PTGER3 and asthma: Finally, in the asthma vs. HC comparison, 9 SNPs were identified, with 2 associated with risk in the MS4A2 gene (rs573790 p = 0.001, OR = 1.70, CI 95% = 1.21-2.37), and 7 SNPs associated with protection in 4 genes (TBXAS1, FANCC, CYSLTR2, and PTGER3) (Table 4).