High serum soluble E-selectin levels are associated with postoperative haematogenic recurrence in esophageal squamous cell carcinoma patients.

E-selectin has been reported to be associated with haematogenic metastasis in various cancer patients. In order to evaluate the risk of postoperative haematogenic recurrence of esophageal squamous cell carcinoma (SCC) patients, we examined the preoperative serum levels of soluble E-selectin and clinicopathological data of the patients. Preoperative serum was obtained from 135 esophageal SCC patients who received esophagectomies from 1990 to 1998. Serum soluble E-selectin levels were measured by means of enzyme linked immunoreactive synthesis assay (ELISA). The expression of sialyl Lewis A and X antigens were evaluated in 58 out of 135 patients. Thirty-five patients (25.9%) had haematogenic recurrence in their postoperative course. Serum soluble E-selectin levels of the haematogenic recurrence group (mean 55.6 ng/ml) were significantly higher than those of the non-haematogenic recurrence group (mean 41.1 ng/ml). When the cut-off level of soluble E-selectin was 56 ng/ml, the logistic regression analysis showed that high serum soluble E-selectin levels, lymph node metastasis and intraepithelial spread were associated with postoperative haematogenic recurrence of the esophageal SCC patients (OR 2.99, p=0.047, OR 4.94, p=0.009 and OR 5.0, p=0.019. respectively). Univariate analysis revealed that the patients with a high serum soluble E-selectin level tended to have poor survival (p=0.078) and Cox multivariate analysis revealed that a high serum soluble E-selectin level was a prognostic factor in esophageal SCC patients (RR 1.84, p=0.065). The patients with a high serum soluble E-selectin concomitant with expression of sialyl Lewis antigens had a significant risk of postoperative haematogenic recurrence (p=0.005). These results indicated that preoperative high serum soluble E-selectin was a risk factor in the development of postoperative haematogenic recurrence and was a prognostic factor in esophageal SCC patients.