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Clinical Manifestations.

Steffen Thirstrup1

  • 1European Medicines Agency, Amsterdam, Amsterdam, Netherlands.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 26, 2025
PubMed
Summary

Globally agreed diagnostic criteria facilitate international drug development and regulatory alignment. Discrepancies necessitate trial replication, increasing costs and timelines for new medicines.

Area of Science:

  • Pharmacovigilance and Drug Regulation
  • Clinical Trial Design and Methodology
  • Global Health Policy

Background:

  • Medicinal product approval relies on guidance for safe and effective use, defining the target indication based on benefit:risk profiles.
  • The patient population in clinical trials dictates trial design and conduct, influencing regulatory submissions.
  • Establishing clear target indications is crucial for aligning clinical evidence with regulatory expectations.

Purpose of the Study:

  • To outline the European Medicines Agency's stance on challenges in drug development related to diagnostic criteria.
  • To address the ongoing debate surrounding diagnostic criteria for Alzheimer's Disease.
  • To highlight the impact of diagnostic criteria alignment on global drug development and regulatory processes.

Main Methods:

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  • Review of current European Medicines Agency (EMA) policies and guidelines.
  • Analysis of the implications of diagnostic criteria on global drug development.
  • Examination of regulatory alignment strategies in pharmaceutical development.

Main Results:

  • Globally harmonized diagnostic criteria promote international drug development and regulatory convergence.
  • Lack of standardized criteria may lead to duplicated clinical trials or trials designed to meet varied regulatory demands.
  • Alignment in diagnostic criteria is essential for efficient and cost-effective development of new therapeutics.

Conclusions:

  • The European Medicines Agency emphasizes the importance of standardized diagnostic criteria for efficient drug development.
  • Harmonizing diagnostic criteria, particularly for complex diseases like Alzheimer's Disease, is critical for global regulatory success.
  • Addressing challenges in diagnostic criteria fosters international collaboration and streamlines the approval process for new medicines.