4.

Multivariate analyses of factors associated with RFS in ypT0 patients

Factors	Total	HR	95% CI	P
RFS, recurrence-free survival; CEA, carcinoembryonic antigen; BT, blood transfusion; HR, hazard ratio; 95% CI, 95% confidence interval.
CEA (ng/mL)				0.088
≤5	40	1
>5	19	3.41	0.83–13.95
ypN category				0.009
N–	51	1
N+	8	10.15	1.76–58.41
Perioperative BT				0.001
No	49	1
Yes	10	11.77	2.78–49.90