205. MINIMALLY INVASIVE IVOR LEWIS ESOPHAGECTOMY WITH TOTAL MEDIASTINAL LYMPHADENECTOMY FOR THORACIC ESOPHAGEAL CANCER: SHORT- AND LONG-TERM OUTCOMES IN 139 PATIENTS

Abstract Background The McKeown approach is a standard surgery for thoracic esophageal cancer in Japan, as lymph node dissection of upper mediastinum and neck is mandatory. The thoracoscopic approach allows access to the lymph node chain along the laryngeal nerves from the chest and led us to introduce minimally invasive Ivor Lewis esophagectomy (MIILE) with radical lymphadenectomy for middle and lower esophageal cancer. Although circular-stapled anastomosis is popular in MIILE, the frequency of anastomotic complications has been reported to be high. We introduced MIILE with linear-stapled anastomosis in 2010. Methods To evaluate the short- and long-term outcomes of MIILE with radial lymphadenectomy and linear stapled anastomosis, we performed a retrospective cohort study of 139 consecutive patients. The endpoints included overall complications, anastomotic leak rate, nutritional status at 12 months after MIILE, and 5-year overall survival, and disease-free survival. Surgical Procedure After laparoscopic gastric tube construction, thoracoscopic or robotic esophagectomy with total mediastinal lymphadenectomy was done in the prone position. ICG angiography was used to assess gastric tube viability and sacrifice the ischemic portion in recent cases. Esophago-gastric anastomosis was performed using a linear stapler. The opening was closed with interrupted sutures and covered with the omentum to secure the anastomosis. Results There was 122 male and 17 female patients with median age of 69 years. Preoperative diagnosis was stage I/II/III/IV in 44/46/37/12 patients. Pathology results were SCC in 108 cases. Tumor location was middle/lower/EGJ in 58/64/17 patients. Preoperative chemotherapy or CRT was administered in 77 patients. Median thoracic surgery time was 297 minutes and blood loss was 53 mL. Median hospital stay was 17 days. The short-term complication rate of grade IIIa or higher was 8.7%. Anastomotic leak occurred in 8 patients (5.8%), three of whom required intervention. No leakage occurred after introduction of intraoperative ICG angiography. 90-day mortality was 0.7%. With a median follow-up of 41 months, 5-year overall survival rate was 68.3% and disease-free survival rates was 56.7%. For the 65 SCC patients with clinical stage II/III disease, 5-year OS rate was 58.7%. During follow-up period, 2 patients (1.4%) required balloon dilatation due to anastomotic stenosis. At 12 months after MIILE, the mean weight loss was 11.6% and the mean albumin level was 3.9. Discussion Compared to benchmark complication rates reported by the international Esophagectomy Complication Consensus Group (ECCG), the overall complication rate (47% vs. 59%) was not significantly lower, but the anastomotic leak rate was significantly lower (5.8 vs. 11.4%). Overall survival, disease-free survival, and nutritional outcomes were similar to those reported in Japanese clinical trials. Conclusions MIILE with linear-stapled anastomosis is a safe procedure with a low rate of serious complications. Survival and nutritional outcomes were excellent. It may be recommended as a standard procedure for lower and middle esophageal cancer. https://www.dropbox.com/scl/fi/z6zyllnmie9qh3zhz2wd5/Okabe_ISDE.wmv?rlkey=4mig28fv5z2vhaui31tbk0mr9&dl=0