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The aim of the present study was to clarify the therapeutic effect of thoracoscopic esophagectomy with radical lymph node dissection based on the recurrence pattern, and identify the risk factors for relapse-free survival in patients with esophageal cancer. The recurrence patterns in 140 patients who underwent complete thoracoscopic radical esophagectomy between January 2003 and December 2012 were investigated. The risk factors for recurrence were examined by univariate and multivariate analysis. Mediastinal recurrence in association with initial lymphatic metastasis was precisely analyzed. Esophageal cancer recurred in 49 (35.0%) of the 140 patients. The median recurrence time was 259 (45-2,560) days after the initial treatment. The patterns of initial recurrence among the 140 patients included hematological recurrence in 24 patients (17.1%), lymphatic recurrence in 26 (18.6%), pleural dissemination in 5 (3.6%), peritoneal dissemination in 2 (1.4%), and local recurrence in 4 (2.9%). Lymphatic recurrence within the mediastinal regional lymphatic stations occurred in only 8 (5.7%) of the 140 patients. Univariate analysis for relapse-free survival showed that the statistically significant variables were a tumor location in the upper third of the esophagus, stage of pT3 or pT4, presence of nodal metastasis, pStage of III or IV, presence of a residual tumor, performance of preoperative chemotherapy and performance of postoperative therapy. Multivariate analysis showed that only nodal metastasis and a positive residual tumor were statistically significant independent risk factors for relapse-free survival. Lymphatic recurrence within the mediastinum, particularly the station around the bilateral recurrent laryngeal nerves, was infrequent and independent of the initial metastatic distribution. Thoracoscopic esophagectomy with radical lymph node dissection provides favorable locoregional control. Lymphatic recurrence within the mediastinal regional nodes is infrequent and independent of the initial lymph node metastasis. A pathological residual tumor and lymph node metastasis are significant risk factors for recurrence.

molecular and clinical oncology

Recurrence patterns and risk factors following thoracoscopic esophagectomy with radical lymph node dissection for thoracic esophageal squamous cell carcinoma