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Файл:Ординатура / Хирургия / Библиотека им академика М.И. Перельмана / Книга_5398_Библиотеки_им_академика_М_И_Перельмана.pdf
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- •Preface
- •Contents
- •Contributors
- •1. Introduction
- •2. The Initial Phase of Drug Delivery Systems
- •3. Recent Drug Delivery Systems
- •4. Drug Delivery via Carriers
- •5.4 Polymer-Lipid Hybrid Nanoparticles Drug Delivery System
- •5.5 Self-Micro Emulsifying Drug Delivery System
- •5.6 In Situ Gel Drug Delivery System
- •5.8 Targeted Drug Delivery
- •6. Ceramic-Based Drug Delivery System
- •7. Polysaccharide-Based Drug Delivery System
- •8. Closed Loop Insulin Delivery System
- •9. Liposome-Mediated Drug Delivery
- •5. Recent Drug Delivery Systems
- •5.3 Hexagonal Boron Nitride Nanosheet Drug Delivery System
- •10. Dendrimers
- •11. PEGylated Drug Delivery System
- •12. Antibody-Drug Conjugate System
- •13. Mesoporous Silica-Based Drug Delivery
- •14. Transdermal Drug Delivery System
- •15. Hydrogel-Mediated Ocular Drug Delivery
- •16. Challenges with Current Drug Delivery Systems
- •17. Future Direction and Conclusion
- •References
- •1. Introduction
- •2. Pharmacokinetic Principles
- •2.1 Application of the Pharmacokinetic Principle in the Biomedical Fields
- •3. Cell Membrane/Biological Membrane
- •3.1 Passage of Drugs Across Biological Membranes
- •3.1.1 Simple Transport
- •3.1.2 Specialized Transport
- •4. Routes of Drug Administration
- •4.1 Oral (Enteral) Versus Parenteral Administration
- •4.2 Various Routes of Drug Administration
- •5. Absorption
- •5.1 Factors Affecting Absorption of Drugs
- •5.1.1 Physio-chemical Characteristics
- •5.1.2 Dosage Form
- •5.1.3 Concentration and Volume
- •5.1.4 Blood Flow
- •5.1.5 Surface Area
- •5.1.6 Administration Route
- •5.1.7 Disease States
- •5.2 Gastrointestinal Tract
- •5.3 Parenteral Sites
- •5.4 Pulmonary Sites (Alveoli)
- •5.5 Topical Sites
- •6. Distribution
- •6.1 Factors Affecting Distribution of Drugs
- •6.1.1 Physicochemical Properties of the Drug
- •6.1.2 Binding to Plasma and Tissue Proteins
- •6.1.3 Blood Flow and Organ Size
- •6.1.4 Specialized Compartments and Barriers
- •6.1.5 Specialized Transport Systems
- •6.1.6 Disease States
- •6.1.7 Physiological Factors
- •7. Metabolism/Biotransformation
- •7.1 Functions of Metabolism
- •7.2 Sites of Metabolism
- •7.3.1 Microsomal Enzymes
- •7.3.2 Non-microsomal Enzymes
- •7.4 Pathways of Biotransformation
- •8. Excretion
- •8.1 Routes of Excretion
- •8.1.1 Renal Excretion of Drugs
- •8.1.2 Extra-Renal Excretion of Drugs
- •9.1 Minimum Effective Concentration (MEC)
- •9.2 Maximum Safe Concentration (MSC) or Minimum Toxic Concentration (MTC)
- •9.4 Area Under the Curve (AUC)
- •9.5 Peak Effect
- •9.7 Onset of Action
- •9.8 Onset Time
- •9.9 Duration of Action
- •10. Order of Pharmacokinetic Processes
- •10.1 Zero-Order Kinetics
- •10.2 First-Order Kinetics
- •10.3 Mixed-Order Kinetics
- •11. Pharmacokinetic Models
- •11.1 Compartmental Models
- •11.3 Physiological Models
- •12. Determinants of Pharmacokinetics
- •12.1 Absorption
- •12.1.1 Bioavailability
- •12.1.2 Bioequivalence
- •12.1.3 Area Under Curve (AUC)
- •12.2 Distribution
- •12.2.1 Volume of Distribution
- •12.3 Elimination
- •12.3.2 Clearance (Cl) or Body Clearance
- •13. Conclusion
- •References
- •1. Introduction
- •2. Principles of Targeted Drug Delivery
- •3.1 Changes in pH and Salt Development
- •3.7 Dendrimers
- •4.1 Small-Sized Molecule-Based Targeting Strategies
- •4.2 Nucleic Acid Fragment-Based Targeting Strategies
- •4.3 Peptide- and Antibody-Based Targeting Strategies
- •4.4 Cell-Based Targeting Strategies
- •5. Conclusion
- •References
- •3.4 Liposomes
- •3.5 Solid Lipid Nanoparticles
- •3.6 Co-crystal Preparation
- •1. Introduction
- •2. History
- •3.1 Organic Nanoparticles
- •3.2 Inorganic Nanoparticles
- •4. Nanotechnology-Based Drug Delivery Systems
- •4.1 Smart Drug Delivery Systems
- •4.3 Multifunctional Drug Carriers
- •4.4 Organic/Inorganic Composites
- •5. Nanoparticulate Drug Delivery Systems
- •5.1 Liposomes
- •5.2 Microemulsions
- •5.3 Nanoparticles
- •6. Applications
- •6.1 Enhanced Drug Delivery
- •6.2 Overcoming Biological Barriers
- •6.3 Controlled Drug Release
- •6.4 Combination Therapy
- •6.5 Personalized Medicine
- •7. Limitations
- •7.1 Complexity and Cost
- •7.2 Biocompatibility and Toxicity
- •7.3 Stability and Shelf Life
- •7.4 Drug Loading and Release
- •7.5 Biological Barriers and Clearance
- •8. Conclusions
- •References
- •1. Introduction
- •2. Guidelines for Design of Lipid-Based Formulations
- •3. Formulation Strategies
- •3.1 Lipid Nanoparticles
- •3.1.1 Solid Lipid Nanoparticles (SLNs)
- •3.1.2 Nanostructured Lipid Carriers (NLCs)
- •3.2 Liposomes
- •3.2.1 Conventional Liposomes
- •3.2.2 PEGylated Liposomes
- •3.2.3 Multifunctional Liposomes
- •3.3 Microemulsions and Self-micro Emulsifying Drug Delivery Systems (SMEDDS)
- •3.4 Hybrid Systems
- •3.4.1 Lipid-Polymer Hybrid Nanoparticles
- •3.4.2 Lipid-Protein Hybrid Systems
- •4. Advanced Characterization Methods
- •4.1 In Vitro and In Vivo Assessment
- •4.1.1 Dissolution Studies
- •4.1.2 Permeability Studies
- •4.2 Imaging Techniques
- •4.2.1 Electron Microscopy
- •4.2.2 Fluorescence Imaging
- •Fluorescent Probes
- •Confocal Microscopy
- •4.2.3 Magnetic Resonance Imaging (MRI)
- •4.3 Stability Studies
- •4.3.1 Oxidative Stability
- •4.3.2 Thermal Stability
- •5. Applications of Lipid-Based Drug Delivery Systems
- •5.1 Cancer Therapy
- •5.1.1 Targeted Drug Delivery
- •5.1.2 Combination Therapy
- •5.2 Central Nervous System Disorders
- •5.2.2 Neuroprotective Effects
- •5.3 Antiviral and Antimicrobial Applications
- •5.3.1 Lipid Nanoparticles for Antiviral Drugs
- •5.3.2 Antibiotic Delivery Systems
- •6. Future Perspectives and Challenges
- •7. Conclusion
- •References
- •1. Introduction
- •3. Design and Characterization of Polymeric Drug Delivery Systems
- •4. Responsive Polymers
- •4.1 Polymeric Hydrogels
- •4.1.1 Characterization of Polymeric Hydrogels
- •Structural Analysis
- •Functional Analysis
- •4.2 Polymeric Micelles
- •4.2.1 Characterization of Polymeric Micelle
- •Critical Micelle Concentration Determination (CMC)
- •Morphological Characterization
- •Physicochemical Characterization
- •4.3 Liposomes
- •4.3.1 Ethosome
- •4.3.2 Transferosome
- •4.3.3 Niosome
- •4.4 Polyplexes or Polymer-Drug Conjugates
- •4.4.1 Dendrimers
- •4.4.2 Polymer-Protein Conjugates
- •4.4.3 Polymeric Nanoparticles
- •5. Conclusion
- •6. Future Prospects
- •References
- •1. Introduction
- •2.1 Types of Stimuli
- •3. Mechanism of Stimuli Responsiveness
- •3.1 pH-Responsive Systems
- •4. Materials
- •4.1 pH-Responsive Materials
- •4.4 Synthetic Thermo-Responsive Materials
- •4.7 Magnetic Responsive Materials
- •4.8.1 Intrinsically Conducting Polymers
- •4.8.2 Hydrogels
- •5. Methods
- •5.1 pH-Responsive Drug Delivery Systems
- •6. Conclusion
- •7. Notes
- •References
- •1. Introduction
- •3. Basic Features Required for the Biomaterial
- •4. Characteristics of Biomaterials
- •6. Biocompatibility as the Crucial Item
- •7. Biomaterials in Drug Delivery
- •8. Controlled Drug Delivery
- •9. Clinical Need for Controlled Drug Delivery
- •10. Biomaterials for Controlled Release of Small Molecules
- •11. Bioresponsive Polymers: From Design to Implementation
- •11.3 Hydrolysis and Enzymatically Responsive Polymers
- •11.7 Swelling and Contracting Polymers
- •12. Transdermal Drug Delivery Systems
- •12.1 Barriers to Transdermal Delivery
- •12.2 Development of Transdermal Drug Delivery Patches
- •12.3 Hydrogels Versus Non-hydrogel Polymeric Patches
- •12.4 Patches Based on Biopolymers
- •12.5 Patches Based on Synthetic Polymers
- •12.6 Drug Particles/Carriers
- •12.7 Commercial Patches
- •13. Smart Biomaterials
- •14. Conclusion and Future Perspective
- •References
- •1. Introduction
- •1.1 Historical Evolution
- •2. Skin Anatomy and Physiology
- •2.1 Cutaneous Layer Organization
- •2.2 Cutaneous Barrier Function
- •3. Mechanisms of Transdermal Drug Delivery
- •4. Formulation Strategies for Transdermal Drug Delivery
- •4.1 Drug Selection Criteria
- •4.2 Vehicle and Excipient Considerations
- •4.3 Permeation Enhancers
- •4.4 Transdermal Drug Delivery Technologies
- •5. Evaluation Methods for Transdermal Drug Delivery Systems
- •6. Applications of Transdermal Drug Delivery
- •6.1 Therapeutic Areas
- •6.2 Case Studies of Successful Transdermal Products
- •7. Regulatory Considerations and Approval Process
- •7.1 FDA Guidelines for Transdermal Drug Delivery Systems
- •7.2 Quality Control and Manufacturing Standards
- •7.3 Clinical Trial Requirements
- •8. Challenges and Future Perspectives
- •8.1 Overcoming Cutaneous Barrier Properties
- •8.2 Expanding the Range of Deliverable Drugs
- •8.3 Intelligent and Responsive Transdermal Systems
- •8.4 Integration with Other Drug Delivery Technologies
- •8.5 Conclusion
- •References
- •1. Background
- •2. Importance of the Tumor Microenvironment (TME) in Cancer Progression and Therapy
- •2.1 Components of the TME
- •2.2 Therapeutic Targeting of the TME
- •2.3 Impact of Standard Therapies on the TME
- •3. Tumor-Homing Peptides
- •3.1 Different Strategies for Targeting Peptides to Tumor Microenvironment
- •3.2 Applications and Development
- •3.3 Examples and Discoveries
- •4. Tumor Microenvironment Responsive Drug Delivery Systems (DDSS)
- •5. Nanoparticle-Based Smart Drug Delivery Systems
- •5.1.1 Endogenous Stimulus-Responsive Drug Delivery Systems (DDSs)
- •5.1.2 Exogenous Stimulus-Responsive DDSs
- •5.2.2 Dynamic Strategies for Tumor Targeting
- •6. Challenges and Opportunities for Targeted Delivery to Cancer Cells
- •7. Future Directions
- •8. Conclusions
- •References
- •1. Introduction
- •2. Materials
- •2.1 Types of Biosensors
- •2.1.2 Smart Polymers
- •2.1.3 Microfabricated Devices
- •2.2.1 Enzyme-Based Biosensors
- •2.2.2 Antibody-Based Biosensors
- •2.2.3 Aptamer-Based Biosensors
- •2.2.4 Whole-Cell-Based Biosensors
- •3. Methods
- •3.1 Approach Toward Designing Biosensors
- •3.1.1 Selection of the Analyte and Bioreceptors
- •3.1.2 Immobilization of Biosensors
- •3.1.3 Selection of Transducer
- •3.2 Green Biosensors
- •3.3 Challenges in Development of Biosensors-Based Drug Delivery Systems
- •References
- •1. Introduction
- •3. Ocular Barriers Hindering Absorption of Drugs
- •3.1 Precorneal Barriers
- •3.1.1 Tear Film, Tear Turnover, and Nasolacrimal Duct Drainage
- •3.1.3 Conjunctival and Scleral Barriers
- •3.2 Corneal Barrier
- •3.3 Blood-Ocular Barriers
- •4. Various Routes for Ocular Drug Delivery
- •4.1 Topical Administration
- •4.2 Subconjunctival Administration
- •4.3 Transscleral Administration
- •4.4 Intracameral Administration
- •4.5 Intravitreal Injections/Implants (IVIs)
- •4.6 Retrobulbar Administration
- •4.7 Systemic Administration
- •5. Nanotechnology-Based Ocular Drug Delivery Platforms
- •5.1 Nanoparticles (NPs)
- •5.1.1 Polymeric Nanoparticles (PNPs)
- •5.2 Nanomicelles
- •5.3 Nanoemulsions (NEs)
- •5.4 Nanosuspensions
- •5.5 Nanocrystals (NCs)
- •5.6 Liposomes
- •5.7 Microemulsions
- •5.8 Niosomes
- •5.10 Dendrimers
- •5.11 Nanowafers
- •5.12 Cubosomes
- •5.13 Bilosomes
- •5.14 Olaminosomes
- •5.15 Contact Lenses
- •5.16 Hydrogels
- •5.17 Microneedles (MNs)
- •6. Alternative Ocular Drug Delivery Approaches
- •6.1 Gene Therapy
- •6.1.1 Viral Vectors
- •6.1.2 Non-viral Vectors
- •6.1.3 Antisense Oligonucleotides (ASOs), RNAi, CRISPR-Cas9
- •6.2 Exosomes
- •6.3 Self-nano Emulsifying Drug Delivery Structures (SNEDDS)
- •7. Clinical Status of Nanotechnology-Based Ocular Drug Delivery Systems
- •8. Future Outlooks
- •References
- •1. Introduction
- •2. Anatomy and Physiology of GIT
- •2.1 Mouth and Esophagus
- •2.2 Stomach
- •2.3 Small Intestine
- •2.4 Ruminant Digestive System
- •3. Blood Supply
- •4. Nerve Supply
- •5. Challenges in GIT Drug Delivery
- •5.1 Acidic Environment of the Stomach
- •5.2 Alkaline pH of the Intestine
- •5.3 Variable GI Transit Times
- •6. Future Opportunities in GIT Drug Delivery
- •6.1.1 Targeted Delivery Systems
- •6.1.2 Ligand-Conjugated Nanoparticles
- •6.1.3 Liposomes
- •6.1.4 Solid Lipid Nanoparticles
- •6.2 Controlled Release Systems
- •6.2.1 Osmotic Pumps
- •6.2.2 Matrix Systems
- •6.3 Mucoadhesive Systems
- •6.3.1 Mucoadhesive Polymers
- •6.4 Absorption Enhancers
- •6.5 Tight Junction Modulators
- •6.6 Development of Prodrugs
- •7. Conclusion
- •References
- •1. Introduction
- •2. Anatomy and Physiology of the Respiratory System
- •3. Traditional Methods of Respiratory Drug Delivery
- •3.1 Metered-Dose Inhalers (MDIs)
- •3.2 Dry Powder Inhalers (DPIs)
- •3.3 Nebulizers
- •3.5 Improved Patient Compliance Through User-Friendly Devices
- •3.8 Enhanced Absorption by Overcoming Biological Barriers
- •3.9 Macromolecule Delivery Facilitation
- •3.10 Reduced Side Effects Through Improved Targeting
- •3.11 Formulation Challenges Addressed
- •3.12 Smart Technology Integration for Personalized Treatment
- •3.13 Environmental Sustainability Considerations
- •4. Novel Drug Delivery Approaches
- •4.2 Liposomal Formulations
- •5. Advanced Inhalation Devices
- •6. Targeted Drug Delivery Strategies
- •6.2 pH-Responsive Drug Release
- •7. Emerging Therapeutics for Respiratory Diseases
- •8.2 Combination Therapies
- •8.3 Prodrug Approaches
- •9. Personalized Medicine in Respiratory Drug Delivery
- •10. Future Perspectives and Emerging Technologies
- •10.1 3D-Printed Inhalers
- •11. Conclusion
- •References
- •1. Introduction
- •2. Delivery of Small Molecules
- •3. Drawbacks of Conventional Drug Delivery System
- •4. Factors Affecting Cardiovascular Drug Targeting System
- •4.1 Particle Shape
- •4.2 Particle Size
- •4.3 Particle Density
- •4.4 Flow Characteristics
- •5. Various Targeted Drug Delivery Systems
- •5.1 Application of Exosomes and EVs (Extracellular Vesicles)
- •5.4 Nanomedicines in Cardiovascular Therapy
- •5.5 PLGA-Based Nanoparticles
- •5.6 Liposomal Delivery Systems
- •5.7 Delivery of Biologicals
- •5.8 RNA-Based Delivery
- •5.9 Therapeutic Proteins and Peptides
- •6. Future Perspectives and Challenges
- •7. Conclusion
- •References
- •1. Introduction
- •2. Materials
- •2.1 Equipment
- •2.2 Drugs
- •3. Methods
- •3.1.1 Extrusion-Based 3D Bioprinting
- •3.1.2 Inkjet 3D Bioprinting
- •3.1.3 Light-Based Bioprinting
- •3.1.4 Laser-Assisted Printing
- •3.2 Multiple Drug Delivery
- •3.2.1 Multilayer Films with Capsule-Integrated Polypeptide/Polyelectrolyte
- •3.2.2 Multilayer Shells Using Polypeptides/Polyelectrolytes (PL or PG) and LbL Assembly
- •3.3.1 Physical Stimulation-Responsive Drug Delivery Systems
- •3.3.4 Light-Responsive Drug Delivery Systems (LRDDS)
- •3.4 Small Molecule Delivery System
- •3.4.1 Intraarticular Delivery System
- •3.5 Gene Delivery System
- •3.6 Stem Cell Technology
- •4. Conclusion
- •References
- •1. Introduction
- •2. Importance of Targeted Drug Delivery to the Reproductive System
- •3. Challenges in Drug Delivery to the Reproductive System
- •4. Advances in Drug Delivery Systems
- •4.2 Liposomes
- •4.3 Hydrogels and Biodegradable Polymers
- •4.4 Injectable and Implantable Devices
- •4.5 Micro- and Nano-Needles
- •4.6 Spermbots
- •5.1 Vaginal and Cervical Delivery
- •5.2 Uterine and Intrauterine Delivery
- •5.3 Penile and Testicular Delivery
- •6. Targeted and Precision Medicine Approaches
- •6.1 Hormone Replacement Therapy (HRT)
- •6.2 Gene Therapy and RNA-Based Approaches
- •6.3 Personalized Medicine in Reproductive Disorders
- •7. Therapeutic Applications and Innovations
- •7.1 Infertility and Assisted Reproductive Technologies (ART)
- •7.2 Treatment of Reproductive Cancers
- •7.4 Contraceptive Technologies
- •8. Safety and Regulatory Considerations
- •9. Future Directions and Emerging Trends
- •References
- •1. Introduction
- •2. Liposomes
- •3. Preparation of Liposomes
- •3.1 Reagents
- •3.2 Hydration and Liposome Extrusion
- •3.4 Conjugation
- •3.8 PEGylation
- •3.8.1 Materials Required
- •3.8.2 Procedure
- •3.9 Liposomal Doxorubicin (LD)
- •3.10 Marqibo (Vincristine Sulfate)
- •3.11 DepoCyt (Cytarabine)
- •4. Poly(Lactic-co-Glycolic Acid, PLGA) Nanoparticles
- •4.2 Methods
- •4.2.1 Reagents
- •4.2.2 Procedure
- •5. Polycaprolactone (PCL)
- •5.2 pH Sensitivity and Stability
- •5.3 Methods
- •5.3.1 Materials
- •5.4 Drug Loading
- •6. Chitosan-Based Systems
- •6.1 Encapsulation of Nucleic Acids and Proteins
- •6.3 pH Sensitivity and Stability of Chitosan Nanoparticles
- •6.4 Methodology
- •6.4.1 Reagents
- •6.4.2 Procedure
- •7. Dendrimers
- •7.1 Antisense Oligonucleotides
- •7.2 Small-Interfering RNA (siRNA)
- •7.4.1 Divergent Method
- •7.4.2 Convergent Method
- •8. Challenges in Developing Orphan Drugs
- •References
- •1. Introduction
- •2. Vaccine Delivery Systems
- •3. Polymers
- •4. Non-biodegradable NPs
- •5. Calcium Phosphate NPs
- •6. Colloidally Stable Nanoparticles
- •7. Proteasomes
- •8. Liposomes
- •9. Virus-like Particles (VLPs) and Virosomes
- •10. Immune-Stimulating Complexes ISCOMs
- •11. Emulsion Delivery Systems
- •12. Exosome-Based Vaccine Delivery System
- •13. Immunotherapy Using Nano- and Microparticles
- •14. Properties and Role of Nanoparticles in Drug Delivery
- •15. Biomimicry
- •16. Micellar Systems
- •17. Hydrogels
- •18. Edible Vaccines
- •19. Plant-Derived Viruses
- •20. Melt-in Mouth Strips
- •21. Transdermal Delivery
- •22. Delivery of Nucleic Acids
- •23. mRNA Delivery
- •24. Delivery of Cytokines
- •25. DC Targeting
- •26. Drug Delivery Targeting T Cells
- •27. Conclusions
- •References
- •1. Introduction
- •2. Materials
- •2.1 Equipment
- •2.2 Reagents and Solutions
- •3. Methods
- •3.1 Adenovirus
- •3.3 Retroviral Vectors (RV)
- •3.4 Lentivirus (LV)
- •4. Conclusion
- •References
- •1. Introduction
- •2. Technologies Utilizing Cells in Treating Diseases
- •2.1 Somatic Cell Technologies
- •2.2 Immortalized Cell Lines
- •2.5 Genome Editing Technologies
- •2.6 Cell Plasticity Technologies
- •3. Different Kinds of Cells Are Utilized in the Process of Cell Treatment
- •4. The Practices of Regenerative Medicine and Cell Therapy
- •4.1 Veterinary Medicine Therapeutic Uses
- •5. Advancements and Challenges in Drug Delivery
- •6. Drug Delivery Systems and Applications
- •6.2 Drug Nanocarriers Based on Hyaluronic Acid
- •6.3 Hexagonal Boron Nitride Nanosheet Drug Delivery System
- •6.4 Polymer-Lipid Hybrid Nanoparticles
- •6.6 In Situ Gel Drug Delivery System

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Chapter 18
Drug Delivery in Rare Diseases: Orphan Drugs and Therapies
Anil Kumar, Manjulendra Kumar, and Sudhir Kumar
Abstract
Nanoparticles are one of the innovative drug delivery systems, particularly valuable for the targeted delivery
of orphan drugs in rare diseases. Their nanoscale size and large surface area to volume ratio allow for
enhanced interaction with biological systems, providing a platform for efficient drug loading and controlled
release. Lipid-based nanoparticles, such as liposomes and solid lipid nanoparticles, offer biocompatibility
and stability, ensuring sustained and targeted delivery with minimal toxicity. Polymeric nanoparticles,
including dendrimers, enable the solubilization of hydrophobic drugs and precise control over drug release.
Inorganic nanoparticles, like gold and silica nanoparticles, provide versatility in functionalization and
targeted delivery, enhancing therapeutic efficacy. These systems significantly reduce systemic side effects
and improve the therapeutic index of orphan drugs, the drugs that are used to treat the rare diseases. Their
ability to protect drugs from degradation ensures stability and prolonged activity, making them particularly
suitable for complex and chronic conditions associated with rare diseases. Overall, nanoparticle-based drug
delivery systems represent a transformative approach in the treatment of rare diseases, offering precise,
controlled, and safe delivery of therapeutics, thereby improving patient outcomes and quality of life.
Key words Orphan drug challenges, Liposomal doxorubicin, Antisense oligonucleotides, Smallinterfering RNA delivery
1 Introduction
Rare diseases (RDs) are diseases that affect only a small percentage
of the population. In the United States, the Orphan Drug Act of
1983 defines an RD as one that affects fewer than 200,000 individuals [
specifically to treat these rare diseases, which often lack financial
incentives for pharmaceutical companies due to the limited patient
population. In Europe, a disease is considered rare if it affects no
more than 1 in 2000 people [
definitions, often reflecting the population size and healthcare
policy structures [3]. While each RD affects a limited number of
individuals, collectively, they affect approximately 300 million people worldwide [4]. Over 7000 RDs have been identified, with
1]. Orphan drugs are medications or treatments developed
2]. Japan and Australia have similar
407

408 Anil Kumar et al.
Table 1
Rare diseases, number of global patients, and the cost of treatment
Est. global
Rare disease Orphan drug
patients
Cost (estimated yearly)
Cystic fibrosis Kalydeco/
Ivacaftor
Duchenne muscular dystrophy Exondys
51/Etplirsen
Gaucher disease Zavesca/
Miglustat
Pompe disease Myozyme 10,000+ ~$800,000 (very high)
Hunter syndrome Elaprase/
Idursulfase
Niemann-pick disease type C Zavesca/
Miglustat
Mucopolysaccharidosis type I
(Hurler syndrome)
Spinal muscular atrophy type
1
Aldurazyme/
Laronidase
Spinraza/
Nusinersen
70,000+ ~$300,000
300,000+ ~$700,000 (high variation)
60,000+ ~$200,000 (variable)
1000+ ~$400,000 (extremely
high)
1200+ ~$400,000 (prohibitively
expensive)
1 in 100,000
births
10,000+ ~$750,000 (highest
~$500,000 (extremely
high)
for any
drug)
about 80% having genetic origins [4]. The prevalence of RDs varies
widely; some conditions may affect only a handful of individuals
globally, while others, like cystic fibrosis or Duchenne muscular
dystrophy, have higher incidence rates but still meet the rare disease
criteria [
5].
The small number of patients poses a potential lack of market
incentives, making it difficult for pharmaceutical companies to
recoup their investments (Table 1) [6, 7]. The rarity of Fabry
disease, affecting 1 in 40,000 to 1 in 60,000 males, underscores
the economic challenges in developing new therapies (Table 1) [8–
10]. The high cost of research and development, coupled with the
necessity for extensive clinical trials, exacerbates the financial burden on these companies, making the return on investment uncer-
6, 11–13]. T
tain [
he development of orphan drugs is incentivized
by various regulatory frameworks, such as the Orphan Drug Act in
the United States, which provides benefits including tax credits,
grant funding, and market exclusivity for a certain period [
14]. Sim-
ilar incentives exist in the European Union and other regions to
encourage phar maceutical companies to invest in the research and
development of treatments for rare diseases and orphan drugs [
Various
drugs (Table
drug delivery systems have been developed to deliver
2). A promising approach is the use of viral vectors in
gene therapy, which introduces functional genes to correct genetic
15].
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