B2M and coronary artery disorder: The correlation of B2M levels and prevalence of CAD was further confirmed in all four quartiles of B2M levels (CAD prevalence in B2M quartiles: 68.1% vs 75.7% vs 79.1% vs 86.1%, OR (95%CI) =1.432 (1.288–1.602), p < 0.001, Fig. 2a, Table 2).