Optimal treatment for Siewert type II and III adenocarcinoma of the esophagogastric junction: A retrospective cohort study with long-term follow-up

AIM To determine the optimal treatment strategy for Siewert type II and III adenocarcinoma of the esophagogastric junction. METHODS We retrospectively reviewed the medical records of 83 patients with Siewert type II and III adenocarcinoma of the esophagogastric junction and calculated both an index of estimated benefit from lymph node dissection for each lymph node (LN) station and a lymph node ratio (LNR: ratio of number of positive lymph nodes to the total number of dissected lymph nodes). We used Cox proportional hazard models to clarify independent poor prognostic factors. The median duration of observation was 73 mo. RESULTS Indices of estimated benefit from LN dissection were as follows, in descending order: lymph nodes (LN) along the lesser curvature, 26.5; right paracardial LN, 22.8; left paracardial LN, 11.6; LN along the left gastric artery, 10.6. The 5-year overall survival (OS) rate was 58%. Cox regression analysis revealed that vigorous venous invasion (v2, v3) (HR = 5.99; 95%CI: 1.71-24.90) and LNR of > 0.16 (HR = 4.29, 95%CI: 1.79-10.89) were independent poor prognostic factors for OS. CONCLUSION LN along the lesser curvature, right and left paracardial LN, and LN along the left gastric artery should be dissected in patients with Siewert type II or III adenocarcinoma of the esophagogastric junction. Patients with vigorous venous invasion and LNR of > 0.16 should be treated with aggressive adjuvant chemotherapy to improve survival outcomes.