Fig. 3
OS in patients different level of CTCs and CA19-9. a OS in patients with lower CTC count (CTC < 3/7.5 ml ) had better OS compared these with higher CTC count (CTC ≥ 3/7.5 ml) (15.2 vs 10.2 months, P = 0.023); b OS in patients with lower CA19-9 level (CA19-9 < 200 U/ml) was superior to these with higher CA19-9 level (CA19-9 ≥ 200 U/ml) (14.5 vs 8.4 months, P = 0.007)