Moreover, asthma subjects had higher platelet factor 4 (PF4) (146.2 [144–148.3] vs. 97 [94.28–99.72] ng/ml, p < 0.0001), as well as raised α2-macroglobulin levels (15.07 [14.43–15.71] vs. 12.7 [12.1–13.3] nmol/l, p = 0.0002). This evidence concerns the gene PF4 and asthma.