Clinicopathological Characteristics of Anastomotic Recurrence After Curative Resection for Colorectal Cancer: Comparison With Nonanastomotic Local Recurrences

BACKGROUND:Anastomotic recurrence is thought to be caused by implantation of tumor cells to the anastomotic line; however, its risk factors and prognostic significance remain unclear. OBJECTIVE:This study aimed to clarify the risk factors for anastomotic recurrence in colorectal cancer and assess the prognosis in comparison to nonanastomotic local recurrence. DESIGN:A single-center retrospective observational study. SETTINGS:The medical records of the study participants were retrospectively collected from the Department of Surgical Oncology at the University of Tokyo Hospital database. PATIENTS:This study included 1584 patients with colorectal cancer who underwent surgical resection between January 2005 and December 2017. We focused on 15 patients who had an anastomotic recurrence. MAIN OUTCOME MEASURES:The main outcome measures were the risk factors of anastomotic recurrence at the primary resection and prognosis data in comparison to that of nonanastomotic local recurrence. RESULTS:There were 15 patients (0.95%) with anastomotic recurrence and 35 (2.21%) with nonanastomotic local recurrence. Univariate analysis revealed that lymph node metastasis and advanced T stage are the risk factors for anastomotic recurrence. The prognosis of patients with anastomotic recurrence was similar to that of those with nonanastomotic local recurrence who underwent resection. LIMITATIONS:The small number of patients with anastomotic recurrence is a major limitation of this study. Additionally, the retrospective study design may have increased the risk of selection bias. CONCLUSIONS:Lymph node metastasis and advanced T stage were associated with anastomotic recurrence. The prognosis of patients with anastomotic recurrence was similar to that with resected nonanastomotic local recurrence. Thus, surveillance should be carefully continued while considering the poor prognosis of patients with anastomotic recurrence. See Video Abstract at http://links.lww.com/DCR/C92.