Considering that the severity of coronary heart disease is closely related to myocardial enzyme level, we investigated the potential association of NK cell proliferative capability upon stimulation with the level of CK, CK-MB, BNP, cTnI, and LDH in the enrolled 29 CAD patients and 12 HDs (Table 1, Supplementary Table S1). The gene discussed is NPPB; the disease is coronary artery disorder.