EPCAM and atrial fibrillation: In the global sample, high versus low percentage levels of each CSC marker did not show any significant difference in recurrence-free survival (Fig. 5A–C); however, patients with positive LNs and H-CSC percentage levels showed significantly worse PFS with H-AF and H-EpCAM/AF outperforming H-EpCAM alone (Fig. 5D–F).