- •Foreword
- •List of contributors
- •Preface
- •Dedication and Acknowledgments
- •Evolving knowledge in pharmacologic treatments
- •MEDICAL TREATMENT
- •VERTEPORFIN
- •ANTI-VEGF TREATMENT
- •OTHER MEDICAL TREATMENTS
- •“PLAYERS” IN OCULAR TREATMENT
- •THE DRUG
- •ROUTE OF ADMINISTRATION
- •Eye drops
- •Soluble ophthalmic drug inserts
- •Ion drug exchange
- •Intravitreal injections
- •Systemic administration
- •Sustained drug delivery system
- •Intraocular implants
- •Microparticles and nanoparticles
- •Liposomes
- •Encapsulated cell technology (ECT)
- •Iontophoresis
- •REFERENCES
- •SECTION 1: Basic Sciences in Retina
- •Retinal anatomy and pathology
- •INTRODUCTION
- •KEY CONCEPTS AND FUNDAMENTALS
- •NORMAL RETINAL ANATOMY
- •RETINAL PATHOLOGY
- •Congenital abnormalities
- •Dystrophies
- •Degenerations
- •Vascular diseases
- •Toxicities
- •Inflammatory diseases
- •Neoplasms
- •Retinal detachment
- •Trauma
- •Involvement of systemic diseases
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •Retinal biochemistry, physiology, and cell biology
- •INTRODUCTION
- •VITREOUS BIOCHEMISTRY
- •VITREOUS DEGENERATION WITH AGING
- •PHYSIOLOGICAL AND PATHOLOGICAL CHANGES IN THE VITREORETINAL INTERFACE
- •BLOOD–RETINAL BARRIER
- •TIGHT JUNCTIONS
- •BLOOD–RETINA BARRIER DISRUPTION
- •MECHANISMS OF RETINAL ARTERIOLAR CALIBER CHANGES
- •MECHANISMS OF RETINAL VENULAR CALIBER CHANGES
- •MACULAR PIGMENTS
- •FUNCTIONS OF MACULAR PIGMENTS
- •Antioxidant
- •Optical filter
- •VISUAL CYCLE
- •RETINOID CYCLE
- •Outer segment of photoreceptors
- •Retinal pigment epithelium
- •Re-entry into the outer segment
- •Chaperones
- •PHOTOTRANSDUCTION
- •Activation
- •Inactivation
- •RETINAL PIGMENT EPITHELIUM AND LIPOFUSCIN
- •RETINAL PIGMENT EPITHELIUM
- •LIPOFUSCIN
- •Formation of lipofuscin
- •Lipofuscin and RPE atrophy
- •Stargardt’s disease and lipofuscin
- •Age-related macular degeneration and lipofuscin
- •MATRIX BIOLOGY
- •STRUCTURAL COMPOSITION OF THE BRUCH’S MEMBRANE
- •MACROSCOPIC CHANGES OF THE BRUCH’S MEMBRANE
- •CELL BIOLOGY OF BRUCH’S MEMBRANE
- •LIPID ACCUMULATION
- •MATRIX DYSREGULATION
- •MATRIX METALLOPROTEINASES
- •PHARMACOTHERAPY IMPLICATIONS
- •REFERENCES
- •INTRODUCTION
- •PROMOTERS OF ANGIOGENESIS
- •VEGF in physiologic and pathologic angiogenesis
- •Investigational approaches to VEGF inhibition in ocular neovascularization
- •RNA interference
- •Soluble VEGFR fusion protein: VEGF-Trap
- •Anecortave acetate
- •PLATELET-DERIVED GROWTH FACTOR
- •FIBROBLAST GROWTH FACTOR 2 (FGF2)
- •TUMOR NECROSIS FACTOR-α (TNF-α)
- •EPHS AND EPHRINS
- •NOTCH
- •ANGIOPOIETINS
- •Angiopoietin 1
- •Angiopoietin 2
- •ERYTHROPOIETIN
- •MATRIX METALLOPROTEINASES
- •INTEGRINS
- •COMPONENTS OF THE COMPLEMENT CASCADE
- •INHIBITORS OF ANGIOGENESIS
- •PIGMENT EPITHELIUM-DERIVED FACTOR
- •SOLUBLE VEGF RECEPTOR 1
- •VEGFXXXb ISOFORMS
- •COMPLEMENTARY REGULATORY PROTEIN C59
- •TRYPTOPHANYL-tRNA SYNTHASE FRAGMENT
- •OTHER INHIBITORS
- •SUMMARY
- •REFERENCES
- •Ocular immunity and inflammation
- •INTRODUCTION
- •HISTORY
- •KEY CONCEPTS AND FUNDAMENTALS IN MOLECULAR BIOLOGY AND BIOCHEMISTRY
- •INNATE IMMUNITY
- •ADAPTIVE IMMUNITY
- •MECHANISMS OF PATHOGENESIS
- •NONINFECTIOUS POSTERIOR AND PANUVEITIS
- •INFECTIOUS RETINITIS AND CHOROIDITIS
- •AGE-RELATED MACULAR DEGENERATION
- •DIABETIC RETINOPATHY
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •INTRODUCTION
- •HISTORY
- •KEY CONCEPTS IN COMPLEMENT BIOLOGY
- •SUMMARY
- •REFERENCES
- •Genetics of retinal disease
- •INTRODUCTION
- •HISTORY OF RETINAL GENE DISCOVERY
- •KEY CONCEPTS AND FUNDAMENTS OF GENETIC METHODS IN THE STUDY OF RETINAL DISEASE
- •GENETICS: ILLUMINATING MECHANISMS OF PATHOGENESIS, REVEALING COMPLEXITY
- •RP: A “COMPLEX” MONOGENIC DISEASE
- •SHEDDING LIGHT ON AMD
- •DELIVERY OF GENES TO TARGET PATHOGENIC PATHWAYS
- •GENE-INDEPENDENT THERAPY
- •SUMMARY: THE FUTURE IS BRIGHT
- •REFERENCES
- •SECTION 2: Animal Models and Routes for Retinal Drug Delivery
- •Vitamins and supplements for age-related macular degeneration
- •INTRODUCTION
- •HISTORY
- •KEY CONCEPTS AND PHARMACOLOGY OF CURRENT DIETARY SUPPLEMENTS
- •EPIDEMIOLOGIC DATA OF ASSOCIATION OF FAT AND ω-3 LCPUFAs WITH AMD
- •AVAILABLE SUPPLEMENTS FOR MACULAR DEGENERATION
- •IMPLICATIONS OF RETINAL SUPPLEMENT PHARMACOLOGY
- •FUTURE DIRECTIONS: AREDS2
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •Ocular pharmacokinetic, drug bioavailability, and intraocular drug delivery systems
- •INTRODUCTION
- •INTRAVITREAL ADMINISTRATION
- •OCULAR PHARMACOKINETICS
- •TOPICAL FORMULATIONS
- •CONVENTIONAL FORMULATIONS
- •INTRAOCULAR DRUG DELIVERY SYSTEMS
- •NONBIODEGRADABLE IMPLANTS
- •INTRAOCULAR BIODEGRADABLE DRUG DELIVERY SYSTEMS
- •ACKNOWLEDGMENTS
- •REFERENCES
- •INTRODUCTION
- •THE RATIONALE FOR INTRAVITREAL DRUG DELIVERY
- •HISTORY
- •KEY CONCEPTS AND FUNDAMENTAL POINTS IN RETINAL DRUG DELIVERY
- •STRATEGIES AND IMPLICATIONS FOR RETINAL PHARMACOTHERAPY
- •PREOPERATIVE PREPARATION
- •PROPHYLAXIS OF ENDOPHTHALMITIS: LOCAL DISINFECTION AND TOPICAL ANTIBIOTIC THERAPY
- •LOCAL TOPICAL ANESTHESIA
- •SURGICAL TECHNIQUES FOR RETINAL DRUG DELIVERY
- •THE PROCEDURE AND RECOMMENDED TECHNIQUE
- •COMPLICATIONS WITH THE ROUTE FOR DRUG DELIVERY
- •OCULAR COMPLICATIONS
- •PHARMACOKINETICS AND CLEARANCE OF INTRAVITREAL DRUGS
- •PHARMACOKINETICS OF INTRAVITREAL CRYSTALLINE TRIAMCINOLONE ACETONIDE
- •CLINICAL EXPERIENCE AND RESULTS IN VITRECTOMIZED, AIR-FILLED, OR SILICONE OIL EYES
- •VITRECTOMIZED EYES
- •Silicone oil tamponade
- •Gas tamponade
- •PREOPERATIVE DRUG APPLICATIONS
- •INTRAOPERATIVE DRUG APPLICATIONS
- •POSTOPERATIVE DRUG APPLICATIONS
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •INTRODUCTION
- •HISTORY
- •KEY CONCEPTS
- •ANIMAL MODELS
- •DRUG DELIVERY MODALITIES
- •TOPICAL DRUG DELIVERY
- •TRANSSCLERAL DRUG DELIVERY
- •SUPRACHOROIDAL DRUG DELIVERY
- •INTRAVITREAL GAS-PHASE NANOPARTICLE DRUG DELIVERY
- •SUMMARY AND KEY POINTS
- •ACKNOWLEDGMENT
- •REFERENCES
- •INTRODUCTION
- •HISTORY
- •KEY CONCEPTS AND FUNDAMENTAL POINTS IN SUSTAINED-RELEASE DRUG DELIVERY
- •EXISTING SUSTAINED-RELEASE DRUG DEVICES
- •BIODEGRADABLE POLYMER IMPLANTS
- •LIPOSOME ENCAPSULATION
- •CELLULAR ENCAPSULATION
- •THE FUTURE
- •SUMMARY
- •ACKNOWLEDGMENT
- •REFERENCES
- •INTRODUCTION
- •PERMEATION BARRIERS AND ANATOMICAL CONSIDERATIONS
- •THEORETICAL BACKGROUND
- •CYCLODEXTRINS
- •ANIMAL TESTING OF ROUTES OF DRUG DELIVERY
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •Thermo-sensitive hydrogels
- •INTRODUCTION
- •DELIVERY CHARACTERISTICS
- •POTENTIAL DELIVERY SITE
- •TOXICITY TESTING
- •FUTURE DIRECTION
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •Retina and ocular toxicity to ocular application of drugs
- •INTRODUCTION
- •HISTORY
- •MAJOR CLASSES OF DRUGS AND THEIR SAFETY PROFILE AFTER LOCAL OCULAR APPLICATION FOR RETINA THERAPY
- •CORTICOSTEROIDS
- •ANTIBIOTICS
- •NONSTEROIDAL ANTI-INFLAMMATORY DRUGS
- •ENZYMES AND FIBRINOLYTICS
- •MISCELLANEOUS ANTI-INFLAMMATORY AND ANTIANGIOGENIC AGENTS
- •Summary and Key points
- •ACKNOWLEDGMENTS
- •REFERENCES
- •INTRODUCTION
- •KEY CONCEPTS AND FUNDAMENTALS
- •PHARMACOLOGY, BIOCHEMISTRY, AND TYPE OF IMPACT ON THE RETINA
- •DISRUPTION OF THE RETINA AND RETINAL PIGMENT EPITHELIUM
- •Phenothiazines
- •Thioridazine
- •Chlorpromazine
- •Chloroquine derivatives
- •Chloroquine
- •Hydroxychloroquine
- •Quinine sulfate
- •Clofazimine
- •2′,3′-dideoxyinosine (DDI)
- •Deferoxamine
- •Corticosteroid preparations
- •Cisplatin and BCNU (carmustine)
- •Potassium iodate
- •VASCULAR DAMAGE OR OCCLUSION
- •Quinine sulfate
- •Cisplatin and BCNU (carmustine)
- •Talc
- •Oral contraceptives
- •Aminoglycoside antibiotics
- •Interferon
- •Miscellaneous agents
- •CYSTOID MACULAR EDEMA AND RETINAL EDEMA/FOLDS
- •CYSTOID MACULAR EDEMA
- •Epinephrine and dipivefrin
- •Nicotinic acid
- •Prostaglandin analogues
- •Retinal edema/folds
- •Sulfa antibiotics, acetazolamide, ethoxyzolamide, chlorthalidone, hydrochlorothiazide, triamterene, metronidazole
- •Topiramate
- •CRYSTALLINE RETINOPATHY
- •TAMOXIFEN
- •CANTHAXANTHINE
- •METHOXYFLURANE
- •TALC
- •NITROFURANTOIN
- •UVEITIS
- •RIFABUTIN
- •CIDOFOVIR
- •LATANOPROST
- •CARDIAC GLYCOSIDES
- •SILDENAFIL
- •METHANOL
- •VIGABATRIN
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •INTRODUCTION
- •DISEASE PREVALENCE AND INFLUENCE
- •RISK FACTORS
- •ETIOLOGY/PATHOGENESIS
- •SIGNS AND SYMPTOMS
- •TREATMENT OPTIONS
- •VITAMIN C
- •CAROTENOIDS
- •VITAMIN E
- •MINERALS
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •Neovascular age-related macular degeneration
- •DISEASE PREVALENCE AND INFLUENCE
- •RISK FACTORS
- •ETIOLOGY/PATHOGENESIS
- •NATURAL HISTORY
- •NONPHARMACOLOGIC THERAPIES
- •PHARMACOLOGIC THERAPIES
- •PDT WITH VERTEPORFIN
- •PEGAPTANIB
- •RANIBIZUMAB
- •BEVACIZUMAB
- •COMBINATION THERAPY
- •TREATMENTS UNDER INVESTIGATION
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •Diabetic retinopathy and diabetic macular edema
- •INTRODUCTION
- •DIABETIC RETINOPATHY PREVALENCE
- •RISK FACTORS
- •ETIOLOGY AND PATHOGENESIS
- •SIGNS AND SYMPTOMS
- •TREATMENT OPTIONS
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •Retinal vein occlusion
- •INTRODUCTION
- •DISEASE PREVALENCE
- •RISK FACTORS
- •PATHOGENESIS
- •CENTRAL RETINAL VEIN OCCLUSION
- •BRANCH RETINAL VEIN OCCLUSION
- •TREATMENT OPTIONS
- •CENTRAL RETINAL VEIN OCCLUSION
- •BRANCH RETINAL VEIN OCCLUSION
- •TREATMENT OUTCOMES AND PROGNOSIS
- •CENTRAL RETINAL VEIN OCCLUSION
- •TISSUE PLASMINOGEN ACTIVATOR (tPA)
- •CORTICOSTEROIDS
- •BEVACIZUMAB
- •OTHER MEDICATIONS
- •Ranimizumab
- •Coumadin (warfarin)
- •Urokinase
- •Troxerutin
- •Ticlodipine
- •Pentoxifylline
- •Hemodilution
- •Laser treatment
- •Chorioretinal venous anastomosis
- •SURGICAL TREATMENT OF CRVO
- •Radial optic neurotomy (ron)
- •Branch retinal vein occlusion
- •Corticosteroids
- •Bevacizumab
- •Ranimizumab
- •Laser treatment
- •SURGICAL TREATMENT OF BRVO
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •Retinal detachment and proliferative vitreoretinopathy
- •INTRODUCTION
- •INCIDENCE OF RETINAL DETACHMENT
- •ETIOLOGY AND RISK FACTORS FOR RETINAL DETACHMENT
- •RISK FACTORS FOR PROLIFERATIVE VITREORETINOPATHY
- •SIGNS, SYMPTOMS, AND DIAGNOSIS
- •TREATMENT OPTIONS
- •PROGNOSIS WITH THE VARIOUS TREATMENT OPTIONS
- •ADJUNCTIVE THERAPIES
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •Posterior Uveitis
- •INTRODUCTION
- •DISEASE PREVALENCE AND INFLUENCE
- •RISK FACTORS
- •PATHOGENESIS
- •SPECIFIC DISEASES: DIAGNOSIS AND PHARMACOTHERAPY
- •ADAMANTIADES–BEHÇET DISEASE
- •Diagnostic features
- •Treatment modalities
- •BIRDSHOT RETINOCHOROIDOPATHY
- •Diagnostic features
- •Treatment modalities
- •Treatment modalities
- •SARCOIDOSIS
- •Diagnostic features
- •Treatment modalities
- •SERPIGINOUS CHOROIDOPATHY
- •Diagnostic features
- •Treatment modalities
- •VOGT–KOYANAGI–HARADA SYNDROME
- •Diagnostic features
- •Treatment modalities
- •SYMPATHETIC OPHTHALMIA
- •Diagnostic features
- •Treatment modalities
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •INTRODUCTION
- •DISEASE PREVALENCE
- •RISK FACTORS
- •MYOPIA
- •PRESUMED OCULAR HISTOPLASMOSIS SYNDROME
- •OTHER INFLAMMATORY CAUSES
- •ANGIOID STREAKS
- •IDIOPATHIC CNV
- •ETIOLOGY AND PATHOGENESIS
- •DIAGNOSIS AND ANCILLARY TESTING
- •MYOPIA
- •PRESUMED OCULAR HISTOPLASMOSIS SYNDROME
- •ANGIOID STREAKS
- •INFLAMMATORY CAUSES
- •DIFFERENTIAL DIAGNOSIS
- •CLINICAL SIGNS AND SYMPTOMS
- •MYOPIA
- •PRESUMED OCULAR HISTOPLASMOSIS SYNDROME
- •ANGIOID STREAKS
- •INFLAMMATORY CAUSES
- •TREATMENT
- •PHOTODYNAMIC THERAPY
- •SURGICAL THERAPY
- •ANTIANGIOGENIC THERAPY
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •INTRODUCTION
- •DISEASE INCIDENCE
- •RISK FACTORS
- •ETIOLOGY/PATHOGENESIS
- •SIGNS AND SYMPTOMS
- •OCULAR
- •SYSTEMIC
- •TREATMENT OPTIONS
- •SUMMARY AND KEY POINTS
- •ACKNOWLEDGMENTS
- •REFERENCES
- •Retinopathy of prematurity
- •INTRODUCTION
- •DISEASE PREVALENCE AND INFLUENCE
- •RISK FACTORS
- •ETIOLOGY/PATHOGENESIS
- •ABNORMAL RETINAL VASCULARIZATION IN ROP
- •ROLE OF GROWTH FACTORS IN ROP
- •DIAGNOSIS AND ANCILLARY TESTING/DIFFERENTIAL DIAGNOSIS
- •SIGNS AND SYMPTOMS
- •CLASSIFICATION OF RETINOPATHY OF PREMATURITY
- •TREATMENT OPTIONS FOR RETINOPATHY OF PREMATURITY
- •CRYOTHERAPY AND LASER THERAPY
- •INTRAVITREAL ANTI-VEGF THERAPY FOR ROP
- •Rationale for Treatment
- •Injection Technique
- •Patients
- •Results
- •Other Reported Results
- •Concerns with Intravitreal Anti-VEGF Therapy for ROP
- •Ocular complications
- •Systemic Complications
- •Vitrectomy
- •SUMMARY
- •REFERENCES
- •Idiopathic macular telangiectasia
- •INTRODUCTION
- •THERAPY
- •NONPROLIFERATIVE STAGE
- •PROLIFERATIVE STAGE
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •Neovascular glaucoma
- •INTRODUCTION
- •DISEASE PREVALENCE AND INFLUENCE
- •RISK FACTORS
- •ETIOLOGY/PATHOGENESIS
- •CENTRAL RETINAL VEIN OCCLUSION
- •DIABETIC RETINOPATHY
- •DIABETIC NEOVASCULAR GLAUCOMA
- •CAROTID ARTERY OCCLUSIVE DISEASE
- •CENTRAL RETINAL ARTERY OCCLUSION
- •INTRAOCULAR TUMORS
- •Malignant melanoma
- •Retinoblastoma
- •MISCELLANEOUS CAUSES
- •DIAGNOSIS AND ANCILLARY TESTING
- •DIFFERENTIAL DIAGNOSIS
- •SIGNS AND SYMPTOMS
- •TREATMENT OPTIONS
- •TREATMENT OF THE UNDERLYING DISEASE ASSOCIATED WITH NVG
- •Central retinal vein occlusion
- •Diabetic retinopathy
- •Carotid artery occlusive disease
- •Central retinal artery occlusion
- •PHARMACOLOGIC THERAPIES
- •Medical treatment to control high IOP
- •Anti-VEGF therapy
- •Corticosteroid therapy
- •Photodynamic therapy
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •INTRODUCTION
- •SPECIFIC DISEASES
- •RETINITIS PIGMENTOSA
- •Nutrients and retinitis pigmentosa
- •Cystoid Macular Edema (CME) associated with RP
- •Ciliary Neurotrophic Factor and retinitis pigmentosa
- •REFSUM’S DISEASE
- •Treatment
- •Dietary restriction
- •Plasmapheresis
- •GYRATE ATROPHY
- •Treatment
- •Arginine-restricted diet
- •Vitamin B6 supplementation
- •ABETALIPOPROTEINEMIA (BASSEN–KORNZWEIG SYNDROME)
- •Treatment
- •LEBER CONGENITAL AMAUROSIS
- •Treatment
- •RPE65 gene therapy
- •X-LINKED JUVENILE RETINOSCHISIS
- •Treatment
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •SECTION 4: Drugs and Mechanisms in Retinal Diseases
- •Nonsteroidal anti-inflammatory drugs (NSAIDs) in the treatment of retinal diseases
- •KEY FEATURES
- •INTRODUCTION AND HISTORY
- •PHARMACOLOGY, DRUG MECHANISM, AND EFFECTS
- •DICLOFENAC
- •KETOROLAC
- •NEVANAC
- •BROMFENAC
- •DICLOFENAC
- •KETOROLAC
- •NEPAFENAC
- •BROMFENAC
- •CONTRAINDICATIONS, COMPLICATIONS, AND TOXICITY
- •SUMMARY AND KEY POINTS
- •ACKNOWLEDGMENTS
- •REFERENCES
- •KEY FEATURES
- •INTRODUCTION
- •PHARMACOLOGY
- •STRUCTURE
- •METABOLISM
- •Dexamethasone
- •Fluocinolone
- •CYSTOID MACULAR EDEMA
- •DIABETIC MACULAR EDEMA
- •RETINAL VEIN OCCLUSION
- •EXUDATIVE AGE-RELATED MACULAR DEGENERATION (AMD)
- •Raised intraocular pressure
- •Infectious, sterile, and pseudoendophthalmitis associated with triamcinolone acetonide
- •Cataract
- •Retinal detachment
- •FUTURE CONSIDERATIONS AND ONGOING STUDIES
- •THE SCORE STUDY
- •STEROID-SUSTAINED RELEASE DEVICES
- •The STRIDE study
- •FLUOCINOLONE ACETONIDE DEVICE
- •NEW-GENERATION FLUOCINOLONE DEVICE
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •Anecortave acetate
- •KEY FEATURES
- •INTRODUCTION AND HISTORY
- •PHARMACOLOGY
- •DRUG MECHANISM
- •DRUG EFFECTS IN RETINAL DISEASES
- •PRECLINICAL STUDIES
- •Retinopathy of prematurity
- •Intraocular tumors
- •Choroidal neovascularization
- •CLINICAL STUDIES
- •Exudative AMD
- •Other diseases
- •EFFICACY AND COMPARISON WITH OTHER AGENTS
- •CONTRAINDICATIONS
- •OCULAR COMPLICATIONS AND TOXICITY
- •SYSTEMIC COMPLICATIONS AND TOXICITY
- •DRUG INTERACTIONS
- •SUMMARY AND KEY POINTS
- •ACKNOWLEDGMENTS
- •REFERENCES
- •KEY FEATURES
- •INTRODUCTION AND HISTORY
- •PHARMACOLOGY
- •DRUG MECHANISM
- •DRUG USE IN RETINAL DISEASES
- •AGE-RELATED MACULAR DEGENERATION
- •DIABETIC RETINOPATHY
- •RETINAL VEIN OCCLUSION (RVO)
- •UVEITIC CYSTOID MACULAR EDEMA (CME)
- •RETINOPATHY OF PREMATURITY (ROP)
- •RETINAL TELANGIECTASIAS
- •NEOVASCULAR GLAUCOMA (NVG)
- •OTHERS
- •CONTRAINDICATIONS
- •OCULAR COMPLICATIONS AND TOXICITY
- •SYSTEMIC COMPLICATION AND TOXICITY
- •DRUG INTERACTIONS
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •KEY FEATURES
- •INTRODUCTION AND HISTORY
- •PHARMACOLOGY
- •PHARMACOLOGICAL DESIGN
- •PHARMACOKINETICS
- •PHARMACODYNAMICS
- •DRUG MECHANISM
- •DRUG USE IN RETINAL DISEASES
- •EFFICACY
- •EFFICACY IN AMD
- •EFFICACY IN OTHER RETINAL DISEASES
- •CONTRAINDICATIONS
- •OCULAR COMPLICATIONS AND TOXICITY
- •DRUG INTERACTIONS
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •Pathophysiology of vascular endothelial growth factor and other angiogenic molecules
- •KEY FEATURES
- •INTRODUCTION
- •BIOLOGICAL EFFECTS OF VEGF-A
- •VEGF-A ISOFORMS
- •VEGF RECEPTORS
- •ROLE OF VEGF-A IN INTRAOCULAR NEOVASCULAR SYNDROMES
- •INTRAVITREAL ANTI-VEGF THERAPY FOR NEOVASCULAR AMD: PEGAPTANIB, RANIBIZUMAB AND BEVACIZUMAB
- •OTHER ANTI-VEGF THERAPIES IN CLINICAL DEVELOPMENT FOR AMD
- •OTHER ANGIOGENIC FACTORS
- •FIBROBLAST GROWTH FACTOR FAMILY
- •PLACENTAL GROWTH FACTOR
- •DELTA-LIKE LIGAND 4
- •SUMMARY AND KEYPOINTS
- •REFERENCES
- •KEY FEATURES
- •INTRODUCTION
- •TUMOR NECROSIS FACTOR-ALPHA ANTAGONISTS
- •INFLIXIMAB (REMICADE)
- •Pharmacology and mechanism
- •Systemic indications for infliximab
- •Ophthalmic indications for infliximab
- •Contraindications
- •Ocular complications and toxicity
- •Systemic complications and toxicity
- •Drug interactions
- •Summary
- •ADALIMUMAB (HUMIRA)
- •Pharmacology and mechanism
- •Systemic indications
- •Ophthalmic indications
- •Contraindications
- •Ocular toxicity
- •Systemic toxicity
- •Drug interactions
- •Summary
- •ETANERCEPT (ENBREL)
- •Pharmacology and mechanism
- •Systemic indications
- •Ophthalmic indications
- •Contraindications
- •Ocular toxicity
- •Systemic toxicity
- •Drug interactions
- •Summary
- •INTERLEUKIN-2 RECEPTOR ANTAGONIST
- •DACLIZUMAB (ZENAPAX)
- •Pharmacology and mechanism
- •Systemic indication
- •Ophthalmic indications
- •Contraindications
- •Ocular toxicity
- •Systemic toxicity
- •Drug interactions
- •Summary
- •OTHER BIOLOGIC AGENTS
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •KEY FEATURES
- •CALCINEURIN INHIBITORS
- •CICLOSPORIN (CYCLOSPORIN: CsA)
- •Key features, introduction, and history
- •Pharmacology
- •Drug effects in human nonocular diseases
- •Drug use in retinal diseases
- •Pediatric case series
- •EFFICACY AND COMPARISON WITH OTHER AGENTS
- •Ciclosporin versus tacrolimus
- •TACROLIMUS
- •Key features, introduction, and history
- •Pharmacology
- •Drug effects in human nonocular diseases
- •Drug use in retinal diseases
- •Summary and key points
- •ANTIMETABOLITES
- •MYCOPHENOLATE MOFETIL (MMF)
- •Key features, introduction, and history
- •Pharmacology
- •Drug mechanism
- •Drug effects in human nonocular diseases
- •Drug use in retinal diseases
- •Pediatric case series
- •METHOTREXATE
- •Key features, introduction, and history
- •Pharmacology
- •Drug mechanism
- •Drug effects in human nonocular diseases
- •Drug use in retinal diseases
- •Pediatric case series
- •Intravitreal methotrexate injection
- •AZATHIOPRINE
- •Key features, introduction, and history
- •Pharmacology
- •Drug mechanism
- •Drug effects in human nonocular diseases
- •Drug use in retinal diseases
- •Pediatric case series
- •Summary and key points
- •ALKYLATING AGENTS
- •CYCLOPHOSPHAMIDE
- •Key features, introduction, and history
- •Pharmacology
- •Drug effects in human nonocular diseases
- •Drug use in retinal diseases
- •Efficacy and comparison with other agents
- •CHLORAMBUCIL
- •Key features, introduction, and history
- •Pharmacology
- •Drug effects in human nonocular diseases
- •Drug use in retinal diseases
- •Efficacy and comparison with other agents
- •Summary and key points
- •SUMMARY
- •REFERENCES
- •KEY FEATURES
- •INTRODUCTION AND HISTORY
- •PHARMACOLOGY
- •DRUG MECHANISM
- •DRUG EFFECTS IN PRECLINICAL MODELS
- •SYSTEMIC AND OCULAR COMPLICATIONS AND TOXICITY
- •BIOACTIVITY IN HUMAN EYE DISEASES
- •NEOVASCULAR AMD PHASE I
- •NEOVASCULAR AMD PHASE III PROGRAM
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •KEY FEATURES
- •INTRODUCTION AND HISTORY
- •PHARMACOLOGY
- •PHARMACOKINETICS
- •DRUG MECHANISM
- •DRUG USE IN RETINAL DISEASES
- •DIABETIC RETINOPATHY
- •RETINAL VEIN OCCLUSION
- •OTHERS
- •CONTRAINDICATIONS
- •OCULAR COMPLICATIONS AND TOXICITY
- •DRUG INTERACTIONS
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •KEY FEATURES
- •INTRODUCTION TO PROTEIN KINASE C
- •PROTEIN KINASE C FAMILY
- •EFFECTS OF ACTIVATED PKC
- •PHARMACOLOGY OF RUBOXISTAURIN
- •EFFECT OF RUBOXISTAURIN IN HUMAN NONOCULAR DISEASES
- •Use of PKC Inhibitors in the treatment of diabetic macular edema and diabetic retinopathy
- •EFFICACY OF RUBOXISTAURIN IN THE TREATMENT OF DIABETIC RETINOPATHY
- •OCULAR AND SYSTEMIC COMPLICATIONS AND TOXICITY OF RUBOXISTAURIN
- •INTERACTION OF RUBOXISTAURIN WITH OTHER DRUGS
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •KEY FEATURES
- •INTRODUCTION AND HISTORY OF SIRNA FOR RETINAL DISEASES
- •PHARMACOLOGY, DRUG MECHANISM, AND DRUG EFFECTS IN NONOCULAR DISEASES
- •DRUG USES IN RETINAL DISEASES
- •BEVASIRANIB FOR SUBFOVEAL CHOROIDAL NEOVASCULARIZATION
- •BEVASIRANIB FOR NEOVASCULAR MACULAR DEGENERATION: RESULTS
- •BEVASIRANIB FOR THE TREATMENT OF DIABETIC MACULAR EDEMA (DME)
- •SIRNA-027 FOR SUBFOVEAL CHOROIDAL NEOVASCULARIZATION
- •REDD14 NP
- •SUMMARY AND KEY POINTS
- •ACKNOWLEDGMENT
- •REFERENCES
- •Ocular gene therapy
- •KEY FEATURES
- •INTRODUCTION TO GENE THERAPY
- •CURRENT VIRAL VECTORS
- •VIRAL VECTOR-ASSOCIATED RISKS
- •VIRAL VERSUS NONVIRAL VECTORS
- •STRATEGIES FOR RECESSIVE VERSUS DOMINANT DISEASE
- •STRATEGIES FOR PROLIFERATIVE AND NEOPLASTIC OCULAR DISEASE
- •RETINOBLASTOMA GENE THERAPY CLINICAL TRIAL
- •GENE THERAPY FOR LEBER’S CONGENITAL AMAUROSIS TRIAL
- •SUMMARY AND KEYPOINTS: THE FUTURE OF GENE THERAPY
- •REFERENCES
- •KEY FEATURES
- •INTRODUCTION
- •MECHANISM OF PROTECTION: APPROACHES AND CHALLENGES
- •ANTIOXIDATIVE THERAPY
- •EXCITOTOXICITY
- •NEUROTROPHIC FACTORS
- •ANTIAPOPTOPIC THERAPY
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •KEY FEATURES
- •INTRODUCTION AND HISTORY
- •PHARMACOLOGY
- •DRUG MECHANISM
- •PDT IN ONCOLOGICAL DISORDERS
- •PDT IN IMMUNE (NONONCOLOGICAL) DISORDERS
- •DRUG USE IN RETINAL DISEASES
- •AGE-RELATED MACULAR DEGENERATION
- •PATHOLOGIC MYOPIA
- •OTHER SUBFOVEAL AND JUXTAFOVEAL POSTINFLAMMATORY OR IDIOPATHIC CHOROIDAL NEOVASCULARIZATION
- •POLYPOIDAL CHOROIDAL VASCULOPATHY
- •CENTRAL SEROUS CHORIORETINOPATHY
- •INTRAOCULAR VASOPROLIFERATIVE TUMORS
- •RETINAL ASTROCYTOMA
- •CHOROIDAL OSTEOMA
- •CHOROIDAL MELANOMA
- •RETINOBLASTOMA
- •CONJUNCTIVAL IN SITU SQUAMOUS CELL CARCINOMA
- •EFFICACY AND COMPARISON WITH OTHER AGENTS
- •CONTRAINDICATIONS
- •OCULAR COMPLICATIONS AND TOXICITY
- •DRUG INTERACTIONS
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •KEY FEATURES
- •INTRODUCTION
- •RETINOBLASTOMA (Tables 44.1 and 44.2)
- •GENERAL CONSIDERATIONS
- •CHEMOREDUCTION
- •AGENTS
- •RESULTS
- •CHEMOREDUCTION FAILURE
- •SIDE-EFFECTS
- •CHEMOTHERMOTHERAPY
- •PERIOCULAR AND SUBCONJUNCTIVAL CHEMOTHERAPY
- •INTRAVITREAL CHEMOTHERAPY
- •INTRA-ARTERIAL CHEMOTHERAPY
- •ADJUVANT CHEMOTHERAPY
- •NO CHOROIDAL, SCLERAL, OR POSTLAMINAR OPTIC NERVE INVOLVEMENT
- •CHOROIDAL INVASION
- •POSTLAMINAR OPTIC NERVE INVASION
- •TUMOR AT CUT OPTIC NERVE MARGIN
- •METASTATIC RETINOBLASTOMA
- •UVEAL METASTASIS
- •GENERAL CONSIDERATIONS
- •CHEMOTHERAPY
- •PROGNOSIS
- •UVEAL MELANOMA
- •METASTATIC UVEAL MELANOMA
- •INTRAOCULAR LYMPHOMA
- •GENERAL CONSIDERATIONS
- •TREATMENT
- •SUMMARY AND KEYPOINTS
- •REFERENCES
- •Antibiotics
- •INTRODUCTION
- •POTENTIAL NEW TREATMENT REGIMENS
- •TOPICAL FLUOROQUINOLONES
- •ORAL AND INTRAVENOUS ANTIBIOTICS
- •NASALLY APPLIED ANTIBIOTICS
- •ORAL, TOPICAL, AND INTRAVITREAL ANTIFUNGAL AGENTS
- •CONCLUSION
- •REFERENCES
- •SECTION 5: Pharmacotherapy and Surgery
- •KEY FEATURES (PHARMACOLOGY)
- •INTRODUCTION AND HISTORY
- •RHEOPHERESIS IN RETINAL DISEASES
- •AGE-RELATED MACULAR DEGENERATION
- •MAC-1 trial
- •Multicenter investigation of rheopheresis for AMD (MIRA-1)
- •DIABETIC MACULOPATHY
- •CENTRAL RETINAL VEIN OCCLUSION
- •UVEAL EFFUSION SYNDROME
- •Complications
- •SUMMARY
- •REFERENCES
- •Enzymatic vitrectomy and pharmacologic vitreodynamics
- •INTRODUCTION AND HISTORY
- •PHARMACOLOGY AND BIOCHEMISTRY
- •INDICATIONS
- •SURGICAL ADJUNCT
- •NONSURGICAL INDICATIONS
- •OPERATIVE TECHNIQUES
- •OUTCOMES
- •SUMMARY
- •REFERENCES
- •KEY FEATURES, INTRODUCTION, AND HISTORY
- •RATIONALE
- •PHARMACOLOGY AND BIOCHEMISTRY
- •INDICATIONS, OUTCOMES, AND COMPLICATIONS – VITAL DYES IN CHROMOVITRECTOMY
- •INDOCYANINE GREEN
- •INFRACYANINE GREEN
- •TRYPAN BLUE
- •PATENT BLUE
- •BRILLIANT BLUE
- •SODIUM FLUORESCEIN (SF)
- •TRIAMCINOLONE ACETONIDE
- •DYE INJECTION
- •MACULAR HOLE PROTECTION
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •KEY FEATURES
- •INTRODUCTION AND HISTORY
- •BIOLOGICAL EFFECTS
- •INDICATIONS
- •CHOROIDAL MELANOMA
- •OTHER OCULAR TUMORS
- •OPERATIVE TECHNIQUES
- •PLAQUE PLACEMENT TECHNIQUE
- •EPIMACULAR BRACHYTHERAPY FOR AGE-RELATED MACULAR DEGENERATION
- •SURGICAL TECHNIQUE
- •OUTCOMES
- •CHOROIDAL MELANOMA
- •BRACHYTHERAPY FOR AGE-RELATED MACULAR DEGENERATION
- •COMPLICATIONS
- •RADIATION RETINOPATHY
- •OPTIC NEUROPATHY
- •LENS TOXICITY
- •SCLERA/CHOROID TOXICITY
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •INTRODUCTION
- •RPE DISEASE AND INDICATIONS FOR TREATMENT BY TRANSPLANTATION
- •BRUCH’S MEMBRANE AS A SUBSTRATE FOR TRANSPLANTED RPE
- •HISTORICAL DEVELOPMENT OF RPE TREATMENT
- •AUTOLOGOUS TREATMENT
- •IRIS PIGMENT EPITHELIUM
- •RETINAL PIGMENT EPITHELIUM
- •Suspension
- •RPE-BM Choroid Sheet
- •TISSUE ENGINEERING AND RPE REPLACEMENT STRATEGIES
- •PROSTHESIS OR TISSUE ENGINEERING OF BRUCH’S MEMBRANE
- •STEM CELLS
- •Embryonic stem cells
- •Bone marrow-derived cells
- •MANAGING DECONSTRUCTIVE REACTIONS INDUCED BY RETINAL DETACHMENT
- •CONCLUSIONS AND FUTURE DIRECTIONS
- •ACKNOWLEDGMENTS
- •REFERENCES
- •SECTION 6: The Last Words
- •Off-label drugs and the impact of the Food and Drug Administration in the treatment of retinal disease
- •INTRODUCTION
- •OFF-LABEL DRUG USAGE AND THE FOOD AND DRUG ADMINISTRATION
- •HISTORICAL PERSPECTIVES
- •FDA APPROVAL PROCESS
- •THE CONCEPT OF “OFF-LABEL”
- •“INVESTIGATIONAL USAGE OF DRUGS”
- •COMPOUNDING PHARMACIES
- •RISK MANAGEMENT ISSUES
- •INFORMED CONSENT
- •MEDICAL PAYMENT/COVERAGE
- •NATIONAL COVERAGE DETERMINATION
- •CLINICAL TRIALS
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •INTRODUCTION
- •HISTORY
- •KEY CONCEPTS
- •EVIDENCE-BASED MEDICINE
- •TYPES OF PHARMACOECONOMIC ANALYSIS
- •COST MINIMIZATION ANALYSIS
- •COST–BENEFIT ANALYSIS
- •COST-EFFECTIVENESS ANALYSIS
- •Cost-effectiveness analysis
- •COST–UTILITY ANALYSIS
- •Quality of life: Function-based instruments
- •Quality of life: Preference-based instruments
- •Utility gain
- •Value gain
- •Value trumps cost
- •Cost–utility ratio
- •Cost-effectiveness standards
- •Discounting5
- •Value-based medicine
- •Standardization
- •Patient respondents
- •COST PERSPECTIVE
- •SUMMARY AND KEY POINTS
- •REFERENCES
- •Future perspectives:
- •INTRODUCTION
- •KEY FEATURES
- •ANGIOGENESIS AND NEOVASCULAR AGE-RELATED MACULAR DEGENERATION
- •TYROSINE KINASE INHIBITORS
- •PDGF INHIBITORS
- •INTEGRIN INHIBITORS
- •SMALL INTERFERING RNA
- •BIOACTIVE LIPIDS
- •NONNEOVASCULAR AGE-RELATED MACULAR DEGENERATION
- •COMPLEMENT INHIBITORS
- •DIABETIC MACULAR EDEMA
- •INHIBITION OF INFLAMMATION
- •SUMMARY AND KEY POINTS
- •ACKNOWLEDGMENT
- •REFERENCES
- •Index
Molecules Angiogenic Other and Factor Growth Endothelial Vascular of Pathophysiology• 34 chapter
larger percentage of subjects treated with ranibizumab gained 15 letters at 1 year than did the verteporfin PDT group. Most recently, a 2-year analysis of the ANCHOR trial has been published and shows that ranibizumab provided greater clinical benefit than verteporfin PDT in patients with AMD with new-onset, predominantly classic CNV.84
Encouraging ranibizumab (Lucentis) preliminary phase III clinical trial results have led to growing interest in the possibility of off-label use of bevacizumab (Avastin) as a therapeutic option for the treatment of neovascular AMD85–87 (for recent reviews, see Andreoli and Miller,77 Jager et al.,78 and Pieramici and Rabena79). Systemic bevacizumab has been the subject of numerous open-label uncontrolled trials showing short-term benefits. These reports are difficult to compare with rigorous, double-masked, controlled phase III data reported for verteporfin PDT, pegaptanib, and ranibizumab.88 Nevetheless, bevacizumab is widely used worldwide. A phase III study comparing ranibizumab and bevacizumab is ongoing.
OTHER ANTI-VEGF THERAPIES IN CLINICAL DEVELOPMENT FOR AMD
Anumber of other molecules targeting VEGF and its signaling pathway are in early stages of clinical development for the treatment of neovascular AMD. The VEGF-Trap38 was initially tested by the systemic route of administration, but the occurrence of hypertension and proteinuria led to discontinuation of these studies89,90 The VEGF-Trap is currently administered intravitreally and is being investigated in phase III clinical trials for neovascular AMD and phase II for diabetic macular edema. Cand5 and Sirna-027 are short interfering RNA molecules that inhibit the expression of genes encoding VEGF and VEGF receptor 1, respectively.91,92 While not being developed for neovascular AMD, ruboxistaurin (LY333531) is an oral protein kinase C-beta inhibitor that is being developed for diabetic retinopathy.93
patients treated with agents targeting the VEGF–VEGFR2 pathway.97,100 This observation led to the speculation that PlGF may be involved in providing an escape pathway when VEGF-A is inhibited. Using an anti-PlGF neutralizing antibody, Fischer et al. reported that inhibition of PlGF signaling slows tumor growth and inhibits metastasis in multiple murine models.101 However, the role of PlGF in tumor angiogenesis and growth remains controversial. In a preclinical study employing sunitinib, a VEGFR2 small-molecule inhibitor, Ebos et al.102 found that PlGF was up-regulated in nontumor-bearing mice, suggesting a non- tumor-specific host response to the treatment. Moreover, a high-affinity chimeric soluble VEGFR1 variant, mFlt (1-3)-IgG, which simultaneously blocks VEGF-A, B, and PlGF, performed comparably to an anti- VEGF-A antibody alone in inhibiting tumor growth.103 Similarly, an anti-VEGFR1 antibody did not inhibit tumor angiogenesis or tumor growth in the Rip-Tag model, nor did it add benefits when combined with anti-VEGFR2 antibodies.96 Further studies are necessary to investigate the role of PlGF in tumor and other types of pathological angiogenesis.
DELTA-LIKE LIGAND 4
Dll4 belongs to the Delta/Jagged family of transmembrane ligands that binds to Notch receptors.104 Delta-Notch signaling mediates cell–cell communication and regulates cell fate determination. Like the VEGF pathway, Delta/Notch signaling is also critically important for proper vascular development.104 One particular endothelial cell notch ligand, Dll4, was required for properly regulating tip cell formation during angiogenesis.105 Activation of Dll/Notch pathway decreased tip cell numbers. Conversely, reduced Dll4 signaling increased tip cell formation. Up-regulation of Dll4 was also found in tumor vessels.106 Two groups demonstrated independently that inhibiting Dll4 with an antibody or a Dll4-fc inhibits tumor growth by deregulating angiogenesis, resulting in increased, but nonfunctional, vessels.107,108
OTHER ANGIOGENIC FACTORS
FIBROBLAST GROWTH FACTOR FAMILY
The FGF family has been implicated in a wide variety of important processes such as neurogenesis, organ development, and angiogenesis and includes 18 ligands interacting with four receptors.94 While the prototype members, FGF-1 and FGF-2, are devoid of a signal peptide and thus are poorly secreted proteins,95 most members of the family are efficiently secreted.94 Using the Rip-Tag model, Casanovas et al. found that FGF-1 and FGF-2 are up-regulated in tumors that relapsed following anti-VEGFR antibody (DC101) treatment.96 Moreover, their expression correlated with the restoration of tumor vasculature that initially regressed during the responsive phase to anti-VEGFR therapy. To assess the functional importance of FGF in the regrowth of tumor vessels and relapse of tumor growth, the authors treated mice with a FGF-trap (FGFR-Fc fusion peptide) when tumors were in a maximum response phase to VEGFR inhibitors.96 The combinatorial treatment resulted in slowed tumor growth and attenuated tumor angiogenesis, indicating that FGF signaling is required for tumor regrowth in the presence of VEGFR inhibitors. Similarly, FGF-2 increases were also found in the blood of patients relapsed from treatment using VEGFR inhibitors,97 suggesting that FGF-2 may be responsible for the acquired resistance observed in patients. Conceivably, tumor cells that express high levels of FGF-2 prior to treatment are likely to be intrinsically resistant to VEGF or VEGFR inhibitors.
PLACENTAL GROWTH FACTOR
PlGF is a member of the VEGF family that binds specifically to VEGFR1.39,98 While PlGF null mice are viable and fertile, they have been reported to have reduced angiogenesis during pathological conditions.99 Up-regulation of both VEGF and PlGF has been reported in
SUMMARY AND KEYPOINTS
Research conducted for almost two decades has demonstrated that VEGF-A is important for the regulation of the normal angiogenesis processes. Moreover, VEGF inhibition has been shown to suppress pathological angiogenesis in a variety of cancer models, leading to the clinical development of a variety of VEGF inhibitors. Definitive clinical studies have proved that VEGF inhibition, by means of bevacizumab in combination with chemotherapy, provides a significant clinical benefit in patients with metastatic colorectal cancer, nonsmall-cell lung carcinoma, and metastatic breast cancer, in combination with cytotoxic chemotherapy.109–112 Furthermore, two small molecule tyrosine kinase inhibitors, sunitinib113 and sorafenib,114 have been approved by the FDA for metastatic renal cell carcinoma and their mechanism of tumor suppression consists, at least partly, in inhibition of VEGF signaling.62–64
A particularly active area of research concerns the elucidation of the mechanisms of refractoriness or resistance to anti-VEGF therapies. Tumor cell-intrinsic or treatment-induced expression of angiogenic factors may be implicated.96,115 Recent studies have provided evidence that, at least in some murine models, refractoriness to anti-VEGF therapy is related to the ability of the tumor to recruit CD11b+Gr1+ myeloid cells, which in turn promotes angiogenesis.103 Subsequent studies indicated that a secreted protein called Bv8 or prokineticin-2 is a mediator of myeloid cell-dependent angiogenesis.116–118 It remains to be established whether these findings also apply to human tumors and other pathological conditions. In this context, it is noteworthy that myeloid cell infiltration has also been implicated in CNV.119
Reliable markers are needed to monitor the activity of antiangiogenic drugs. Circulating endothelial cells and their progenitor subset are a potential candidate, as is magnetic resonance imaging dynamic measurement of vascular permeability/flow in response to angiogenesis inhibitors, but neither has been clinically validated.63 Emphasizing the difficulty of identifying predictive markers, a recent study found that
232
VEGF-A and thrombospondin expression or microvessel density in tumor sections does not correlate with clinical response to bevacizumab in patients with metastatic colorectal cancer and patients showed a survival benefit from the treatment, irrespective of these parameters.120
VEGF inhibitors have demonstrated a marked clinical benefit also in neovascular AMD. Blockade of all VEGF-A isoforms and bioactive fragmemts with ranibizumab not only slowed down vision loss, but, unexpectedly, appears to have the potential to enable many AMD patients to obtain a meaningful and sustained gain of vision. Current work is testing the hypothesis that VEGF blockade may be beneficial for other conditions such as macular edema associated with diabetic retinopathy and retinal vein occlusion.121,122 Furthermore, ongoing work is attempting to identify strategies to augment the efficacy of VEGF pathway inhibitors. In this context, recent studies suggest that blocking PDGF-β may have the added benefit of inhibiting fibrosis.123
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Molecules Angiogenic Other and Factor Growth Endothelial Vascular of Pathophysiology• 34 chapter
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