに対して増殖しなかった(図1C、右パネル)。また、T細胞を漸増濃度のFITC−Ctxで染色したEGFR+結腸がん細胞(SW480)と共培養した。αFITC−CAR T細胞によるFITC反応性が、FITC−Ctx染色がん細胞による活性化を受けて分裂するそれらの能力によって実証された(図1D)。しかしながら、増殖は最低濃度のFITC−Ctxでの対照の増殖と同様であった。対照T細胞は、いずれの濃度のFITC−Ctx染色がん細胞によっても増殖性を示さなかった(図1D)。
αFITC−CAR T細胞を再指向化して、腫瘍細胞をin vivoで排除する能力を検証した。マウスにSW840結腸がん細胞をs.c.注射し、続いてFITC−Ctx又はCtxをi.p.注射によって投与した。翌日、αFITC−CAR T細胞を尾静脈へのi.v.注射によって投与した。腫瘍成長動態はαFITC−CAR T細胞+Ctxを与えたマウスと、Ctx単独を与えたマウスとで同様であった(図2A、左パネル)。全く対照的に、αFITC−CAR T細胞+FITC−Ctxを与えたマウスにおいて腫瘍成長は著しく抑制された(図2A、左パネル)。同様に、腫瘍消失率(tumor-free occurrence)(図2A、中央パネル)及び全生存(図2A、右パネル)は、αFITC−CAR T細胞+FITC−Ctxを与えたマウスにおいて対照群と比較して顕著に改善された。しかしながら、この生存利点にもかかわらず、α−ITC−CAR T細胞+FITC−Ctxを与えたマウスは、腫瘍生着の55日以内に腫瘍チャレンジのため死亡した。
SW480がん細胞でのEGFR発現の不均一性を考慮して、全ての細胞が抗原を発現するがん細胞集団を破壊するαFITC−CAR T細胞の能力を検証した。膵臓がん細胞株Panc 6.03を、EGFRを一様に発現する細胞として選択した(図3A)。αFITC−CAR T細胞の細胞溶解活性を、予防的腫瘍モデルにおいて実験2に記載したものと同じ手順を用いて検証した。腫瘍成長は、αFITC−CAR T細胞+FITC−Ctxを与えたマウスにおいて明らかに抑制され、α−FITC−CAR T細胞+Ctxを与えたマウスは急速な腫瘍成長を示した(図3B、左パネル)。αFITC−CAR T細胞+Ctxを与えた全てのマウスが、腫瘍生着の35日以内に腫瘍チャレンジのため死亡した(図3B、右パネル)。i.v.注射、i.p.注射又は腫瘍内注射によるFITC−Ctxの投与は、全て腫瘍への抗体局在をもたらした(データは示さない)ことは注目に値する。T細胞を腫瘍に再指向化することの代替的方法は、養子移入前にαFITC−CAR T細胞をFITC−Ctxでコーティングすることである。
確立された膵臓腫瘍を破壊するαFITC−CAR T細胞の能力を検証した。膵臓腫瘍を腫瘍が十分に血管新生される3mm2〜10mm2のサイズまで成長させた後、FITC−Ctx又はCtxを注射(i.p.)した。翌日、マウスにαFITC−CAR T細胞を尾静脈注射によって投与した。EGFRに対して再指向化された特異性を有するT細胞は、全てのマウスにおいて確立された膵臓腫瘍を根絶し(図3C、左パネル)、Ctx及びαFITC−CAR T細胞で処理したマウスと比較して生存を改善した(図3C、右パネル)。観察期間中に腫瘍の再発は起こらなかった。
Claims (18)
- がん細胞に結合する1つ又は複数のタグ付き抗体の配合物と同時に又は別々に被験体に投与される、
前記タグ付き抗体に結合し、がん細胞死を誘導する1つ又は複数の治療的に有効な抗タグキメラ抗原受容体(AT−CAR)発現T細胞集団
を含む、抗がん剤であって、
前記AT−CARが、タグ結合ドメイン、膜貫通ドメイン及び活性化ドメインを含み、
前記タグ結合ドメインが抗体又はその抗原結合フラグメントである、
抗がん剤。 - がん細胞に結合する少なくとも2つのタグ付き抗体の配合物と同時に又は別々に被験体に投与される、
前記タグ付き抗体に結合し、がん細胞死を誘導する少なくとも2つの治療的に有効なAT−CAR発現T細胞集団
を含む、抗がん剤であって、
前記AT−CARが、タグ結合ドメイン、膜貫通ドメイン及び活性化ドメインを含み、
前記タグ結合ドメインが抗体又はその抗原結合フラグメントである、
抗がん剤。 - 各々のタグ付き抗体の配合物のタグが同じであるか又は異なり、該タグがフルオレセインイソチオシアネート(FITC)、ストレプトアビジン、ビオチン、ジニトロフェノール、ペリジニンクロロフィルタンパク質複合体、緑色蛍光タンパク質、フィコエリトリン(PE)、ホースラディッシュペルオキシダーゼ、パルミトイル化、ニトロシル化、アルカリホスファターゼ、グルコースオキシダーゼ及びマルトース結合タンパク質からなる群から選択される、請求項1又は2に記載の抗がん剤。
- 各々のタグ付き抗体の配合物の抗体が同じであるか又は異なり、該抗体が全長抗体又はその抗原結合フラグメントである、請求項1〜3のいずれか一項に記載の抗がん剤。
- 前記全長抗体又はその抗原結合フラグメントが、セツキシマブ、ニモツズマブ、パニツムマブ、リツキシマブ、オマリズマブ、トシツモマブ、トラスツズマブ、ゲムツズマブ、アレムツズマブ、又はそのいずれかの抗原結合フラグメントである、請求項4に記載の抗がん剤。
- 各々のAT−CAR発現T細胞集団のAT−CARが同じであるか又は異なる、請求項1〜5のいずれか一項に記載の抗がん剤。
- 前記タグ結合ドメインがFITC、ビオチン、PE、又はストレプトアビジンに特異的に結合する、請求項1又は2に記載の抗がん剤。
- 前記抗原結合フラグメントが一本鎖可変フラグメント(scFv)である、請求項1又は2に記載の抗がん剤。
- 前記抗原結合フラグメントが、FITC、ビオチン、PE、又はストレプトアビジンに特異的に結合する一本鎖可変フラグメント(scFv)である、請求項1又は2に記載の抗がん剤。
- 前記膜貫通ドメインがヒトCD8α鎖のヒンジ領域及び膜貫通領域である、請求項1又は2に記載の抗がん剤。
- 前記活性化ドメインがCD28の細胞質領域、CD137(41BB)の細胞質領域、OX40、HVEM、CD3ζ及びFcRεのうち1つ又は複数を含む、請求項1又は2に記載の抗がん剤。
- 各々のAT−CAR発現T細胞集団のT細胞が同じであるか又は異なり、該T細胞が、末梢血単核細胞(PBMC)に由来する任意のHLAバックグラウンドのT細胞、前記被験体の腫瘍移植片から単離されたT細胞、及び前記被験体の腫瘍内T細胞からなる群から選択される、請求項1〜11のいずれか一項に記載の抗がん剤。
- 各々のAT−CAR発現T細胞集団のT細胞が、HLA−A2+末梢血単核細胞(PBMC)からなる、請求項1〜11のいずれか一項に記載の抗がん剤。
- 前記タグ付き抗体の配合物(単数又は複数)が、前記治療的に有効なAT−CAR発現T細胞集団(単数又は複数)の投与の前に前記被験体に投与される、請求項1〜13のいずれか一項に記載の抗がん剤。
- 前記タグ付き抗体の配合物(単数又は複数)が、前記治療的に有効なAT−CAR発現T細胞集団(単数又は複数)の投与の後に前記被験体に投与される、請求項1〜13のいずれか一項に記載の抗がん剤。
- 前記タグ付き抗体の配合物(単数又は複数)及び前記治療的に有効なAT−CAR発現T細胞集団(単数又は複数)が、任意の順序で前記被験体に投与される、請求項1〜13のいずれか一項に記載の抗がん剤。
- 前記タグ付き抗体に結合するAT−CAR発現T細胞が、細胞傷害性T細胞活性化を誘導する、請求項1〜16のいずれか一項に記載の抗がん剤。
- 前記被験体がヒトである、請求項1〜17のいずれか一項に記載の抗がん剤。
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