{"id":8489,"date":"2011-05-31T16:20:54","date_gmt":"2011-05-31T20:20:54","guid":{"rendered":"http:\/\/blogs.nejm.org\/cardioexchange\/?p=8489"},"modified":"2011-07-19T17:44:24","modified_gmt":"2011-07-19T21:44:24","slug":"biomarkers-dont-believe-the-hype","status":"publish","type":"post","link":"https:\/\/blogs.nejm.org\/cardioexchange\/2011\/05\/31\/biomarkers-dont-believe-the-hype\/","title":{"rendered":"Biomarkers: Don&#8217;t Believe the Hype"},"content":{"rendered":"<p>Watch out for hype when examining the biomarker literature, <a href=\"http:\/\/jama.ama-assn.org\/content\/305\/21\/2200.abstract\">a new  study published in <em>JAMA<\/em><\/a> suggests. John Ioannidis and Orestis  Panagiotou first searched the literature and identified highly cited  studies of biomarkers that included a relative risk calculation of  effect size on a particular outcome. Most of the 35 studies reported cancer- or cardiovascular-related   outcomes. They then performed a second search  to find subsequent meta-analyses on the same biomarker and outcome.<\/p>\n<p>The investigators then compared the effect size of the  first study with the subsequent meta-analyses. For 30 of the 35 studies,  the effect size reported in the largest study included in the  meta-analysis was smaller than the effect size reported in the original  highly cited study. In a comparison of the original study with the  entire meta-analysis, the same pattern was observed, with 29 of the 35  meta-analyses reporting a smaller effect size.<\/p>\n<p>The authors  conclude that before a biomarker is accepted there should be &#8220;extensive  replication and validation of proposed biomarkers in large independent  studies and assessment of their incremental ability.&#8221;<\/p>\n<p>In <a href=\"http:\/\/jama.ama-assn.org\/content\/305\/21\/2229.extract\">an  accompanying editorial<\/a>, Patrick Bossuyt writes that the analysis &#8220;should  convince clinicians and researchers to be careful to match personal  hope with professional skepticism, to apply critical appraisal of study  design and close scrutiny of findings where indicated, and to be aware  of the findings of well-conducted systematic reviews and meta-analyses  when evaluating the evidence on biomarkers.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Watch out for hype when examining the biomarker literature, a new study published in JAMA suggests. John Ioannidis and Orestis Panagiotou first searched the literature and identified highly cited studies of biomarkers that included a relative risk calculation of effect size on a particular outcome. Most of the 35 studies reported cancer- or cardiovascular-related outcomes. [&hellip;]<\/p>\n","protected":false},"author":196,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[686,505],"class_list":["post-8489","post","type-post","status-publish","format-standard","hentry","category-general","tag-biomarkers","tag-meta-analysis"],"_links":{"self":[{"href":"https:\/\/blogs.nejm.org\/cardioexchange\/wp-json\/wp\/v2\/posts\/8489","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.nejm.org\/cardioexchange\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.nejm.org\/cardioexchange\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.nejm.org\/cardioexchange\/wp-json\/wp\/v2\/users\/196"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.nejm.org\/cardioexchange\/wp-json\/wp\/v2\/comments?post=8489"}],"version-history":[{"count":0,"href":"https:\/\/blogs.nejm.org\/cardioexchange\/wp-json\/wp\/v2\/posts\/8489\/revisions"}],"wp:attachment":[{"href":"https:\/\/blogs.nejm.org\/cardioexchange\/wp-json\/wp\/v2\/media?parent=8489"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.nejm.org\/cardioexchange\/wp-json\/wp\/v2\/categories?post=8489"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.nejm.org\/cardioexchange\/wp-json\/wp\/v2\/tags?post=8489"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}