Detection of Significant Coronary Artery Disease by Promising Biomarker: A2A Adenosine Receptor (A2AR) Assays

Transversal, national, multi-center study with progressive recruitment designed to assess the diagnostic accuracy of A2AR expression for the identification of significant obstructive CAD (FFR\<0.8) of patients suspected of CCS compared to the gold standard. 1. To assess the diagnostic accuracy of the A2AR profile (i.e. KD/EC50) for identifying myocardial ischemia in patients with suspected CCS compared to the gold standard inducible myocardial ischemia. 2. To determine the best threshold value for A2AR expression for identifying significant obstructive CAD (FFR\<0,8) in patients with CCS, and to estimate the diagnostic performances associated with the identified threshold 3. To determine the best threshold value for A2AR profile (i.e. KD/EC50) for identifying myocardial ischemia (See annex 2) in patients with CCS and to estimate the diagnostic performances associated with the identified threshold.