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Drug Targeting Organ-Specific Strategies

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XXII Contents<br />

8.5.1.5 Monoclonal Antibody–<strong>Drug</strong> Conjugates . . . . . . . . . . . 213<br />

8.5.1.6 Radioimmunoconjugates . . . . . . . . . . . . . . . . . . . 215<br />

8.5.2 Bispecific Monoclonal Antibodies . . . . . . . . . . . . . . . . . . . . 215<br />

8.5.3 Pro-drug Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217<br />

8.5.3.1 Antibody-directed Enzyme Pro-drug Therapy (ADEPT) . 217<br />

8.5.3.2 Pro-drug Monotherapy . . . . . . . . . . . . . . . . . . . . 217<br />

8.5.4 (Synthetic) (co)Polymers . . . . . . . . . . . . . . . . . . . . . . . . . 218<br />

8.5.5 Liposomes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220<br />

8.6 Clinical Studies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221<br />

8.6.1 MAb and MAb-based Constructs . . . . . . . . . . . . . . . . . . . . 221<br />

8.6.2 Pro-drugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224<br />

8.6.3 (Synthetic) (co)Polymers . . . . . . . . . . . . . . . . . . . . . . . . . 225<br />

8.6.4 Liposomes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225<br />

8.7 Animal Models: their Predictive Value . . . . . . . . . . . . . . . . . . . . . . 226<br />

8.8 Conclusions and Future Perspectives . . . . . . . . . . . . . . . . . . . . . . . 226<br />

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228<br />

9 Tumour Vasculature <strong>Targeting</strong><br />

Daisy W. J. van der Schaft, S. Ramakrishnan, Grietje Molema, Arjan W. Griffioen 233<br />

9.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233<br />

9.1.1 Functions of Vascular Endothelial Cells in the Body . . . . . . . . . . 234<br />

9.1.2 Molecular Control of Tumour Growth-related Angiogenesis . . . . . 234<br />

9.1.2.1 Role of Growth Factors VEGF and FGF-2 . . . . . . . . . 235<br />

9.1.2.2 Role of Integrins . . . . . . . . . . . . . . . . . . . . . . . . 236<br />

9.1.2.3 Role of the Extracellular Matrix . . . . . . . . . . . . . . . 236<br />

9.1.2.4 Role of Subendothelial Support Cells . . . . . . . . . . . . 236<br />

9.2 Angiogenesis Assays and Models . . . . . . . . . . . . . . . . . . . . . . . . . 237<br />

9.2.1 Endothelial Cell Sources . . . . . . . . . . . . . . . . . . . . . . . . . 237<br />

9.2.2 Functional Assays with Endothelial Cells . . . . . . . . . . . . . . . . 238<br />

9.2.2.1 Cell Growth Assays . . . . . . . . . . . . . . . . . . . . . . 238<br />

9.2.2.2 Adhesion and Migration Assays . . . . . . . . . . . . . . . 239<br />

9.2.3 In Vitro Angiogenesis Assays . . . . . . . . . . . . . . . . . . . . . . . 239<br />

9.2.4 In Vivo Assays to Study Angiogenesis and <strong>Targeting</strong> of Angiogenic<br />

Blood Vessels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240<br />

9.3 Tumour Vasculature <strong>Targeting</strong> and Pre-clinical Experience . . . . . . . . . . 241<br />

9.3.1 Growth Factor Receptor <strong>Targeting</strong> . . . . . . . . . . . . . . . . . . . 243<br />

9.3.1.1 VEGF Receptor <strong>Targeting</strong> . . . . . . . . . . . . . . . . . . . 243<br />

9.3.1.2 Other Growth Factor Receptors Used for <strong>Targeting</strong><br />

<strong>Strategies</strong> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245<br />

9.3.2 Endoglin <strong>Targeting</strong> . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245<br />

9.3.3 <strong>Targeting</strong> Integrins to Tumour Vasculature . . . . . . . . . . . . . . . 246<br />

9.3.4 Tumour Vasculature-specific Blood Coagulation Induction . . . . . . 247<br />

9.3.5 Other Potential Targets . . . . . . . . . . . . . . . . . . . . . . . . . . 249

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