Post hoc comparisons with corrections for multiple comparisons and adjustment for confounding factors revealed that cell surface FPR1 protein expressions on neutrophil were significantly increased in the treatment-naive OSA (7.24±3.2 MFI; p = 0.009/adjusted p = 0.001 vs. HS; p = 0.009/adjusted p = 0.005 vs. PS) and severe OSA on CPAP (8.72±5.07 MFI; p = 0.001/adjusted p = 0.007 vs. HS; p = 0.001/adjusted p = 0.005 vs. PS) groups as compared with that in the HS (4.12±0.96 MFI) and PS (4.11±1.66 MFI) groups, respectively (Fig 2A). This evidence concerns the gene FPR1 and obstructive sleep apnea syndrome.