EPCAM and atrial fibrillation: A Cox proportional hazards regression model corroborated these results and demonstrated that patients with H-AF, H-EpCAM, and H-EpCAM/AF were 1.47 (95% CI, 0.6–3.63), 1.8 (95% CI, 0.71–4.57), and 1.38 (95% CI, 0.42–3.63) times more likely to relapse, respectively; however, these ratios were not significant (Table 3).