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IJE Advance Access originally published online on March 15, 2006
International Journal of Epidemiology 2006 35(3):572-578; doi:10.1093/ije/dyl003
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Published by Oxford University Press on behalf of the International Epidemiological Association © The Author 2006; all rights reserved.

Commentary

Commentary: Grading the credibility of molecular evidence for complex diseases

John P A Ioannidis

Department of Hygiene and Epidemiology, University of Ioannina School of Medicine, Ioannina 45110, Greece E-mail: jioannid@cc.uoi.gr

Keywords Epidemiology, evidence, grading, bias, false discovery, complex diseases, Bayesian credibility

Accepted 11 August 2005

The first 150 words of the full text of this article appear below.

Dissecting the aetiology of complex diseases has been a great challenge for biomedical research, including epidemiology. Several thinkers,1–4 including Buchanan et al.5 recently, have focused on the unquestionable difficulties of this ambitious enterprise and the great obstacles encountered in the way. Some of them have ended up with a futility outlook. Over more than a decade, the debate has ranged wild on whether epidemiology has reached its limits,6 is either dead or in a vegetative state, should call it a day, and whether ‘it is time for scientists to re-think the quest’ and realize that ‘base metal cannot be turned to gold’.5

In this commentary, I will not argue whether the challenges for attaining evidence are formidable in the current, molecular era. I will certainly not propose that the ‘hunger of the paying public for easy answers and promises’5 should be superficially satisfied. However, I will argue that not . . . [Full Text of this Article]


    Scientific prehistory (stone age until approximately early 21st century?)
 

    Are ‘macroscopic’ risk factors defendable?
 

    Is epidemiology a match for biology and aetiology?
 

    A flood of candidate risk factors
 

    Solid knowledge vs tentative information
 

    Grading of molecular evidence
 

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