Table 2. CA 19-9 level and RFS.

U/mL	Frequency (%)			Cox (univariable)
	Total	No event	Event	HR (95% CI)	p-value
≤ 22.9*	31	12 (38.7)	19 (61.3)	1
> 22.9*	50	9 (18.0)	41 (82.0)	1.50 (0.87–12.60)	0.1454
≤ 37	40	12 (30.0)	28 (70.0)	1
> 37	41	9 (22.0)	32 (78.1)	1.30 (0.78–2.16)	0.3180
≤ 100	56	17 (30.4)	39 (69.6)	1
> 100	25	4 (16.0)	21 (84.0)	1.53 (0.90–2.61)	0.1178
≤ 1000	72	20 (27.8)	52 (72.2)	1
> 1000	9	1 (11.1)	8 (88.9)	2.04 (0.96–4.33)	0.0627

^*The cutoff was determined to maximize the differences between groups in terms of the log-rank test statistic.