Abstract

Advanced therapy medicinal products (ATMPs) have a massive potential to address existing unmet medical needs. Specifically, gene therapy medicinal products (GTMPs) may potentially provide cure for several genetic diseases. In Europe, the ATMP regulation was fully implemented in 2009 and, at this point, the Committee for Advanced Therapies was created as a dedicated group of specialists to evaluate medicinal products requiring specific expertise in this area. To date, there are three authorized GTMPs, and the first one was approved in 2012. Broad research has been conducted in this field over the last few decades and different clinical applications are being investigated worldwide, using different strategies that range from direct gene replacement or addition to more complex pathways such as specific gene editing or RNA targeting. Important safety risks, limited efficacy, manufacturing hurdles, or ethical conflicts may represent challenges in the success of a candidate GTMP. During the development process, it is fundamental to take such aspects into account and establish overcoming strategies. This article reviews the current European legal framework of ATMPs, provides an overview of the clinical applications for approved and investigational GTMPs, and discusses critical challenges in the development of GTMPs.

Highlights

  • Advanced therapy medicinal products (ATMPs) represent a major class of innovative therapies that differ substantially from traditional therapeutic agents

  • The ATMP concept was first introduced in 2003 through Directive 2003/63/EC where ATMPs were defined as products “based on manufacturing processes focused on various gene transfer produced bio-molecules, and/or biologically advanced therapeutic modified cells as active substances or part of active substances” [4]

  • The results showed that artificial induction of HIV resistance was a generally safe and feasible approach [95]

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Summary

Frontiers in Medicine

Advanced therapy medicinal products (ATMPs) have a massive potential to address existing unmet medical needs. Gene therapy medicinal products (GTMPs) may potentially provide cure for several genetic diseases. In Europe, the ATMP regulation was fully implemented in 2009 and, at this point, the Committee for Advanced Therapies was created as a dedicated group of specialists to evaluate medicinal products requiring specific expertise in this area. Broad research has been conducted in this field over the last few decades and different clinical applications are being investigated worldwide, using different strategies that range from direct gene replacement or addition to more complex pathways such as specific gene editing or RNA targeting. This article reviews the current European legal framework of ATMPs, provides an overview of the clinical applications for approved and investigational GTMPs, and discusses critical challenges in the development of GTMPs

INTRODUCTION
Gene Therapy Landscape in Europe
EUROPEAN REGULATORY BACKGROUND
GENE THERAPY MEDICINAL PRODUCTS
First Steps in Gene Therapy
Gene Delivery Vectors
Advanced therapy medicinal product examples
Monogenic Diseases
Multifactorial Diseases
Targeted Gene Editing
The Challenges
Safety Issues
Efficacy Issues
Findings
CONCLUSION

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