JP2008508325A - Vegf−bアンタゴニストを含む癌治療方法 - Google Patents
Vegf−bアンタゴニストを含む癌治療方法 Download PDFInfo
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Abstract
Description
本明細書で参照される出版物の書誌的詳細は、本明細書の最後にもまとめて示す。
本発明を詳細に説明する前に、特に明記された部分以外は、本発明が、成分の特異的な剤形、製造法、投与量、または診断法などに制限されないことを理解されたい。本明細書で使用される専門用語が、特定の態様を説明することだけを目的としており、制限する意図はないことも理解されたい。
VEGFタンパク質の作製
一般的事項
ヒトおよびマウスのVEGF-Bタンパク質およびVEGF-Aタンパク質を、ヒトのVEGF-B B10-108に関して過去に報告された一般的な方法(Scotney et al., 2002, supra, Scrofani et al., 2000, Protein Science, 9:2018-2025)に従って作製した。この方法を、マウスのVEGF-B B10-108の作製に関して以下に詳しく説明する。この方法で作製されるタンパク質は当初、6×Hisタグと実際のVEGF-Bのアミノ酸配列の開始点の間に6×HisタグおよびGenenase I用の切断部位を含む、追加的な16アミノ酸をN末端に有する。望ましいならば、この追加のアミノ酸は、以下に概説する一般的な手順で、酵素による切断によって除去される。タンパク質上のタグおよび切断部位の有無を以下に示す:6×His.hVEGF-B10-108は、N末端のタグおよび切断部位を含む成熟型のヒトVEGF-Bのアミノ酸10〜108位を含むタンパク質を意味する。hVEGF-B10-108は、N末端のタグおよび切断部位を有しない同じタンパク質を意味する。他のタンパク質は同じ方法で表される。
一般には前掲のScotneyらの手順に従って、6×HisタグおよびGenenase I切断部位を含むマウスのVEGF-B10-108(6×His.mVEGF-B10-108)を6×His.mVEGF-B10-108pET-15b(Novagen, USAのカタログ番号70755-3のpET-15bベクター)による大腸菌BL21-Codon-Plus-[DE3]-RP株(Stratagene, USA)への形質転換後の細菌発酵によって、組換えタンパク質として産生させた。発現レベルを決定するために、IPTGによる誘導前と誘導の1時間後、2時間後、および3時後に試料を回収し、SDS-PAGEと、抗6×His mAb(マウスのmAb、QIAGEN, USA)を使用するウェスタンブロットで評価した。HRP結合二次試薬(ヒツジ抗マウス抗体、Chemicon, USA)と発光基質(PerkinElmer, USA)を使用して、結合状態のmAbをオートラジオグラフィーで可視化した。
N末端の6×Hisタグが、以下に示すように酵素的切断によってヒトVEGF-Aおよび/またはVEGF-Bの調製物から除去された場所に注目されたい。簡単に説明すると、5 mgの凍結乾燥状態のタグ付きタンパク質を、わずかな容積の1 mM酢酸(500μl)に再懸濁し、100×容量(50 ml)のGenenase I消化溶液(5μg/ml Genenase I、100 mM Tris-HCl、5 mM CaCl2、200 mM NaCl、0.02% Tween-20)を添加した。この材料を21℃で24時間、軽く混合しながらインキュベートした後に、0.1 M 酢酸で透析を行って反応を停止させた。消化された材料を次に逆相クロマトグラフィーで精製し、文献(前掲のScotney et al.)に記載された手順で凍結乾燥状態のアリコートとして保存した。
細胞ベースのアッセイ法および生化学的アッセイ法でVEGF-Bの活性と拮抗する、ヒトVEGF-Bに特異的なマウスモノクローナル抗体
組換え型のヒト(h)VEGF-Bイソ型に対するモノクローナル抗体を標準的な手順で作製した(Harlow and Lane, Antibodies - A Laboratory Manual, Cold Spring Harbour Laboratory, Chapter 6, 1988を参照)。簡単に説明すると、BALB/cマウスまたはC57BL/6マウスを、初回接種用に完全フロインドアジュバント(CFA)中に、および続く免疫用に不完全フロインドアジュバント中に乳化した約10〜30μgのhVEGF-B(hVEGF-B167、hVEGF-B10-108、またはhVEGF-B186のいずれか1つ、N末端の6×Hisタグを含むものと含まないもの)を腹腔内(i.p)経路で免疫化した(少なくとも2週間、3〜4週間ほどの期間をおく)。融合の3日前、および最後のi.p.による免疫化の少なくとも3〜4週後にマウスを約10μgのhVEGF-B(溶媒はリン酸緩衝食塩水(PBS))で静脈内(i.v.)経路で追加免疫した。脾臓細胞とSp2/O-Ag14ミエローマ融合パートナーの融合と、続くHAT(ヒポキサンチン、アミノプテリン、およびチミジン)による選択後に、hVEGF-Bに特異的なmAbを分泌するハイブリドーマをELISAで同定し、増殖させた後に、少なくとも2回、限界希釈によりクローン化した。
モノクローナルAbのアンタゴニスト活性を、新しいVEGFR-1/EpoR/BaF3増殖アッセイ法で評価した。このアッセイ法は、キメラ受容体を発現する改変BaF3(DSMZ、カタログ番号ACC 300)細胞が、ヒトエリトロポイエチン受容体(EpoR)の細胞内ドメイン、およびVEGFR-1の細胞外ドメインを含むことをベースとしている。VEGF-AおよびVEGF-BなどのVEGFR-1のリガンドは、キメラ受容体の二量体化を引き起こし、続いてEpoRの細胞質ドメインがリン酸化されると、下流の情報伝達分子が活性化され、BaF3細胞の増殖につながる。この方法は、数種類のサイトカインおよび成長因子を対象とした増殖ベースの生物学的アッセイ法を開発するために使用されている(例えばMurayama et al., J. Biol, Chem., 269, 5976-5980, 1994;Fukada et al., Immunity 5, 449-460, 1996;Stacker et al., J. Biol. Chem., 274, 34884-34892, 1999を参照)。改変BaF3細胞は、10% FCS、Zeocin (250μg/ml、Invitrogen, USA)、hVEGF-A165(50 ng/ml)、ペニシリン(50ユニット/ml、Invitrogen, USA)、ストレプトマイシン(50μg/ml、Invitrogen, USA)、およびGlutaMAX-I (2 mM, Invitrogen, USA)を添加したDMEM(Invitrogen, USA)中で維持する。
モノクローナル抗体が、VEGF-BとVEGFR-1のリガンド結合断片の結合をブロックする能力を、新しい競合的ELISAで測定した。第2のIg様ドメイン(D2-VEGFR-1、前掲のScotney et al.;Weismann et al., Cell 91, 695-704, 1997を参照)に対応する、VEGFR-1の組換え断片を使用してマイクロタイタープレートをコーティングした。段階希釈の試験mAbとプレインキュベートしておいた、固定された飽和濃度以下の組換えhVEGF-B10-108(5 nM)を次に、このプレート上でインキュベートした。1時間後にプレートを洗浄し、引き続いてウサギ抗ヒトVEGF-B167血清、マウス抗ウサギ-Ig西洋ワサビペルオキシダーゼコンジュゲート、およびTMB基質で処理した。酸によるクエンチング後に、450 nmにおける非色分析で測定したELISAシグナルは、プレートに結合した状態のD2-VEGFR-1に捕捉されたVEGF-B10-108の量に比例していた。mAbによる結合の用量依存的な阻害は、VEGF-B10-108との結合をめぐるmAbとD2-VEGFR-1間の競合の指標となった。アッセイの結果から、mAb 2H10、1C6、および2F5はVEGF-B10-108とD2-VEGFR-1の結合を拮抗可能であるが、4E12は拮抗不能であることが判明した。このデータは、アンタゴニストmAb 4E12が、D2-VEGFR-1との直接的な相互作用には関与しないVEGF-Bの領域と結合することを示唆している。
ヒトVEGF-B特異的アンタゴニストであるマウスモノクローナル抗体の動的解析
動的解析
mAbと標的VEGF-Bの結合の動的解析には、BIAcore(商標) 2000表面プラズモン共鳴装置(Biacore AB, Uppsala, Sweden)を使用するバイオセンサーベースの方法を用いた。バイオセンサーチップを、VEGF-Bの共有結合的なカップリングのためにN-エチル-N'-(3-ジメチルアミノプロピル)-カルボジイミド塩酸(EDC)、およびN-ヒドロキシスクシニミド(NHS)を供給業者(Biacore AB, Uppsala, Sweden)の指示書に従って使用して活性化させた。5μg/mlのVEGF-B10-108(溶媒は20 mM酢酸ナトリウム、pH 4.8)の溶液を調製し、アリコート(35μl)を2μl/分の流速で注入して、約500〜600反応ユニット(RU)のカップリング形成タンパク質が得られた。最後に1 Mのエタノールアミンをブロッキング剤として注入した。
マウスVEGF-Bと交差反応し、この活性を阻害する、ヒトVEGF-Bに対するモノクローナル抗体
hVEGF-Bに対するモノクローナル抗体を、mVEGF-Bとの交差反応性に関して、標準的なELISAフォーマットを用いて検討した。プレートに結合させたhVEGF-B10-108または6×His.mVEGF-B10-108(濃度1.25μg/ml)とmAbをインキュベートし、結合状態のmAbをHRP結合二次試薬およびTMB基質を使用して可視化した。得られた結果から、mAb 4E12のみが、ヒトおよびマウスのVEGF-Bのいずれとも相互作用しなかったことがわかる。
ヒト腫瘍細胞株のならし培地中におけるVEGF-Bの検出
ヒト腫瘍細胞株2008(卵巣)、A431(類表皮癌)、H460(非小細胞肺)、HT-29(結腸)、MDA-MB-231(乳房)、およびPC-3(前立腺)は、Peter MacCallum Cancer Centreから入手した。細胞株は常用の手順で、10%ウシ胎児血清(FCS)、ペニシリン(50ユニット/ml、Invitrogen, USA)、およびストレプトマイシン(50μg/ml、Invitrogen, USA)、およびGlutaMAX(Invitrogen, USA)を添加したRPMI培地(Invitrogen, USA)中で、接着性細胞として37℃で5% CO2の存在下で継代した。VEGF-B産生細胞株の解析では、コンフルエント培養物を、8.0 mlの培地を含み、ヘパリン(100μg/ml, Sigma, USA)を添加または非添加の条件で100 mmのペトリ皿中に約1:20となるように希釈した。14日後に遠心分離して培養上清を回収し、全VEGF-Bタンパク質のレベル(VEGF-B167+VEGF-B186のイソ型)を標準的なサンドイッチELISAアッセイ法で評価した。サンドイッチELISAは、抗VEGF-B mAb(VEGF-B167およびVEGF-B186に反応性のもの)を結合させたマイクロタイタープレートについて行い、捕捉されたVEGF-Bをウサギ抗VEGF-Bポリクローナル抗体と、続いてHRP結合抗ウサギIg試薬(Chemicon)を使用して検出した。試験VEGF-Bを、組換えVEGF-Bタンパク質を対象に作成された標準曲線を用いて定量した。
ヒト腫瘍細胞株HT-29のマウス異種移植試験
ヒトの腫瘍の成長を潜在的に制限する新しい治療薬を、十分に特性が明らかにされたマウス異種移植モデルを用いて、インビボにおける有効性に関して評価することができる。実施例5で説明したように、免疫不全マウスに移植するといずれも充実性腫瘍として成長するいくつかのヒト腫瘍細胞株は、VEGF-Bタンパク質を発現する。
治療用のヒト化mAbを作製するためのmAb 2H10の可変領域遺伝子のクローニング
2H10 mAbを産生するハイブリドーマ細胞からメッセンジャーRNAを調製し、可変領域配列を逆転写してRT-PCRで増幅した。N末端のアミノ酸配列、および抗体のアイソタイプに基づく部分的に縮重するPCRプライマーを使用して、軽鎖の可変領域を増幅した。N末端のリーダーペプチドをコードする配列とアニーリングするように設計されたフォワードプライマーと、抗体アイソタイプに基づくリバースプライマーを使用して重鎖可変領域を増幅した(Coloma et al., 1991, Larrick et al., 1989)。得られたPCR産物の配列決定から、2H10の可変領域のアミノ酸配列が判明した。アンタゴニストmAbである4E12および2F5の可変領域のアミノ酸配列を同一の方法で決定した(表1;図8〜10参照)。
ヒト腫瘍細胞株DU145のマウス異種移植試験
実施例6に記載したように、ヒトの腫瘍の成長を潜在的に制限する新しい治療薬のインビボにおける有効性を、十分に特性が明らかにされたマウス異種移植モデルを使用して評価することができる。
ヒト腫瘍細胞株A431のマウス異種移植試験
実施例6に記載したように、ヒトの腫瘍の成長を潜在的に制限する新しい治療薬のインビボにおける有効性を、十分に特性が明らかにされたマウス異種移植モデルを使用して評価することができる。
抗VEGF-B mAb 2H10のヒト化
CDRグラフトFabおよびマウス-ヒトキメラFabの作製
VBASEデータベース(ヒト抗体遺伝子のデータベースhttp://vbase.mrc-cpe.cam.ac.uk/)を使用して、実施例7に記載され、および図1に示された2H10の可変領域の配列に近縁のヒト生殖系列の可変領域の配列を見つけた。EmBLデータベース配列X93622およびJ00242(それぞれ、ヒトの非再編成型生殖系列(unrearranged germline)の抗体の軽鎖領域PK9およびJK4)、ならびにHSIGDP75およびJ00256(それぞれ、ヒトの非再編成型生殖系列の抗体の重鎖領域DP75およびJH4a)(図4)を後のCDRグラフト用に選択した。
VEGF-Bに対するCDR-Fabの結合親和性を、競合ベースの結合アッセイ法(例えばELISAフォーマットでFabをファージディスプレイする方法)、またはBiacore解析で可溶性タンパク質を精製する方法などのいくつかの様式で、マウス-ヒトキメラFabおよび2H10マウスFabのVEGF-B結合親和性と比較することができる。
Claims (39)
- VEGF-Bアンタゴニストの有効量を、治療を必要とする被験体に投与する段階を含む、哺乳動物における癌の治療方法。
- 癌が、腫瘍、前癌性状態、骨髄腫、またはリンパ腫である、請求項1記載の方法。
- 腫瘍が、乳房腫瘍、結腸直腸腫瘍、腺癌、中皮腫、膀胱腫瘍、前立腺腫瘍、生殖細胞腫瘍、肝癌/胆管の癌、神経内分泌腫瘍、下垂体新生物、小円形細胞腫瘍、扁平上皮癌、黒色腫、非定型的線維黄色腫、精上皮腫、非精上皮腫(nonseminoma)、間質性ライディヒ細胞腫瘍、セルトリ細胞腫瘍、皮膚腫瘍、腎臓腫瘍、精巣腫瘍、脳腫瘍、卵巣腫瘍、胃腫瘍、口腔腫瘍、膀胱腫瘍、骨腫瘍、頚部腫瘍(cervical tumor)、食道腫瘍、喉頭腫瘍、肝臓腫瘍、肺腫瘍、膣腫瘍、およびウィルムス腫瘍から選択される、請求項2記載の方法。
- 癌が充実性腫瘍である、請求項1記載の方法。
- VEGF-Bアンタゴニストが、VEGF-Bをコードする核酸分子を標的とし、かつVEGF-Bの発現を阻害するアンチセンスオリゴヌクレオチドである、請求項1〜4のいずれか一項記載の方法。
- VEGF-Bアンタゴニストが、VEGF-Bをコードする核酸分子を標的とし、かつVEGF-Bの発現を阻害する干渉核酸分子である、請求項1〜4のいずれか一項記載の方法。
- VEGF-Bアンタゴニストが、VEGF-BとVEGFR-1の結合を阻害する抗VEGF-B抗体である、請求項1〜4のいずれか一項記載の方法。
- 抗体がモノクローナル抗体である、請求項7記載の方法。
- 抗体がヒトVEGF-Bと1×10-7 Mまたはこれ未満のKD値で結合する、請求項8記載の方法。
- 抗体がヒト抗体またはヒト化抗体である、請求項9記載の方法。
- 抗体が、請求項9記載の完全抗体の抗原結合断片である、請求項7記載の方法。
- 抗原結合断片が、Fv、Fab、またはF(ab')2断片、1本鎖Fv断片(sFvもしくはscFv)、ジスルフィド安定化(disulphide stabilized)Fv断片(dsFv)、1本鎖可変領域ドメイン(Abs)分子、ならびにミニボディおよびダイアボディから選択される、請求項11記載の方法。
- VEGF-Bアンタゴニストが、ヒトのVEGF-B、および少なくとも1種の他の動物に由来するVEGF-Bと交差反応する、請求項1〜12のいずれか一項記載の記載の方法。
- VEGF-Bアンタゴニストが、ヒトVEGF-BおよびマウスVEGF-Bと交差反応する、請求項13記載の方法。
- ヒトのVEGF-Bと1×10-7 Mまたはこれ未満のKD値で結合する、VEGF-BとVEGFR-1の結合を阻害する、単離された抗VEGF-B抗体。
- モノクローナル抗体である、請求項15記載の抗体。
- ヒト抗体またはヒト化抗体である、請求項16記載の抗体。
- 請求項17記載の抗体の抗原結合断片。
- 抗原結合断片が、Fv、Fab、またはF(ab')2断片、1本鎖Fv断片(sFvもしくはscFv)、ジスルフィド安定化Fv断片(dsFv)、1本鎖可変領域ドメイン(Abs)分子、ならびにミニボディおよびダイアボディから選択される、請求項18記載の抗原結合断片。
- ヒトVEGF-B、および少なくとも1種の他の動物に由来するVEGF-Bと交差反応する、請求項15〜19のいずれか一項記載の抗体または抗原結合断片。
- ヒトVEGF-BおよびマウスVEGF-Bと交差反応する、請求項20記載の抗体または抗原結合断片。
- mAb 2H10の重鎖および軽鎖の可変領域に由来する4つ、5つ、または6つ全てのCDR配列を含む、請求項15〜21のいずれか一項記載の抗体。
- mAb 2F5の重鎖および軽鎖の可変領域に由来する4つ、5つ、または6つ全てのCDR配列を含む、請求項15〜21のいずれか一項記載の抗体。
- mAb 1C6の重鎖および軽鎖の可変領域に由来する4つ、5つ、または6つ全てのCDR配列を含む、請求項15〜21のいずれか一項記載の抗体。
- 請求項15〜24のいずれか一項記載の抗体を含む組成物。
- 請求項22〜24のいずれか一項記載の抗体の有効量を、治療を必要とする被験体に投与する段階を含む、哺乳動物における癌の治療方法。
- 配列番号:5〜7に示された配列を有するCDR、または配列番号:5〜7に示された配列に対して少なくとも約80%の同一性を有するCDRをもつ軽鎖を含む、請求項17記載の単離された抗VEGF-B抗体。
- 配列番号:8〜10に示された配列を有するCDR、または配列番号:8〜10に示された配列に対して少なくとも約80%の同一性を有するCDRをもつ重鎖を含む、請求項17記載の単離された抗VEGF-B抗体。
- 配列番号:5〜10に示された配列を有するCDR、または配列番号:5〜10に示された配列に対して少なくとも約80%の同一性を有するCDRを含む、請求項17記載の単離された抗VEGF-B抗体。
- 配列番号:29および30に示された配列を有する可変重鎖および可変軽鎖配列、または配列番号:29および30に示された配列に対して少なくとも約80%の同一性を有する可変重鎖および可変軽鎖配列を含む、請求項27記載の単離された抗VEGF-B抗体。
- 2005年7月27日にATCCに寄託されたアクセッション番号__のハイブリドーマ細胞株によって産生される抗体と競合する、単離された抗VEGF-B抗体。
- 2005年7月27日にATCCに寄託されたアクセッション番号__のハイブリドーマ細胞株によって産生される抗体と同じか、または実質的に同じエピトープと結合する、請求項31記載の単離された抗VEGF-B抗体。
- 請求項27〜32のいずれか一項記載の抗体の有効量を、治療を必要とする被験体に投与する段階を含む、哺乳動物における癌の治療方法。
- 請求項27〜32のいずれか一項記載の抗体を含む組成物。
- 配列番号:31、33、および35のヌクレオチド配列、または配列番号:31、33、および35に示された配列に対して少なくとも約80%の同一性を有するヌクレオチド配列を含む、請求項30記載の抗VEGF-B抗体の軽鎖をコードする核酸。
- 配列番号:37、39、および41のヌクレオチド配列、または配列番号:37、39、および41に示された配列に対して少なくとも約80%の同一性を有するヌクレオチド配列を含む、請求項30記載の抗VEGF-B抗体の重鎖をコードする核酸。
- 請求項35記載の核酸および請求項36記載の核酸を原核生物または真核生物の宿主細胞で発現可能な、請求項35記載の核酸および請求項36記載の核酸を含む発現ベクター。
- 請求項37記載の発現ベクターを含む、原核生物または真核生物の宿主細胞。
- 以下の段階を含む、請求項30記載の抗VEGF-B抗体を産生させる方法:
(a)請求項38記載の宿主細胞を、抗体の発現を可能とするのに十分な期間、培養する段階、および(b)発現された抗体を精製する段階。
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JP2011190494A Active JP5662912B2 (ja) | 2004-08-02 | 2011-09-01 | Vegf−bアンタゴニストを含む癌治療方法 |
JP2014163996A Withdrawn JP2014224149A (ja) | 2004-08-02 | 2014-08-12 | Vegf−bアンタゴニストを含む癌治療方法 |
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EP (2) | EP2476427B1 (ja) |
JP (3) | JP5014130B2 (ja) |
AU (1) | AU2005269265B2 (ja) |
CA (1) | CA2575901C (ja) |
DK (2) | DK1781321T3 (ja) |
ES (1) | ES2456943T3 (ja) |
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JP2016540047A (ja) * | 2013-11-28 | 2016-12-22 | シーエスエル、リミテッド | 腎症を処置する方法 |
JP2017501182A (ja) * | 2013-12-18 | 2017-01-12 | シーエスエル リミティド | 創傷を治療する方法 |
CN109310884A (zh) * | 2016-04-21 | 2019-02-05 | Csl有限公司 | 治疗或预防肝病的方法 |
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- 2005-08-02 US US11/659,179 patent/US8822644B2/en active Active
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- 2005-08-02 ES ES05764158.1T patent/ES2456943T3/es active Active
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JP2014505698A (ja) * | 2011-02-02 | 2014-03-06 | グラクソ グループ リミテッド | 新規抗原結合タンパク質 |
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JP2020029459A (ja) * | 2013-11-28 | 2020-02-27 | シーエスエル、リミテッド | 腎症を処置する方法 |
JP2017501182A (ja) * | 2013-12-18 | 2017-01-12 | シーエスエル リミティド | 創傷を治療する方法 |
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JP7065786B2 (ja) | 2016-04-21 | 2022-05-12 | シーエスエル リミティド | 肝病態を治療又は予防する方法 |
Also Published As
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CA2575901C (en) | 2015-01-27 |
DK2476427T3 (en) | 2018-05-07 |
EP1781321A1 (en) | 2007-05-09 |
JP2014224149A (ja) | 2014-12-04 |
AU2005269265A1 (en) | 2006-02-09 |
JP5662912B2 (ja) | 2015-02-04 |
CA2575901A1 (en) | 2006-02-09 |
EP1781321A4 (en) | 2009-11-18 |
HK1103654A1 (en) | 2007-12-28 |
AU2005269265B2 (en) | 2012-01-12 |
EP2476427A2 (en) | 2012-07-18 |
EP2476427A3 (en) | 2012-10-03 |
US20140363445A1 (en) | 2014-12-11 |
US8822644B2 (en) | 2014-09-02 |
ES2456943T3 (es) | 2014-04-24 |
WO2006012688A1 (en) | 2006-02-09 |
PL1781321T3 (pl) | 2014-07-31 |
EP1781321B1 (en) | 2014-01-08 |
JP2012036189A (ja) | 2012-02-23 |
DK1781321T3 (da) | 2014-04-14 |
EP2476427B1 (en) | 2018-01-17 |
US20080260729A1 (en) | 2008-10-23 |
JP5014130B2 (ja) | 2012-08-29 |
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