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Dialogues Clin Neurosci. 2002 Dec;4(4):377-87.

Human models as tools in the development of psychotropic drugs.

Dialogues in clinical neuroscience

Christian Gilles, Thérèse Schunck, Gilles Erb, Izzie Jacques Namer, Yann Hodé, Jean-François Nedelec, Peter Boeijinga, Remy Luthringer, Jean-Paul Mâcher

Affiliations

  1. FORENAP, Institute for Research in Neuroscience and Neuropsychiatry, Rouffach, France.

PMID: 22034241 PMCID: PMC3181700

Abstract

Despite the growing means devoted to research and development (R α D) and refinements in the preclinical stages, the efficiency of central nervous system (CMS) drug development is disappointing. Many drugs reach patient studies with an erroneous therapeutic indication andlor in incorrect doses. Apart from the first clinical studies, which are conducted in healthy volunteers and focus only on safety, iolerability, and pharmacokinetics, drug development mostly relies on patient studies. Psychiatric disorders are characterized by heterogeneity and a high rate of comorbidity. It is becoming increasingly difficult to recruit patients for clinical trials and there are many confounding factors in this population, for example, those related to treatments. In order to keep patient exposure and financial expenditure to a minimum, it is important to avoid ill-designed and inconclusive studies. This risk could be minimized by gathering pharmacodynamic data earlier in development and considering that the goal of a phase 1 plan is to reach patient studies with clear ideas about the compound's pharmacodynamic profile, its efficacy in the putative indication (proof of concept), and pharmacokinetic/pharmacodynamic relationships, in addition to safety, tolerability, and pharmacokinetics. Human models in healthy volunteers may be useful tools for this purpose, but their use necessitates a global adaptation of the phase scheme, favoring pharmacodynamic assessments without neglecting safety. We are engaged in an R α D program aimed to adapt existing models and develop new paradigms suitable for early proof of concept substantiation.

Keywords: Alzheimer's disease; anxiety; depression; drug development; healthy volunteer; model; proof of concept; schizophrenia

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