title: Analysis of Recurrent Cases after Laparoscopic Surgery for Colorectal Cancer.
abstract: OBJECTIVE
  Although previous reports have shown similar recurrence rates and patterns between laparoscopic and open surgery for colorectal cancer, precise data regarding recurrent cases are lacking.
  
  
  METHODS
  From January 2007 to December 2011, 137 Patients with colorectal cancer underwent laparoscopic surgery at our hospital. Of the 137 patients, 7 patients with recurrence were analyzed for oncological factors. Their outcomes were compared with those of 13 patients with recurrence of 160 patients who underwent open surgery for colorectal cancer between January 2005 and December 2006.
  
  
  RESULTS
  In the laparoscopic group, 1 of 37 patients (2.7%) with pathological Stage II (pStage) and 6 of 37 (16.2%) with pStage III experienced recurrence; in the open surgery group, 4 of 56 patients (7.1%) with pStage II and 9 of 63 patients (14.3%) with pStage III experienced recurrence. Although majority of recurrent patterns was distant metastasis, peritoneal metastasis was observed in 2 patients with pT3 tumors in the laparoscopic group. In contrast, all 3 patients with peritoneal recurrence in the open surgery group had pT4 tumors. In the laparoscopic group, 2 patients with peritoneal metastasis were pT3N1M0, and 1 of them revealed peritoneal carcinomatosis 6 months after surgery and developed chylous ascites as a postoperative complication.
  
  
  CONCLUSIONS
  Although the recurrence rates and sites were similar between the laparoscopic and open surgery groups, peritoneal recurrence developed only in patients with pT3 tumors in the laparoscopic group. Exfoliation of tumor cells from divided lymphatic vessels might lead to development of peritoneal recurrence after laparoscopic surgery.
authors.forename: Takeru
authors.initials: T
authors.lastname: Matsuda
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Fujita
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Kunimoto
authors.forename: Taisei
authors.initials: T
authors.lastname: Kimura
authors.forename: Kazunori
authors.initials: K
authors.lastname: Ogino
mesh_terms: D000368:Aged; D003082:Colectomy / Q000009:adverse effects* / Q000379:methods; D015179:Colorectal Neoplasms / Q000473:pathology / Q000601:surgery*; D005260:Female; D006801:Humans; D007564:Japan; D053208:Kaplan-Meier Estimate; D010535:Laparoscopy / Q000009:adverse effects* / Q000379:methods; D008113:Liver Neoplasms / Q000556:secondary*; D008175:Lung Neoplasms / Q000556:secondary*; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D009367:Neoplasm Staging; D010534:Peritoneal Neoplasms / Q000556:secondary*; D012307:Risk Factors; D013997:Time Factors; D016896:Treatment Outcome