MMP8 and atrial fibrillation: In line with these studies, we combined quantitative cervical length with multiple AF proteins (CXCL8, MMP8, PTPN11, and SNAP25) and found a significant improvement in the AUC (AUC = 0.93 for the combined markers vs. AUC = 0.74 for cervical length alone, p = 0.006).