Abstracts of the NIH-FDA Conference 188
ForewordWelcome to the NIH-FDA Conference, "Biomarkers and Surrogate Endpoints: Advancing Clinical Research and Applications". The current era of scientific discovery, including genomics, molecular medicine, and technological innovation, presents the research community with myriad prospective targets for developing powerful and effective therapies for many diseases and disorders. The prospect of an abundance of new therapies, however, poses new challenges to the scientific evaluation process that determines the efficacy and safety of these candidate therapies. Improving the efficiency of clinical trials is a critically important public health issue that all facets of the clinical trials enterprise must address to fully realize the potential for cures.The challenge to conference participants is to couple the growing understanding of pathogenesis with tools from the laboratory to develop more precise and accurate measures of disease in patients. The discovery of novel measures of biological factors, or biomarkers, that reflect the clinical response in disease offers the potential to streamline therapeutic development. Adaptation of these biomarkers as substitutes for clinical endpoints, or surrogate endpoints, in clinical trials has taken on new importance in light of the opportunities now before us. We hope this conference will chart a course of scientific discovery that unites the research community to achieve a common goal -enhancement of the abilities to measure disease and response to novel therapies in patients.
Biomarkers and Surrogate Endpoints
189Plenary Session 1
Historical Perspectives
Abstracts of the NIH-FDA Conference 190
Biomarkers as Surrogate Endpoints in Clinical Trials for HIV/AIDS: A Model for Other Diseases?Donna Mildvan, M.D. and Jonathan M. Kagan, Ph.D.
Division of Infectious Diseases, Beth Israel Medical Center, and Division of AIDS, National Institute of Allergy and Infectious Diseases, National Institutes of Health, USAIn the earliest days of the HIV/AIDS epidemic, the lack of sensitive biomarkers as near-term indicators of active therapy necessitated large clinical trials using mortality and AIDS progression as endpoints. This changed with the advent of molecular tools for the detection and quantitation of circulating HIV-1 RNA in all infected individuals. HIV-1 RNA and CD4 (the end organ for HIV attack) have been shown to predict clinical outcome in untreated patients and respond to active antiretroviral intervention. Together, these markers account for a significant proportion of the clinical benefit mediated by effective therapy. Collectively, these findings have permitted accelerated development and approval for HIV therapies, which have dramatically affected the epidemic in developed nations. However, despite these successes, these markers are incomplete in that they (1) only partially explain the clinical benefit of antiretroviral therapy; (2) have been observed to display discordant, hence uninterpretable, responses; and (3) have not been va...