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Invited Commentary: Can You Do Trials of Behavioral Modification, Such as Diet or Exercise Intervention, With Hard

Lewis H Kuller

    American Journal of Epidemiology
    |November 13, 2019
    PubMed
    Summary

    The Multiple Risk Factor Intervention Trial failed due to its design and bureaucracy. This highlights challenges in large clinical trials for diet-related diseases and public health recommendations.

    Keywords:
    JUMBOMRFITcholesterolclinical trialsdiet

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    Area of Science:

    • Epidemiology
    • Public Health
    • Clinical Trial Design

    Background:

    • The Makarska Conference in 1968 influenced the planning of major cardiovascular intervention trials.
    • The National Institutes of Health (NIH) initiated the Multiple Risk Factor Intervention Trial (MRFIT).
    • MRFIT aimed to reduce coronary heart disease (CHD) and total mortality through risk factor intervention.

    Purpose of the Study:

    • To analyze the reasons for the failure of the Multiple Risk Factor Intervention Trial (MRFIT) to demonstrate significant reductions in CHD or total mortality.
    • To discuss the ongoing relevance of issues related to the design and oversight of large, multi-center clinical trials.
    • To examine the challenges in evaluating behavioral interventions for diet-related diseases within complex public health contexts.

    Main Methods:

    • Historical analysis of the evolution from the Makarska Conference to the MRFIT.
    • Critical review of MRFIT's trial design, multi-center approach, and bureaucratic factors.
    • Discussion of the interplay between different study types (observational, animal, genetic) and clinical trials for public health recommendations.

    Main Results:

    • The MRFIT trial's lack of significant mortality reduction was attributed to its design, multiple centers, and bureaucracy.
    • The paper raises critical questions about NIH staff involvement in external large-scale studies.
    • Challenges in using individual randomization for common-source epidemics like diet and CHD were highlighted.

    Conclusions:

    • The effectiveness of large, multi-center clinical trials, particularly for behavioral interventions, requires careful consideration of design and oversight.
    • Integrating evidence from diverse study types is crucial but complex for developing robust public health guidelines.
    • The evaluation of public health interventions necessitates clear measures of success beyond traditional clinical trial endpoints.