sentence: By contrast , C ‐ reactive protein ( CRP ) appears to be rather a marker than a causal factor , as its genetic variation does not translate to CAD risk ( Schunkert & Samani , 2008 ; Zacho et al , 2008 ; Elliott et al , 2009 ; C Reactive Protein Coronary Heart Disease Genetics Collaboration ( CCGC ) ( 2011 ) ) .